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Proceedings ArticleDOI

A compact 3.5/5.5 GHz dual band-notched monopole antenna for application in UWB communication systems with defected ground structure

TL;DR: In this article, the authors proposed an ultrawideband monopole antenna having dual band-notched characteristics with a defected ground structure (DGS) and two symmetrical L-shaped slots are created on the ground plane to generate the UWB characteristics in the proposed antenna.
Abstract: A compact ultrawideband monopole antenna having dual band-notched characteristics with a defected ground structure (DGS) proposed. Two symmetrical L-shaped slots are created on the ground plane to generate the UWB characteristics in the proposed antenna. To generate the notch at 5.2/5.8 GHz band, a U-shaped slot is cut in the rectangular radiating element, which mitigate the potential interference with WLAN. To have another notch band simultaneously around 3.0/4.0 GHz, which is the operating band of WiMAX (3.3–3.6 GHz) and C-band (3.7–4.2 GHz), an inverted U-shaped element is printed on the opposite side of the substrate. By properly varying the dimensions of the U-shaped slot and the radiating element, not only two controllable notch resonances, but also a very wide bandwidth from 1.91 GHz to 3.91 GHz (152%) with two sharp notched bands covering all the 3.5/5.5 GHz WiMAX, 4 GHz C-band and 5.2/5.8 GHz WLAN, are achieved. The proposed antenna properly optimized and simulated providing broadband impedance matching, appropriate gain and stable radiation pattern characteristics.
Citations
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Proceedings ArticleDOI
16 Apr 2011
TL;DR: In this article, a CPW-feed printed antenna is proposed to improve the connection between the antenna and the coaxial cable, which is designed to cover two frequency bands of 1.84-2.5 GHz and 4.9-6.3 GHz.
Abstract: In this paper, we present the design of a CPW-feed printed antenna which improves the connection between the antenna and the coaxial cable. The proposed antenna is designed to cover two frequency bands of 1.84–2.5 GHz and 4.9–6.3 GHz, which are required by the dual-band WLAN communication. In this work, it is found that the distance between the radiator and the ground is the key parameter for the design of the antenna to work in two resonant bands. Furthermore, tuning the shape of the radiator and the position of the slots on the ground will widen the high resonant band of the antenna. This design of the antenna is simulated on an FR4 substrate with a thickness of 0.4 mm and an area of 11×67 mm2. Being small in size, cheap in manufacturing, and simple in profile, the proposed antenna is perfect to be embedded into an access point of dual-band WLAN.

7 citations


Cites methods from "A compact 3.5/5.5 GHz dual band-not..."

  • ...This design of the antenna is simulated on an FR4 substrate with a thickness of 0.4 mm and an area of 11x67 mm2....

    [...]

Proceedings ArticleDOI
14 Nov 2013
TL;DR: In this paper, a planar ultra wideband (UWB) microstrip-fed antenna with defected ground structure and two parasitic patches is presented, which provides a wider bandwidth than the ordinary rectangular antenna especially in the middle frequencies.
Abstract: A simple planar ultra-wideband (UWB) microstrip-fed antenna with defected ground structure and two parasitic patches is presented. Two symmetrical quarter-circle shaped segments are cut both on the each of lower edges of the radiating patch and on the each of upper edges of the ground plane. These segments provide a wider bandwidth than the ordinary rectangular antenna especially in the middle frequencies. By means of removing U-shaped slot in the radiating patch the radiation characteristics of the 7-10 GHz frequency range are improved. Two half-circle shaped parasitic patches are connected via a hole to the ground plane. These patches are added on both sides of the 50-Ω microstrip-fed line to achieve good radiation performance for frequencies higher than 10 GHz. The proposed antenna is simulated by ANSYS's HFSS program using finite element method (FEM). The simulation results show that 127% of the impedance bandwidth is between 3.1 and 13.8 GHz for 20log|S11|<;-10 dB. The simulated antenna is fabricated on FR4 substrate and measured.

6 citations

Dissertation
01 Jan 2013
TL;DR: In this paper, a low-cost compact microstrip line-fed antenna with parasitic patches resulting a ultra-wideband characteristics with a band dispensation is presented, where the antenna was implemented on FR4 substrate with a thickness of 1.6mm and relative permittivity (µr) of 4.3.
Abstract: The increasing use of wireless mobile communication systems demand the antennas for different systems and standards with properties like reduced size, broadband, multi band operation, moderate gain etc. The planar and dielectric resonator antennas are the present day antenna designer’s choice. However, micro strip and Dielectric resonator antennas inherently have a narrow bandwidth. Since the Federal Communications Commission (FCC) first approved rules for the commercial use of ultra-wideband (UWB) in 2002, the experiments on ultra wide band (UWB) systems have been expanding rapidly. In this thesis, a low-cost compact microstrip line-fed antenna with parasitic patches resulting a Ultra-Wideband characteristics with a band dispensation is presented. The antenna was implemented on FR4 substrate with a thickness of 1.6mm & relative permittivity (µr) of 4.3 .It has a partial ground plane .The antennas is exited by microstrip line feed. The proposed antenna is a Rectangular shape , “T” shape,& “ð” shape made of Teflon of permittivity (µr) of 2.1& compare with “ð” shape made of Roger of permittivity (µr) of 10.2 .The proposed antenna is simulated with CST Studio 2011. The return loss results and radiation pattern plots of the antenna are included in this thesis.
Proceedings ArticleDOI
01 Dec 2014
TL;DR: Design and performance of an extremely wideband quasi-self-complementary pentagonal antenna with wireless local area network (WLAN) stop band with dependence on the various parameters has been studied and results presented systematically.
Abstract: Design and performance of an extremely wideband quasi-self-complementary pentagonal antenna with wireless local area network (WLAN) stop band have been analyzed in this paper. It consists of a pentagonal shaped radiator with its complementary structure, CPW feed line and two symmetric modified U-shaped slots in the ground plane. It is designed on RT 5880 dielectric material with relative permittivity of 2.2 and thickness of 3.175 mm. The predicated extremely wide impedance bandwidth is 2.78–15.85 GHz, for VSWR 2. An extremely wideband is achieved by modifying ground plane and stop band is acquired by inserting slots in the ground structure. The dependence of antenna on the various parameters has been studied and results presented systematically. Significant gain reduction in the stop band is also observed with satisfactory radiation patterns.

Cites methods from "A compact 3.5/5.5 GHz dual band-not..."

  • ...Various methods for achieving band-notched characteristics are reported in the literature [5]-[9] to design antennas that can reject these narrow bands and improve the functionality with increased signal quality....

    [...]

Dissertation
29 May 2014
TL;DR: In this paper, a low-cost compact dielectric resonator antenna array resulting wideband characteristics with a band dispensation is presented. And the proposed antenna array is then optimized using genetic optimization technique to reduce the side lobe level and at the same time to increase the directive gain.
Abstract: The increasing use of wireless and satellite communication systems demand the antennas for different systems and standards with properties like reduced size, broadband, multiband operation, moderate gain etc. The planar and dielectric resonator antennas are the present day antenna designer’s choice. However, conducting microstrip patch antennas inherently have a narrow bandwidth. In this thesis, a low-cost compact Dielectric Resonator Antenna array resulting Wideband characteristics with a band dispensation is presented. The antenna is implemented on FR4 substrate with a thickness of 1.6 mm and relative permittivity (ar) of 4.4. It has a partial ground plane. The antenna array is fed by the rectangular conformal patch attached to microstrip line. The reflection coefficient (S11) is less than -10 dB in 5.4 GHz−7.4 GHz frequency range with possible satellite applications. The array factor consideration for Rectangular Dielectric Resonator Antenna is also been analysed in this thesis. The proposed antenna array is then optimized using genetic optimization technique to reduce the side lobe level and at the same time to increase the directive gain of the antenna. The performance characteristics of the proposed antenna are simulated using CST microwave studio 2011TM software. The performance characteristics that have been analysed using CST microwave studio 2011TM software are Return loss (S11), Voltage Standing Wave Ratio (VSWR) and Farfield radiation pattern plot. The ‘Roger’ dielectric material is used for resonator having dielectric constant (ar=10.1). The dielectric material ‘Teflon’ can also be introduces in place of roger as rogger is not easily available. The thesis contains MATLAB generated plots showing the optimization using the concept of genetic algorithm.

Cites background from "A compact 3.5/5.5 GHz dual band-not..."

  • ...DRAs are derived from dielectric resonator, based on varieties of excited feeding techniques [11]....

    [...]

References
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Journal ArticleDOI
S.B. Cohn1
TL;DR: In this paper, a second-order analysis yields formulas for slot-line wavelength, phase velocity, group velocity, characteristic impedance, and effect of adjacent electric and magnetic walls, which can be used either alone or with microstrip line on the opposite side of the substrate.
Abstract: Slot line consists of a narrow gap in a conductive coating on one side of a dielectric substrate, the other side of the substrate being bare. If the substrate's permittivity is sufficiently high, such as /spl epsiv//sub r/ = 10 to 30, the slot-mode wavelength will be much smaller than free-space wavelength, and the fields will be closely confined near the slot. Possible applications of slot line to filters, couplers, ferrite devices, and circuits containing semiconductor elements are discussed. Slot line can be used either alone or with microstrip line on the opposite side of the substrate. A "second-order" analysis yields formulas for slot-line wavelength, phase velocity, group velocity, characteristic impedance, and effect of adjacent electric and magnetic walls.

368 citations

Journal ArticleDOI
TL;DR: In this paper, a novel ultra-wideband antenna with band elimination characteristic is presented, which has omnidirectional patterns in the E-plane and impedance bandwidth of about 3-18 GHz with VSWR below 2.
Abstract: A novel ultra-wideband antenna with band elimination characteristic is presented, which has omnidirectional patterns in the E-plane and impedance bandwidth of about 3-18 GHz with VSWR below 2. The proposed antenna is fed by microstrip line, and consists of the monopole type with two parasitism-patches rejecting 5.15-5.825 GHz bandlimited by IEEE 802.11a and HIPERLAN/2.

307 citations

Journal ArticleDOI
TL;DR: In this article, a band notch characteristic using a slot-type split ring resonator (SRR) working at microwave frequencies is used for designing a UWB antenna requiring the rejection of some frequency band, which is already in use by existing wireless services.
Abstract: A band notch characteristic using a slot-type split ring resonator (SRR) working at microwave frequencies is used for designing a UWB antenna requiring the rejection of some frequency band, which is already in use by existing wireless services. The slot-type SRR is employed effectively for notching unwanted frequency band such as that for WLAN service, since it can be implemented with a small dimension and in a high Q operation similarly to the conventional strip-type SRR. Based on the simulation and measurement results, a band notched UWB antenna using a slot-type SRR is very effective in rejecting unwanted frequency in terms of its selectivity and small real estate.

280 citations

Journal ArticleDOI
TL;DR: In this paper, a planar ultrawideband (UWB) antenna with band-notched function is proposed, which consists of a radiation patch that has an arc-shaped edge and a partially modified ground plane.
Abstract: A novel planar ultrawideband (UWB) antenna with band-notched function. The antenna consists of a radiation patch that has an arc-shaped edge and a partially modified ground plane. The antenna that makes it different from the traditional monopole antenna is the modification in the shape of ground plane, including two bevel slots on the upper edge and two semicircle slots on the bottom edge of the ground plane. These slots improve the input impedance bandwidth and the high frequency radiation performance. With this design, the return loss is lower than 10 dB in 3.1-10.6 GHz frequency range and the radiation pattern is highly similar to the monopole antenna. By embedding a pair of T-shaped stubs inside an elliptical slot cut in the radiation patch, a notch around 5.5 GHz WLAN band is obtained. The average gain is lower than -18 dBi in the stopband, while the patterns and the gains at frequencies other than in the stopband are similar to that of the antenna without the band-notched function.

207 citations

Journal ArticleDOI
TL;DR: In this paper, a band-rejected ultrawideband antenna with one parasitic strip is presented, which is designed to work on a substrate FR4 that has a thickness of 1 mm and relative permittivity of 4.6.
Abstract: A novel band-rejected ultrawideband antenna with one parasitic strip is presented in this paper. It is designed to work on a substrate FR4 that has a thickness of 1 mm and relative permittivity of 4.6, and to operate from 3 to 17 GHz. The proposed antenna is fed by microstrip line and utilizes the parasitic strip to reject the frequency band (5.15-5.825 GHz) limited by IEEE 802.11a and HIPERLAN/2. The size of the antenna is 20/spl times/20 mm/sup 2/ and this antenna has good radiation characteristics. Effects of varying the location and length of the parasitic strip and the structure of the ground and monopole patch on the antenna performance have also been studied.

188 citations