Showing papers on "Folded inverted conformal antenna published in 2011"
TL;DR: In this article, a triple-frequency microstrip-fed planar monopole antenna for multiband operation is proposed and investigated, which has a small overall size of 20 × 30 mm2, and operates over the frequency ranges 2.14-2.52 GHz, 2.82-3.74 GHz, and 5.15-6.02 GHz suitable for WLAN 2.4/5.8 GHz and WiMAX 3.5/5 GHz applications.
Abstract: A novel triple-frequency microstrip-fed planar monopole antenna for multiband operation is proposed and investigated. Defected ground structure (DGS) is used in this antenna, which has a rectangular patch with dual inverted L-shaped strips and is fed by a cross-shaped stripline, for achieving additional resonances and bandwidth enhancements. The designed antenna has a small overall size of 20 × 30 mm2, and operates over the frequency ranges, 2.14-2.52 GHz, 2.82-3.74 GHz, and 5.15-6.02 GHz suitable for WLAN 2.4/5.2/5.8 GHz and WiMAX 3.5/5.5 GHz applications. There is good agreement between the measured and simulated results. Experimental results show that the antenna gives monopole-like radiation patterns and good antenna gains over the operating bands. In addition, effects of both the length of the protrudent strips and the dimensions of the DGS for this design on the electromagnetic performance are examined and discussed in detail.
270 citations
TL;DR: The proposed design is an octagonal fractal microstrip patch antenna that can be used for 10 GHz -50 GHz frequency range, i.e., it is a super wideband microstrip antenna with 40 GHz bandwidth.
Abstract: The commercial and military telecommunication systems require ultrawideband antennas. The small physical size and multi-band capability are very important in the design of ultrawideband antennas. Fractals have unique properties such as self-similarity and space-filling. The use of fractal geometry in antenna design provides a good method for achieving the desired miniaturization and multi-band properties. In this communication, a multi-band and broad-band microstrip antenna based on a new fractal geometry is presented. The proposed design is an octagonal fractal microstrip patch antenna. The simulation and optimization are performed using CST Microwave Studio simulator. The results show that the proposed microstrip antenna can be used for 10 GHz -50 GHz frequency range, i.e., it is a super wideband microstrip antenna with 40 GHz bandwidth. Radiation patterns and gains are also studied.
170 citations
Patent•
27 May 2011
TL;DR: In this paper, an adjustable antenna can be configured to operate as an inverted-F antenna in one mode of operation and a slot antenna in a second one at different respective communications bands.
Abstract: Electronic devices (10) such as cellular phones include radio-frequency transceiver circuitry coupled to an adjustable antenna (40). The adjustable antenna contains conductive antenna structures such as conductive electronic device housing structures (17-1). Electrical components (42-1,42-2,42-3,42-4) such as switches and resonant circuits are used in configuring the antenna to operate in two or more different antenna modes at different respective communications bands. Control circuitry may be used in controlling the switches. The antenna may be configured to operate as an inverted-F antenna in one mode of operation and a slot antenna in a second mode of operation.
137 citations
TL;DR: In this article, a printed monopole antenna for ultra wideband applications is proposed, which consists of a square radiating patch with an inverted T-shaped slot and a ground plane with inverted t-shaped conductor-backed plane, which provides a wide usable fractional bandwidth of more than 130% (2.91-14.1 GHz).
Abstract: We present a novel printed monopole antenna for ultra wideband applications. The proposed antenna consists of a square radiating patch with an inverted T-shaped slot and a ground plane with an inverted T-shaped conductor-backed plane, which provides a wide usable fractional bandwidth of more than 130% (2.91-14.1 GHz). By cutting a modified inverted T-shaped slot with variable dimensions on the radiating patch and also by inserting an inverted T-shaped conductor-backed plane, additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the higher band. The designed antenna has a small size of 12 × 18 mm2 . Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range.
130 citations
TL;DR: In this paper, a flexible SU-8/PDMS-based antenna has been demonstrated, not only targeting the wearable computing, but also fitting well in the RF system-on-package (RF SOP) applications.
Abstract: In this letter, a flexible SU-8/PDMS-based antenna has been demonstrated, not only targeting the wearable computing, but also fitting well in the RF system-on-package (RF SOP) applications. The characteristics of the proposed antenna fabricated on a flexible polymer substrate (SU-8/PDMS) with different bending angles have been successfully measured and characterized for the first time. The measured results have shown fairly good agreement with the simulation results. The measured bandwidth and maximum gain are 3% from 6.2 to 6.4 GHz and 2.17 dBi, respectively, when the antenna is flat. Moreover, related antenna fabrication process provides a practical approach to realize the flexible antenna for the portable wireless electronics applications.
119 citations
TL;DR: A promising standard solution for a radiating system capable to operate in the main communication standards GSM850, GSM900, DCS, PCS and UMTS is provided with a volume reduction factor around 20.
Abstract: The increasing demand for multifunctional wireless devices has fostered the need to reduce the space devoted to the antenna in order to favor the integration of multiple and new functionalities. This fact becomes a challenge for the handset antenna designers who have to develop antennas capable of providing multi-band operation constrained by physical limitations. This proposal consists in a radiating system capable of providing multi-band operation without the need of an antenna element, by properly exciting the efficient radiation modes associated to the ground plane structure. In this sense, the typical volume devoted to a handset antenna is reduced by a factor of 20. The electrical model approximation of the radiating structure leads to the radiofrequency system design able to provide multi-band operation. The feasibility of the proposal has been tested by electromagnetic simulations as well as by experimental measurements regarding the main antenna parameters: reflection coefficient, efficiency, and radiation patterns. Furthermore, the human head interaction concerning biological compatibility in terms of SAR (Specific absorption rate) has been measured and a solution for its reduction is presented. As a result, a promising standard solution for a radiating system capable to operate in the main communication standards GSM850, GSM900, DCS, PCS and UMTS is provided with a volume reduction factor around 20.
97 citations
TL;DR: In this article, a two-strip monopole and a meandered strip antenna was designed and developed for multiband planar antenna with a compact size for mobile devices, which has a bandwidth of 42% at the 900 MHz band and 53% at 1900 MHz band.
Abstract: A new multiband planar antenna with a compact size is designed and developed for mobile devices. The proposed antenna consists of a two-strip monopole and a meandered strip antenna which occupy a compact area of only 15 mm × 42 mm. This planar antenna has a bandwidth of ~ 42% at the 900 MHz band and ~ 53% at the 1900-MHz band. The wide bandwidth at the low frequency is attributed to the mutual coupling of an S-shaped strip and an inverted-F strip which are separately printed on the two sides of a thin substrate, forming a two-strip monopole configuration. The bandwidth at the high frequency is enhanced by inserting a meandered strip which improves the impedance matching for the high-frequency band. The experimental results verify the simulations. The featured broad bandwidths over two frequency bands and the miniaturized size of the proposed antenna make it very promising for applications in wireless communication and wireless sensing devices.
92 citations
TL;DR: An internal folded reconfigurable loop antenna for mobile handset applications is designed, built, and tested, and the efficiency and gain with the p-i-n diodes with their bias circuit are measured and analyzed.
Abstract: In this letter, an internal folded reconfigurable loop antenna for mobile handset applications is designed, built, and tested. Two operating states with different frequencies are obtained by switching the shorting pins of the loop. The bandwidth of the proposed antenna has been increased by adopting a matching bridge. In a compact volume of 60×5×5 mm3, the proposed antenna operates in heptaband, including GSM850, GSM900, GPS, DCS, PCS, UMTS, and WLAN, with the return loss lower than 6 dB. The efficiency and gain with the p-i-n diodes with their bias circuit are also measured and analyzed.
91 citations
TL;DR: In this article, a self-packaged folded patch antenna with a complementary split-ring resonator (CSRR) is fabricated on a flexible substrate and folded in a cylindrical shape.
Abstract: A patch loaded with a complementary split-ring resonator (CSRR) is fabricated on a flexible substrate and folded in a cylindrical shape, forming a self-packaged folded patch antenna with a quasi-omnidirectional radiation pattern. The space inside the cylindrical cavity is electromagnetically shielded by the ground plane of the patch, and therefore electronic circuits can be accommodated in it with little electromagnetic interference (EMI) from the antenna or other external electronics. The CSRR contributes to size reduction. As a test vehicle, a 2.4-GHz ISM-band folded patch antenna is designed, fabricated, and characterized for a wireless capsule endoscope application, where the implemented antenna has a patch length of 10.5 mm (0.11λ ) and a folded cylinder diameter of 10 mm. A 74% size reduction is achieved after CSRR loading. The antenna located at the outermost surface not only functions as an electromagnetic radiator and an EMI shield, but also serve as a mechanical packaging structure.
79 citations
TL;DR: In this paper, a triple-band WLAN antenna with a planar inverted-F antenna (PIFA) in conjunction with a parasitic element is proposed, which is the most compact WLAN internal antenna covering the three frequency bands.
Abstract: A triple-band wireless local area network (WLAN) antenna has been proposed. The antenna comprises a planar inverted-F antenna (PIFA) in conjunction with a parasitic element. It has been demonstrated that triple-band WLAN operations including the IEEE 802.11 2.4 GHz (2.4-2.484 GHz), 5.2 GHz (5.15-5.35 GHz), and 5.8 GHz (5.725-5.825 GHz) can be achieved by using the proposed antenna with a very compact size, probably the most compact WLAN internal antenna covering the three frequency bands.
71 citations
TL;DR: In this paper, a compact internal antenna that is composed of a coupled loop with two branch lines is presented, which operates at two wide frequency bands (698 ~ 960 MHz/1710 ~ 2690 MHz).
Abstract: A compact internal antenna that is composed of a coupled loop with two branch lines is presented. The proposed antenna operates at two wide frequency bands (698 ~ 960 MHz/1710 ~ 2690 MHz) to cover octabands LTE 700/GSM 850/GSM 900/DCS 1800/PCS 1900/WCDMA 2100/LTE 2300/LTE 2500 for the 4G mobile handset. The proposed antenna is designed and fabricated on a support (polyester; er=3.2) with a limited volume, i.e., 7×11×46 mm3. The design methods and the measured results of the proposed antenna are presented in detail.
TL;DR: In this paper, a compact multiband antenna formed by two printed open-ended slots, with the first one a T-shaped slot and the second one an E-shape slot, cut at the edge of the ground plane of mobile handsets, is presented.
Abstract: A novel compact multiband antenna formed by two printed open-ended slots, with the first one a T-shaped slot and the second one an E-shaped slot, cut at the edge of the ground plane of mobile handsets is presented. This antenna can generate five resonant modes to cover GSM900/DCS1800/ PCS1900/UMTS and 2.4-GHz-based WLAN bands, which can be controlled almost independently by the five respective monopole slots of different lengths. Furthermore, the proposed antenna has a simple planar structure and occupies a small area of only 10 × 42.5 mm2. It is also promising to bend the antenna into a E shape, inverted-T shape and meander line to reduce its volume occupied. Details of the antenna design and experimental results are presented and discussed.
TL;DR: A novel printed multiband inverted-F antenna for laptop computers is presented, designed to operate in all the allocated Wi-Fi and WiMAX frequency bands while providing near omnidirectional coverage in the horizontal plane.
Abstract: A novel printed multiband inverted-F antenna (IFA) for laptop computers is presented. The antenna has a simple structure and it is sufficiently narrow to easily fit on each side of the housing of the display unit of the laptop. The antenna is designed to operate in all the allocated Wi-Fi and WiMAX frequency bands while providing near omnidirectional coverage in the horizontal plane. The multiband performance of the proposed antenna and its omnidirectionality are validated by measurements.
TL;DR: In this paper, a single feed compact rectangular microstrip antenna is presented in which a triangular slot is introduced at the upper edge of the patch to reduce the resonant frequency and a small piece of triangular patch is added within the area of the triangular slot to improve the gain bandwidth performance of the antenna.
Abstract: A single feed compact rectangular microstrip antenna is presented in this paper. A triangular slot is introduced at the upper edge of the patch to reduce the resonant frequency. A small piece of triangular patch is added within the area of the triangular slot to improve the gain bandwidth performance of the antenna. The antenna size has been reduced by 46.2% when compared to a conventional square microstrip patch antenna with a maximum of 160MHz bandwidth and i27:36dB return loss. The characteristics of the designed structure are investigated by using MoM based electromagnetic solver, IE3D. An extensive analysis of the return loss, radiation pattern, gain and e-ciency of the proposed antenna is shown in this paper. The simple conflguration and low proflle nature of the proposed antenna leads to easy fabrication and make it suitable for the
TL;DR: In this paper, the authors realize artificial magneto-dielectric loading for microstrip patch antenna by etching embedded meander-line (EML) array in the ground plane under the patch.
Abstract: We realize artificial magneto-dielectric loading for microstrip patch antenna by etching embedded meander-line (EML) array in the ground plane under the patch. The related artificial magneto-dielectric medium belongs to the waveguided metamaterial proposed previously. Both simulation and measurement results show that the proposed patch antenna with the EML array has wider impedance bandwidth than the conventional patch antenna with the same size. Though we have to increase the antenna profile by attaching an additional shield metal plate to suppress the back radiation, the proposed magneto-dielectric loading method requires lower fabrication complexity and lower cost than the existing techniques.
TL;DR: In this article, a coplanar waveguide-fed planar quasi-Yagi antenna for multiband operation is presented, which consists of a basic quasi Yagi element and a basic WRSG element, which can excite the oddmode electric fields at the CPS line though the CPW feed line.
Abstract: A novel coplanar waveguide-fed planar quasi-Yagi antenna for multiband operation is presented in this letter. The antenna consists of a basic quasi-Yagi element and a coplanar-waveguide-to-coplanar-strip (CPW-to-CPS) transition, which can excite the odd-mode electric fields at the CPS line though the CPW feed line. The proposed antenna can be used in multiband operation with directional radiation patterns whose front-to-back ratios approximate to 10 dB for desired bands. Its impedance bandwidth, determined by -10-dB reflection coefficient, covers numbers of present wireless communication systems, and the antenna can be simply integrated with other circuit components for its planar structure. Experimental data obtained from a laboratory prototype are also presented. The experimental results confirm the good performances observed by the electromagnetic simulations.
TL;DR: In this article, a coplanar waveguide (CPW)-fed slot antenna with bandstop characteristics is presented for ultra-wideband (UWB) applications, which consists of a rotated square-shaped patch and a 50Ω CPW feed line.
Abstract: A novel coplanar waveguide (CPW)-fed slot antenna with bandstop characteristics is presented for ultra-wideband (UWB) applications. The proposed antenna consists of a rotated square-shaped patch and a 50Ω CPW feed line. By embedding an inverted V-shaped slot with folded ends, the band rejection property is achieved. Also, etching two slots on the ground plane leads to an improvement in impedance bandwidth. The proposed antenna covers the frequency range of 3.04–20.22 GHz for VSWR < 2, and rejects 5–6 GHz. The total size of the antenna is 20 × 18 × 1.6mm3, which is smaller than many of the designed slot antennas and covers wider bandwidth. For the fabricated antenna, an omnidirectional pattern is observed over the whole UWB frequency range.
TL;DR: In this paper, a magneto-dielectric substrate was proposed to reduce the antenna dimensions by increasing the constitutive parameters of the substrate, and the proposed structure is thin enough to be embedded in a single dielectric material.
Abstract: Miniaturization of a rectangular microstrip antenna using a magneto-dielectric substrate is discussed theoretically and experimentally. A compact magneto-dielectric substrate is designed using a metamaterial structure that can reduce the antenna dimensions by increasing the constitutive parameters of the substrate. Furthermore, the proposed structure is thin enough to be embedded in a single dielectric substrate. The area of the microstrip antenna with the proposed magneto-dielectric substrate at 2.4 GHz is reduced up to about 65% compared to a conventional dielectric microstrip antenna. The bandwidth of the miniaturized antenna is almost unchanged due to the increase of the magnetic permeability at the designed 2.4-GHz frequency. Finally, a fabricated version of the miniaturized antenna is tested and measured. The results of the measurement and simulation are in good agreement.
TL;DR: In this paper, a dual-polarization loop antenna is presented for possible use in wireless local area network (WLAN) applications, which consists of a rectangular loop, a coplanar waveguide (CPW), and a microstrip line.
Abstract: Design, prototyping, and testing of a dual-polarization loop antenna is presented for possible use in wireless local area network (WLAN) applications. The antenna design consists of a rectangular loop, a coplanar waveguide (CPW), and a microstrip line. The loop antenna operates in two orthogonal one-wavelength modes, which are excited by one CPW feed structure. The overall dimension of the prototype is only 40 × 53 mm2, including the feed structure. The measured -10-dB reflection coefficients bandwidth of the two modes are 770 MHz (32.1%) and 730 MHz (30.4%) at the operating frequency of 2.4 GHz. In the WLAN band, the ports isolation is better than -21.3 dB. Gains of the two modes are better than 2.9 and 4.1 dBi. Radiation patterns are measured and compared to simulation results. The proposed antenna has the advantages of compact dimension, wide bandwidth, good ports isolation, and low cross polarization.
TL;DR: In this paper, a miniaturized multiband antenna formed by three folded slots of different lengths cut at the ground plane of the mobile handsets is presented, which can generate six wireless communication bands to cover GSM900/DCS1800/PCS1900/UMTS/2.4GHz-based WLAN and Satellite DMB bands.
Abstract: A novel miniaturized multiband antenna formed by three folded slots of different lengths cut at the ground plane of the mobile handsets is presented. The proposed antenna can generate six wireless communication bands to cover GSM900/DCS1800/PCS1900/UMTS/2.4-GHz-based WLAN and Satellite DMB bands. Moreover, the antenna has a simple planar structure of small area of only 18×38 mm2. It is also promising to bend the antenna into an L shape or meander line to reduce its volume occupied inside the mobile handsets. Good radiation characteristics, gain, and radiation efficiency are obtained over these six operating bands.
TL;DR: A small antenna with coupling feed and parasitic elements for multiband application is proposed in this paper, which is able to support the GSM850/GSM900/DCS/PCS frequency band in 3:1 VSWR standard.
Abstract: A small antenna with coupling feed and parasitic elements for multiband application is proposed The proposed antenna is small, low-profile, and suitable for multiband mobile applications The coupling feed structure provides wideband characteristic to a planar inverted-F antenna (PIFA) There are two resonance modes at 08 GHz, and their current distributions are observed Four resonance modes from high-order resonance modes and parasitic elements are designed to be at 17 GHz The proposed antenna is able to support the GSM850/GSM900/DCS/PCS frequency band in 3:1 VSWR standard The radiation efficiency and radiation patterns are presented to verify compatibility in mobile handset applications
Journal Article•
05 May 2011
TL;DR: To My Parents 4 ACKNOWLEGEMENTS I would like to express my sincere gratitude to the School of Engineering in the University of Borås for the effective contribution in carrying out this thesis.
Abstract: The performance and advantages of microstrip patch antennas such as low
weight, low profile, and low cost made them the perfect choice for
communication systems engineers. They have the capability ...
TL;DR: The results obtain that microstrip patch antenna can be used as client antenna in computer and workable antenna for wireless fidelity.
Abstract: This paper presents a broadband microstrip patch antenna for wireless communication. In its most basic form, a microstrip patch antenna consists of a radiating patch on one side of a dielectric substrate which has a ground plane on the other side. The patch is generally made of conducting material such as copper or gold and can take any possible shape. A rectangular patch is used as the main radiator. There are several advantages of this type of broadband antenna, such as planar, small in size, simple in structure, low in cost, and easy to be fabricated, thus attractive for practical applications. This rectangular microstrip patch antenna is designed for wireless communication application that works at 2.4 GHz with gain 11 dB for outdoor place. It also has a wide angle of beam in its radiation pattern. The results obtain that microstrip patch antenna can be used as client antenna in computer and workable antenna for wireless fidelity.
TL;DR: In this paper, a planar monopole antenna which covers an ultra wide bandwidth of ∼147% from 2.96 to 19.43 GHz for S11 ≤ −10 dB is presented.
Abstract: A new compact planar monopole antenna which covers an ultra wide bandwidth of ∼147% from 2.96 to 19.43 GHz for S11 ≤ −10 dB is presented. The proposed antenna has simple configuration and easily fed by using a 50 Ω microstrip line. The total size of the antenna is 30 × 26 × 1.6 mm3. © 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2011. © 2011 Wiley Periodicals, Inc.
TL;DR: In this article, a single-layer rectangular microstrip patch antenna has been proposed, which uses a ground plane with a single slot and has been shown that by using this slotted ground plane, the resonant frequency has been lowered considerably, thus, reducing the size of the antenna.
Abstract: In this article, a new design for single-layer rectangular microstrip patch antenna has been proposed.This design uses a ground plane with a single slot. It has been shown that by using this slotted ground plane, the resonant frequency has been lowered considerably, thus, reducing the size of the antenna. Using this design, the size of the antenna is reduced by about 90%. It has been also shown that the resonant frequency can be reduced further by increasing the length of the slot. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:111–115, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25661
TL;DR: The planar inverted-F antenna (PIFA) is widely used in mobile radio systems because of its excellent performance as discussed by the authors, however, it is not yet employed as an ultra wide band (UWB) antenna because of the perceived narrowband characteristics.
Abstract: The planar inverted-F antenna (PIFA) is widely used in mobile radio systems because of its excellent performance. However, it is not yet employed as an ultra wide band (UWB) antenna because of its perceived narrowband characteristics. This study introduces three techniques for enhancing the impedance bandwidth of PIFA, which are (i) changes in the widths of feed plate and shorting plate, (ii) addition of an inverted-L-shaped parasitic element and (iii) addition of a rectangular parasitic element. It is shown that PIFAs with a very wide fractional bandwidths (up to 110%) can be achieved. Using these techniques, an UWB PIFA antenna is designed, manufactured and tested. Simulated and measured results are provided to verify the conclusion.
TL;DR: In this paper, a WWAN/LTE printed loop antenna for tablet computer application is presented, which is a halfwavelength loop strip coupled-fed by a patch monopole, which performs not only as a coupling feed but also as an efficient radiator for the antenna.
Abstract: A WWAN/LTE printed loop antenna for tablet computer application is presented.The printed loop antenna is a half-wavelength loop strip coupled-fed by a patch monopole, which performs not only as a coupling feed but also as an efficient radiator for the antenna. By embedding a printed distributed inductor in the loop strip, dual-resonance excitation of the half-wavelength mode of the coupled-fed loop antenna is obtained, which forms the antenna's lower band at about 800 MHz to cover the LTE700/GSM850/900 operation (704–960 MHz). The antenna's upper band is formed by both the resonant modes contributed by the patch monopole and the higher order resonant modes contributed by the loop strip. The upper band shows a large bandwidth (>1 GHz) to cover the GSM1800/1900/UMTS/LTE2300/2500 operation (1710–2690 MHz). Further, with a planar and compact structure (12 × 75 mm2), the antenna is suitable to be disposed in the limited space inside the tablet computer and meets the body specific absorption rate (SAR) requirement (<1.6 W/kg for 1-g body tissue) for practical applications. Details of the proposed antenna and its body SAR results are presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2912–2919, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26377
01 Oct 2011
TL;DR: In this paper, the side lengths and angles of the inserted diamond shape slot have been optimized to achieve a single layer multi-frequency microstrip antenna applicable for C band space communication systems.
Abstract: The radiation performance of a circular patch microstrip antenna having a concentric diamond shape slot has been presented in this paper. The side lengths and angles of the inserted diamond shape slot have been optimized to achieve a single layer multi frequency microstrip antenna applicable for C band space communication systems. For simulation work, IE3D simulation software has been applied and later this antenna has been designed and tested by applying glass epoxy FR-4 substrate. The proposed antenna provides much improved bandwidth (measured impedance bandwidth 0.87 GHz or 13.58%) than a conventional circular patch antenna. The gain of proposed antenna is almost constant in the frequency range where broadband performance is realized, however, it is improved considerably in comparison to a conventional circular patch antenna. The performance of proposed antenna has been compared with that of a conventional circular patch antenna having identical patch radius. The measured co and cross polar patterns of proposed antenna at one of the three resonance frequencies have been presented.