Showing papers on "Feed line published in 2017"

Low-Profile Dual-Band Filtering Patch Antenna and Its Application to LTE MIMO System

Abstract: This paper presents a low-profile dual-band filtering antenna element and its application to long-term evolution (LTE) multiple-input multiple-output (MIMO) system for wireless customer premise equipments (CPEs). The proposed element consists of two separate U-shaped patches operating at different frequencies and a multistub microstrip feed line. For size miniaturization, the smaller U-shaped patch is embedded in the larger one. In addition, the multistub feed line can generate two controllable resonant modes as well as two nulls in realized gain at the boresight direction. Since the modes of the patches and multistub feed line can be controlled individually, the two operating bands can be tuned to desired frequencies. Also, the radiation nulls in boresight gain can be controlled, high roll-off rate and out-of-band radiation rejection levels are thus obtained. For demonstration, a low profile ( $0.009\lambda _{0})$ dual-band filtering antenna element operating at 1.9 and 2.6 GHz for TD-LTE applications (B39- and B38-bands) is implemented. Dual-band bandpass responses and four radiation nulls are observed in the experiment. Measured in-band gains are 6.7 and 7.3 dBi, whereas out-of-band gains are less than −10 dBi. Based on this element, a four-element MIMO antenna is further designed for LTE CPEs, where low profile and high integration of multiple components are required. A low mutual coupling of less than −19.2 dB and the low envelope correlation coefficients of better than 0.2 are obtained with a small edge-to-edge spacing of $0.15\lambda _{0}$ .

Frequency- and time-domain analysis of a novel UWB reconfigurable microstrip slot antenna with switchable notched bands

Abstract: A novel reconfigurable microstrip slot antenna with capability of switchable frequency notched bands for ultra-wide-band (UWB) applications is presented. The feed line is tapered to provide UWB matching condition. Two parasitic elements are attached to two sides of patch having a square slot for improvement of frequency band response. An inverted Γ-shaped parasitic element is placed inside the slot in patch to produce a notch at wireless local area network (WLAN) frequency band (5.1–5.7 GHz). A rectangular split ring resonator is placed on the back side of microstrip slot antenna to produce a notch at downlink X-band for satellite communication systems (7.2–7.8 GHz). Reconfigurability of proposed antenna is obtained by placing PIN diodes at appropriate places to achieve four different operations, namely UWB coverage, UWB coverage with single band notch at WLAN, UWB coverage with single band notch at downlink X-band and UWB coverage with double band notch at WLAN and downlink X-band. The first case achieves fractional bandwidth of 123% (3.1–13 GHz). Antenna performance is studied in frequency and time domains. The bias circuits of PIN diodes are placed on antenna structure and are considered in simulations. A prototype model of proposed antenna is fabricated and measured to demonstrate its desirable features.

3-D Printed Air Substrates for the Design and Fabrication of RF Components

Abstract: This paper presents the fabrication and characterization of radio frequency (RF) and microwave passive structures on an air substrate using additive manufacturing (3-D printing). The air substrate is realized by 3-D printing RF structures in two separate pieces and snapped together face to face using a LEGO-like process. Spacers printed on the periphery provide the desired air substrate thickness. Metal patterning on nonplanar printed plastic structures is carried out using a damascene-like process. Various RF structures such as low dispersion transmission line, T-line resonator, high-gain patch antenna, slot antenna, and cavity resonator are demonstrated using this process. Good performance is achieved; for example, measured 50- $\Omega $ transmission line shows low loss of 0.17 dB/cm at 4 GHz, and a patch antenna (center frequency of 4.5 GHz) shows gain and bandwidth of 7.6 dB and 0.2 GHz, respectively. Details of both measured and simulation results are presented.

Diced and grounded broadband bow-tie antenna with tuning stub for resonant tunnelling diode terahertz oscillators

Abstract: Radiation from antennas integrated with indium phosphide (InP)-based resonant tunnelling diode (RTD) oscillators is mainly through the substrate because of the effects of the large dielectric constant. Therefore, hemispherical lenses are used to extract the signal from the backside of the substrate. In this study the authors present a broadband bow-tie slot antenna with a tuning stub which is diced and mounted on a ground plane to alleviate the substrate effects. Here, the large dielectric constant substrate around the antenna conductor is removed. In addition, the ground plane underneath the diced substrate acts as a reflector and, ultimately, the antenna radiates to the air-side direction. Antenna integration with RTD oscillators is described in this study as well. Two-port bow-tie slot antennas were designed and characterised and showed the suitability of integration with power combining RTD oscillator circuits which are based on mutual coupling. The antennas were fabricated using electron beam lithography on a semi-insulating InP substrate. Simulated and measured bandwidth almost extends the entire frequency range 230–325 GHz. Simulations shows air-side radiation pattern and antenna gain of around 11 dB at 280 GHz. Simulations also show that the antenna may be fed with a 50-Ω or 30-Ω feed line, i.e. suitable feed lines, without compromising its performance which may prove beneficial for optimum loading of RTD oscillators.

A Minimally Invasive Coax-Fed Microwave Ablation Antenna With a Tapered Balun

Abstract: We present a minimally invasive coax-fed dipole antenna with a tapered slot balun for microwave ablation (MWA) applications. The balun is created by gradually tapering the outer conductor of the coaxial feed line into two parallel strips, leaving two tapered slots on the outer conductor. Implementing the balun within the outer conductor of the coax itself helps reduce the overall diameter of the antenna compared to interstitial antennas that use conventional coaxial baluns. The tapered-slot balun connects the dipole antenna comprised of three active segments to the coaxial feed line. One active segment is defined by an extension of the inner conductor of the coaxial cable, acting as one arm of the dipole. The other two active segments are located in the two slots created by tapering the outer conductor and connected to its distal end to constitute the second arm of the dipole. We designed the antenna to operate at 6 GHz in ex vivo bovine liver and fabricated a prototype to conduct ablation experiments. Simulation and experiment results show that the tapered balun provides good impedance matching between the coaxial feed line and the dipole and helps the antenna achieve localized ablation zones. The proposed antenna offers a promising solution for reducing the overall diameter, and the invasiveness, of coax-fed interstitial antennas used for MWA.

Super wideband antenna with single band suppression

Abstract: In this paper, a band-notched compact printed monopole super wideband (SWB) antenna has been designed and fabricated. The SWB antenna composed of a radiating patch with a 50 Ω triangular tapered feed line which is connected through a feed region, and a chamfered ground plane (CGP), that covers the frequency band from 0.9–100 GHz (ratio bandwidth of 111.1:1) with a reflection coefficient |S11| < −10 dB, except in the notched band of 4.7–6 GHz for Wireless local area network IEEE 802.11a and HIPERLAN/2 WLAN band. To realize the band notch characteristics a C-shape parasitic element is employed near the CGP etched with two symmetrical L-slots and placed under the radiating patch. Proposed antenna structure occupies a relatively small space (30 × 40 × 0.787 mm3) and achieved much wider impedance bandwidth as well as higher gain compared with the existing ultra wideband and SWB antennas.

A Wideband CP Crossed Slot Antenna Using 1- $\lambda $ Resonant Mode With Single Feeding

Abstract: This communication proposes to use the 1- $\lambda $ resonant mode of slot radiator with single feeding for bandwidth enhancement. The impedance of a simple slot radiator is studied using computer simulation. Since operating the slot radiator in the 1- $\lambda $ resonant mode requires a longer slot length, a large square slot is used at both ends of the slot to reduce the required slot length. The results of the study are subsequently used to design a wideband circularly polarized (CP) crossed slot antenna (CSA) with single feeding. The CSA consists of two slot radiators having the same length and placed in a crossed shape, i.e., orthogonal positions. A single microstrip line with a via at the end is used to feed the CSA. By loading reactive elements with appropriate values on each slot near to the feed line, the two slots generate two linearly polarized electric fields with 90°-phase difference for CP operation. The CSA is studied and designed using simulation and measurement. Measured results show that the CSA has a wide impedance bandwidth of 1.52–3.44 GHz (1.92 GHz, 77.4%) and axial-ratio bandwidth of 1.73–3.01 GHz (1.28 GHz, 54%), much wider than the previous directional and bidirectional CSAs using single feeding.

Millimeter-Wave Substrate Integrated Dual Level Gap Waveguide Horn Antenna

Abstract: Substrate integrated H-plane horn antenna design is introduced based on elevated substrate integrated gap waveguide (E-SIGW) configuration. The E-SIGW topology allows designing the horn from two substrates of different thicknesses. A thin substrate for the feed line to eliminate the radiation losses and a thicker one for the radiating aperture. The proposed configuration allows the H-plane horn aperture to be three times thicker than the feed line substrate, which is not possible with the conventional substrate integrated waveguide technology. The transition between the horn layers enhances the matching bandwidth without any aperture modification. The outer surface of the horn around its aperture is loaded with soft surfaces realized by transverse strips. As a result, more symmetric fan beam radiation patterns with suppressed back lobes are achieved.

Multiband microstrip patch antenna for 5G wireless applications using MIMO techniques

Abstract: A Multiple Input Multiple Output (MIMO) 4-antenna linear array operating at 28 GHz, 37GHz, 41 GHz and 74 GHz bands for 5G mobile communication is presented. The antenna is designed based on the resonant cavity model and the dominant mode of (0,1,1) which has maximum field distribution TE 011 which has maximum field distribution TE011 at the edge of the patch. Multiband operation is achieved by introducing slits and slot on the patch were the magnetic field is maximum when the patch is considered as resonant cavity. The antenna is fed by Microstrip Transmission line and impedance matching between patch and feed line is achieved through inset feed techniques. The 4-antennas are placed based on the spatial diversity in the spacing of λ/2. The MIMO-antenna system is designed and simulated using Ansoft HFSS and the multiple antennas are resonating at designed frequency bands.

Waveguide-Stripline Series–Corporate Hybrid Feed Technique for Dual-Polarized Antenna Array Applications

Abstract: This paper proposes a waveguide-stripline series–corporate hybrid feed technique to ease the feed-network design for dual-polarized antenna arrays. The hybrid feed network consists of a stripline series feed network and a waveguide-stripline corporate feed network, incorporating both of their advantages in one application. Furthermore, the design can efficiently simplify the manufacturing and packaging process without any bonding postprocess. The proposed technique is realized on an $8 \times 8$ dual-polarized antenna array, and the expected performances are verified by measurement. Experimental results show that the antenna array can operate in a wide bandwidth of 13.2% with more than 40 dB isolation for dual polarization. Cross polarizations at the center frequency of 15.2 GHz are below −27 dB, and the achievable aperture efficiency is 80% for both the polarizations. This hybrid feed approach can be considered as a promising solution for efficient feed-network applications.

An X-shaped fractal antenna with DGS for multiband applications

Abstract: In this paper, an X-shaped fractal antenna with defected ground structure (DGS) is presented for multiband and wideband applications. The X shape is used due to its simple design and DGS is utilized to achieve size reduction with multiband and wideband features in the frequency range of 1–7 GHz. The proposed structure is fabricated on FR4 substrate with 1.6 mm thickness. We have proposed two different antennas both are having X-shaped fractal patch with a slotted ground plane to have more impedance bandwidth and better return loss. Various parameters like scale factor, width of ground plane, number of slots with their dimensions and feed line length are optimized to have size reduction and for enhancing the performance of antenna. Reflection coefficient shows the multiband and wideband features of proposed antenna. One of the proposed antennas covers various applications like IEEE802.11y at 3.65 and 4.9 GHz, IEEE 802.11a at 5.4 GHz, 802.11P at 5.9 GHz. Other antenna covers applications like IEEE802.16 at 3.5 GHz; 5 cm band for amateur radio and satellite and future 5 G communication systems over 6 GHz. The antenna designing was done using CST software and simulation results were compared with experimental results (using E5071C network analyzer).

Analysis and design of a triple band metamaterial simplified CRLH cells loaded monopole antenna

Abstract: The design and analysis of meta-material inspired loaded monopole antenna for multiband operation are reported. The proposed antenna consists of multi resonators inspired from half mode composite right/left handed cells, which has a simple structure, compact size, and provides multiband functionalities. As a proof of concept, a triple band antenna covering all possible WiMAX operating bands, has been designed, fabricated, and characterized. The hosting monopole patch itself generates resonance for 3.3–3.8 GHz band, whereas the loaded metamaterial cells add extra resonance frequencies. The loading of two resonator cells introduces two extra resonances for 2.5–2.7 GHz and 5.3–5.9 GHz bands, respectively. The antenna's operating principle and design procedures with the aid of electromagnetic full wave simulation and experimental measurements are presented. The antenna has good omnidirectional patterns at all three bands. The monopole patch size is 13.5 × 6.5 mm2 and the whole antenna size (including the feed line) is 35 × 32 mm2. Compared with conventional single band microstrip patch radiator, the radiator size of this antenna is only 8.5% at 2.5 GHz, 17% at 3.5 GHz, and 37% at 5.5 GHz.

Series Feed Networks for Dual-Polarized Frequency Scanning Phased Array Antenna Based on Composite Right/Left-Handed Transmission Line

Abstract: In this paper, series feed networks based on composite right/left-handed transmission line for dual-polarized frequency scanning phased array antenna are presented. The proposed all-passive feed networks provide unique frequency dispersion and adjustable current amplitude distribution, which enable continuous backward-to-forward beam scanning capability as well as the directivity, beamwidth, and sidelobe level controllability of the incorporated array antenna. The working mechanisms are demonstrated through broadband dual-polarized aperture-coupled antenna elements and series feed networks that support uniform/binomial current amplitude distributions. Backward-to-forward frequency beam scanning and wide range beam shaping capability for dual-polarization states of the proposed phased array are validated in both simulation and measurement.

Microstrip antenna miniaturization with fractal EBG and SRR loads for linear and circular polarizations

Abstract: In this paper, combination of electromagnetic band gap (EBG) and split-ring resonator (SRR) loads with fractal formation for miniaturization of microstrip antenna is noticed. Here two different shapes of antenna have been studied with two well-known metamaterial structures as parasitic elements. A conventional microstrip antenna, which is surrounded by four EBG unit cells, is chosen as the first antenna. It has an effective resonance at 2.5. The Minkowski fractal method is applied to EBG unit cells in this stage. The Minkowski fractal structure is implemented for accession of effective capacitance in EBG unit cells. The second antenna frequencies are 2.5 and 5.9 GHz. It contains a slot structure with four SRRs, used for making parasitic elements and for achieving multi-band characteristic. The fractal method is used to improve the inductance of SRR structure by increasing the effective length of microstrip line. At this stage, the applied fractal structure has been modified, so that the frequency of wireless application could be achieved. In the last step, by some changes in feed line of the slot antenna, circular polarization (CP) is obtained for the second antenna, which shows that SRR load can be helpful for making the CP.

Structure and EM-driven design of novel compact UWB slot antenna

Abstract: In this study, a structure and design optimisation procedure of a novel compact ultra-wideband (UWB) slot antenna has been presented. In order to achieve small size of the structure and maintain acceptable electrical performance, a sufficiently large number of geometry parameters have been introduced. These include a stepped-impedance feed line and a meandered slot with all of dimensions being parameterised and subject to optimisation. All parameters are simultaneously adjusted using automated electromagnetic (EM)-simulation-driven optimisation algorithm. The design process is oriented towards explicit size reduction of the antenna structure. Penalty function approach is utilised to control the reflection response. In order to reduce the computational cost of the optimisation process, variable-fidelity EM models are utilised. The footprint of the optimised antenna is only 8.93 × 17.9 mm (160 mm2) while maintaining reflection below the –10 dB threshold in the entire UWB frequency range. The antenna has been favourably compared with the state-of-the-art compact structures in terms of the size. The obtained numerical results are supported by measurements of the fabricated antenna prototype.

Planar UWB integrated with multi narrowband cylindrical dielectric resonator antenna for cognitive radio application

Abstract: A planar Ultrawideband (UWB) integrated with multi narrowband cylindrical dielectric resonator antenna (CDRA) for cognitive radio (CR) application is addressed. In this communication the proposed design is composed of two different antennas with different feeding mechanisms. The first one is a modified planar hexagon (combination of hexagon with rectangular patch) as UWB radiator excited by coplanar waveguide (CPW) feed and the second represents a CDRA, behaving as narrowband radiator, excited by a slot coupled micro strip feed line. The UWB antenna ranges from 3.0 GHz to 12 GHz and the narrow band (NB) CDRA operating at three different resonance frequencies ranges from 5.1 GHz (4.93–5.4) GHz, 6.3 GHz (5.9–6.7) GHz and 9.76 GHz (9.28–10.2) GHz respectively with reasonable isolation between them. The proposed design is quite fit for CR application where the UWB radiator is used for spectrum sensing and narrow band antenna for the sake of communication. In addition, the proposed antenna can be potentially used for WiMAX, C-band and X-band satellite link in first, second and third communication band respectively. The optimized antenna as a prototype was fabricated and all its relevant parameters were measured. The comparative results (simulation and measurement) reveal a good agreement.

A compact planar CPW fed monopole antenna for Ultra Wideband applications

Abstract: A compact $(25\text{mm}\times 15\text{mm}\times 0.8\text{mm})$ co-planar waveguide fed monopole UWB antenna with transitions in feed line is proposed in this article. A good agreement is found in between simulated and measured results of the proposed design. The antenna provides a wide bandwidth from 4.5GHz to 11GHz with high average efficiency of 78%, flat gain variation of 2-4.5dBi and minimal group delay variation. The antenna pattern is omnidirectional in H-plane and monopole like in E-plane. The proposed simple structured antenna is easy for fabrication and integration to PCB board.

Miniaturized Minkowski-Island Fractal Microstrip Antenna Fed by Proximity Coupling for Wireless Fidelity Application

Abstract: This paper proposed a new design of Minkowski Island microstrip antenna fed by proximity coupling with partial ground plane. The design was consisted of two layers of substrate, on the top substrate was the antenna patch and on the bottom substrate was the proximity feed line and the partial ground. At the first stage, the normal square patch antenna was mainly designed. Then, the Minkowski patch antenna was designed using 1st iteration technique and 2nd iteration technique. The Minkowski fractal shape slot was embedded in the center of the patch to form a Minkowski Island patch antenna. Using the Minkowski Island fractal technique, the dimension of the patch can be reduced up to 58.7%. The proximity feed line in this design was used to increase the impedance bandwidth, and from the measurement the impedance bandwidth of the proposed antenna was 240 MHz with return loss of -24.54 dB and VSWR of 1.126.

Real Time Analysis of a 24 GHz Planar Microstrip Antenna for Vehicular Communications

Abstract: A single patch antenna suitable for integration and operation in 24 GHz band for wireless inter vehicular communication is designed and developed The requirements on the design are the large bandwidth, simple configuration, light weight and low profile The antenna is fed by using inset feed line to provide impedance matching Antenna gain values of ∼59 dBi are obtained in addition to a very less return loss of ~39 dB The developed antenna provides a bandwidth of 120 MHz and an input impedance of ~50Ω The antenna was tested in a real time environment and the received power levels are noted A simple Rician channel is simulated for the measured values and the BER is tabulated

Dual-band C-shaped circular slot SIW antenna

Abstract: Dual-band C-shaped circular slot substrate integrated waveguide (SIW) antennas are proposed in this paper. The C-shaped structure is constructed using slot region oriented along the longitudinal as well as the transversal directions to feed line. A C-shaped circular slot SIW antenna is designed and fabricated to achieve larger bandwidth, higher gain and low cross polarization level. The designed C-shaped circular slot SIW antenna produces dual band measured response in the frequency range of 11.05 GHz to 11.30 GHz and 12.80 GHz to 13.30 GHz, with the center frequencies of 11.19 GHz, and 13.06 GHz, respectively. At these center frequencies measured gain is 8.81 dBi and 8.70 dBi, respectively.

A monopole super wideband microstrip antenna with band-notch rejection

Abstract: A novel of monopole antenna withband-notched rejection is presented in this letter The antenna is include: modifying radiation patch, 50-Ω tapered feed line and defected ground to improve the antenna characteristics The proposed antenna can be used for the superwide-band (SWB) and ultra-wideband applications The antenna bandwidth is from 3 to 50 GHz for VSWR < 2 Radiation patterns are omni-directional on UWB spectrum A rectangular slot on the patch antenna is carved to remove wireless local area network system (WLAN)

Four-Arm Spiral Antenna Fed by Tapered Transmission Line

Abstract: This letter presents a four-arm Archimedean spiral antenna with a novel integrated tapered transmission line feed structure. The center-fed spiral antenna consists of a radiation region with an Archimedean spiral configuration and a transmission region that comprises four spiral-shaped transmission lines with exponentially decreasing widths. The tapered transmission line, acting as an impedance transformer, provides a broadband matching network between the 50-Ω input impedance and the higher impedance of the radiation region. Using this design, a mode-1 spiral antenna attains a return loss of greater than 15 dB and a 3-dB broadside axial ratio throughout the 0.8–3-GHz band. The fabricated antenna demonstrates good agreement between the simulated and measured results.

Radio with spatially-offset directional antenna sub-arrays

Abstract: An intelligent backhaul radio that has an advanced antenna system for use in PTP or PMP topologies. The antenna system provides a significant diversity benefit. Antenna configurations are disclosed that provide for increased transmitter to receiver isolation, adaptive polarization and MIMO transmission equalization. Adaptive optimization of transmission parameters based upon side information provided in the form of metric feedback from a far end receiver utilizing the antenna system is also disclosed.

Wide band circularly polarised diversity antenna for satellite and mobile communication

Abstract: A wide band circularly polarised diversity antenna consisting of closely spaced monopole radiators is proposed. Two novel, microstrip fed-printed monopoles are designed on a common ground plane. The ground plane which is asymmetric with respect to the feed line along with the planar monopole structure is used to achieve circular polarisation. The monopoles which are symmetric with respect to the vertical axis produce orthogonally polarised waves. A modified split ring resonator-like structure is designed on the ground plane to achieve high port-to-port isolation. The impedance bandwidth (Voltage Standing Wave Ratio 18 dB between the radiating elements is achieved. The proposed antenna provides an axial ratio (AR 70% and gain >2 dBic over the frequency band between 1.73 and 2.63 GHz.

Ultra-Wideband antenna with WLAN and WiMAX band-notch characteristic

Abstract: This paper presents a symmetrical staircase design coplanar waveguide (CPW)-fed, Ultra-Wideband (UWB) antenna having measurements 40.0×30.0×1.60mm3 with 5.0GHz WLAN and 3.5 GHz WiMAX notch-band characteristic. In literature, only WLAN band is being notched, whereas, in our design, the WLAN, as well as WiMAX band, is being notched that has huge advantage in security aspect like jamming of 4G signals and broadband signals. The staircase pattern in the radiating patch of UWB antenna design, U-shaped slot resonator in the feed line and U-formed slot on the staircase patch are utilized to achieve the UWB, notch the 3.5GHz WiMAX band respectively. The frequency range for UWB systems approved by the FCC between 3.1 to 10.6 GHz will cause interference to the existing wireless communication systems, such as the IEEE 802.16 WiMAX system at 3.5 GHz (3.3–3.7 GHz) and the IEEE 802.11a wireless local area network (WLAN) system at 5 GHz (5.15–5.825 GHz). The proposed antenna has impedance bandwidth ranging from 2.00GHz–11GHz to cover UWB. GaAs substrate with dielectric constant of 12.9 and thickness of 1.6mm has been utilized to print the presented antenna.

Compact circular patch with meander line monopole antenna for X-band applications

Abstract: A compact circular patch with slotted meander line (CPSM) microstrip monopole antenna is proposed for X-band applications. Symmetrical circular patches with rectangular slots on either side of monopole feed line to enhance the bandwidth and gain. Impedance bandwidth of proposed antenna is 11.5 %. The operational frequency range of CPSM antenna is 10.48 GHz to 11.74 GHz (1.26GHz bandwidth). The size of the designed CPSM antenna is 75×75mm2. The VSWR is < 2 for the entire band of frequencies.

Computer aided equivalent circuit model of SIW cavity backed triple band slot antenna

Abstract: In this article, a study of planar triple band unidirectional Substrate Integrated Waveguide (SIW) cavity backed slot antenna using equivalent circuit model is presented. The proposed antenna uses a modified dumbbell shaped slot of much larger length placed in a planar SIW cavity to excite three closely spaced SIW cavity hybrid modes which help the slot to radiate into free space. The design is analyzed with the help of equivalent circuit model to predict the resonant frequencies of the design and also to explain the excitation mechanism of the proposed slot antenna. The proposed circuit model is validated by comparing its performance with the simulation model for a wide range of parametric variation. The relationship between modification in design dimension with the variation of coupling between feed line and cavity modes is studied which gives a design guideline for the proposed antenna. The fabricated prototype of the antenna resonates at 7.39, 9.43, and 14.79 GHz with a gain of 3.2, 4.9, 4.7 dBi and front-to-back ratio (FTBR) of 10 dB, respectively, at three resonant frequencies which makes it suitable for C (4–8 GHz), X (8–12 GHz), and Ku (12–18 GHz) band applications.

Design and Analysis of Triple Notched Band Uwb Band Pass Filter Using Defected Microstrip Structure (Dms)

Abstract: This paper presents design, simulation, fabrication and electrical analysis of a triple notched band UWB band pass filter. Short circuit stubs and microstrip line defected structures are used to design a triple notched band UWB filter. The proposed UWB BPF consists of five short circuited stubs of quarter wavelength attached to the feed line. The notched bands are created by introducing three U-shaped defected microstrip structures in the feed line. The proposed structure of the filter is designed, simulated on CST MSW and fabricated using conventional photolithography process. This band pass filter is designed to pass the UWB signals between 3.1 GHz to 10.6 GHz and to eliminate INSAT signal (4.6 GHz), WLAN signal (5.6 GHz) and satellite communication signal (8.0 GHz). The experimental results of this fabricated filter are compared with the simulated results and they are found to be in close agreement to each other. The Electrical equivalent circuit of this triple notched band filter is also presented in this paper and verified mathematically. This filter is compact in size and better in performance. It can be incorporated in UWB communication system to efficiently increase the interference protection from undesired signals. The physical dimension of this filter is about 30x10.5 mm2.

Micro-strip power dividing filter

Abstract: The invention discloses a micro-strip power dividing filter. The filter comprises a metal grounding plate (2) pasted on a lower surface of a rectangular medium substrate (1), an input port feed line (3) pasted on an upper surface, a first output port feed line (41), a second output port feed line (42), a first groove line-microstrip transition structure (51), a second groove line-microstrip transition structure (52), a first E-shaped resonator (61), a second E-shaped resonator (62) and an isolation resistor (7). The first groove line-microstrip transition structure (51) and the second groove line-microstrip transition structure (52) are connected through the isolation resistor (7). The first E-shaped resonator (61) is located between the first groove line-microstrip transition structure (51) and the first output port feed line (41). The second E-shaped resonator (62) is located between the second groove line-microstrip transition structure (52) and the second output port feed line (42). The micro-strip power dividing filter possesses good selectivity and high isolation.

Bandwidth enhancement of monopole antenna with DGS for SHF and reconfigurable structure for WiMAX, WLAN and C-band applications

Abstract: In this study a reconfigurable antenna for WiMAX, WLAN, C-bands and SHF applications has been presented. The main body of antenna includes rectangular and L-shaped slotted ground plane and a rectangular patch with slotted feed line, for impedance bandwidth enhancement. In the proposed antenna, a PIN diode is used to adjust the frequency band to SHF, WiMAX, WLAN and C-bands applications. When PIN diode is forward-biased, the antenna covers the 3.5–31 GHz frequency range (i.e. a 160% bandwidth) and when the PIN diode is in its off-state, it operates between 3.4–5.8 GHz. The designed antenna, with a very small size of 12 × 18 × 1.6 mm3, has been fabricated and tested. The radiation pattern is approximately omnidirectional. Simulations and experimental results are in a good agreement with each other and suggest good performance for the presented antenna.