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Journal ArticleDOI

Circular Microstrip Patch Loaded With Balanced Shorting Pins for Improved Bandwidth

TL;DR: In this paper, a shorted patch geometry is examined with a circular patch loaded with a pair of balanced shorting pins and the proposed design is simple and straight forward as the location of the balanced pins are fixed with respect to the patch center.
Abstract: A shorted patch geometry is examined with a circular patch loaded with a pair of balanced shorting pins. The proposed design is simple and straight forward as the location of the balanced pins are fixed with respect to the patch center. Nearly double the impedance bandwidth has been achieved with a balanced pin loaded circular patch operating in X band without sacrificing the gain or radiation properties compared to its conventional counterpart. This is an important advantage of the proposed configuration. Both measured and simulation results are presented.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a folded-patch feed's techniques and shorting pins are used to provide the impedance bandwidth of 94.17% (4.13-11.48 GHz) and 98.22% (3.57-10.46 GHz), respectively.
Abstract: This letter introduces novel designs of miniaturized wideband microstrip patch antennas for ultrawideband (UWB) applications. The antennas are achieved by using folded-patch feed's techniques and shorting pins to provide the impedance bandwidths $({\rm VSWR} \leq 2)$ of 94.17% (4.13–11.48 GHz) and 98.22% (3.57–10.46 GHz), respectively. By introducing a folded ramp-shaped feed, the impedance bandwidths of the proposed antennas are considerably enhanced. Shorting pins are utilized to miniaturize the size of the patches. In the first design, unequal arms fed by a folded ramp-shaped patch produce three resonances to broaden the impedance bandwidth. Also at the second design, by adding one pin in the center of the shorted patch with a folded ramp-shaped feed, a broadband antenna is obtained. In addition, the wideband mechanism of the proposed antennas is described and discussed by investigating the effects of some key parameters.

47 citations

Journal ArticleDOI
TL;DR: In this article, a probe-fed compact wideband microstrip patch antenna which is configured of an asymmetric E-shaped patch, a folded-patch feed and shorting pins is presented.
Abstract: A design of probe-fed compact wideband microstrip patch antenna which is configured of an asymmetric E-shaped patch, a folded-patch feed and shorting pins, is presented in this study. In this design, unequal resonance arms fed by a folded patch produce three resonances to broaden the impedance bandwidth. Shorting pins are applied to miniaturise the size of the patch. The performance of broadening the impedance bandwidth is explored by investigating the behaviour of the surface currents on the patch. The antenna presents resonance tuning ability within the impedance bandwidth by varying the length of unequal arms. The measured -10 dB impedance bandwidth of the fabricated antenna is 76.18% from 3.34 to 7.45 GHz for ultra-wideband applications. The size of this antenna is 0.379 λ L × 0.145 λ L × 0.078 λ L , where λ L is wavelength at the lower frequency of the measured operating bandwidth in the free space. Fabrication of this antenna is less complex than similar wideband antennas with folded-patch feed. In addition, parametric studies are performed by investigating the effects of different key parameters on obtaining an optimal design of the proposed antenna design.

32 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive study of miniaturized broadband microstrip patch antennas for ultra-wideband applications is presented, which is composed of a folded-patch feed, a symmetric E-shaped edge, a U-shaped-slot patch and shorting pins.
Abstract: In this paper, a comprehensive study of miniaturised broadband microstrip patch antennas for ultra-wideband applications is presented. At first, design and analysis of a compact wideband basic antenna which is composed of a folded-patch feed, a symmetric E-shaped edge, a U-shaped-slot patch and shorting pins are studied and investigated. The measured −10 dB impedance bandwidth of the proposed basic antenna is about 92% in the frequency range 3.94–10.65 GHz. To explicitly demonstrate the mechanism of the bandwidth enhancement method, the equivalent transmission line model of the basic antenna is exhibited. This model contributes the effect of different parts used in the basic antenna structure in order to predict the broadband behaviour of it. Moreover, with the use of a V-shaped slot instead of the U-shaped slot on the patch, an improved antenna with a wider bandwidth in order to cover the frequency range from 4 to 14.4 GHz is obtained. This improved design introduces comparatively a simpler structure with considerable size reduction and an enhancement of 21% in impedance bandwidth compared with the basic antenna. Experimental investigations and detailed simulations based on the parametric study are performed to describe and optimise the broadband performance of the proposed designs.

31 citations

Journal ArticleDOI
TL;DR: In this paper, a polygonal patch antenna for ultra-wideband applications covering a frequency band from 4.14 to 13.50 GHz was proposed, which achieved a 10 dB impedance bandwidth in excess of 125 with an antenna size of 0.373 lambda o times 0.149 lambda o at its center frequency.
Abstract: The authors present the results of a polygonal patch antenna for ultra-wideband applications covering a frequency band from 4.14 to 13.50 GHz. The fabricated antenna achieved a 10 dB impedance bandwidth in excess of 125 with an antenna size of 0.373lambda o times0.373lambda o times0.149lambda o at its centre frequency. The antenna's impedance bandwidth is 64% higher than what is currently obtainable with state-of-the-art folded-patch techniques. The proposed patch antenna has a polygonal-shape with a rectangular slot and shorting pins. The analysis of this antenna shows that bandwidth broadening is achieved by using a rectangular slot on the patch that is fed from a folded-patch feed, whereas the reduction in antenna size is achieved through the use of two shorting pins strategically located on the radiating patch.

19 citations

Journal ArticleDOI
TL;DR: In this paper, a probe-fed broadband shorted patch antennas for ultra wideband (UWB) applications are presented, where unequal resonance arms fed by a folded patch produce multi resonances to broaden the impedance bandwidth.
Abstract: Novel designs of probe-fed broadband shorted patch antennas for ultra-wideband (UWB) applications are presented in this paper. In these designs, unequal resonance arms fed by a folded patch produce multi resonances to broaden the impedance bandwidth. In the flrst design, the antenna consists of an asymmetric E-shaped patch, a folded-patch feed and shorting pins. This antenna is achieved by four adjacent resonances with the measured i10dB impedance bandwidth of 76.18%. The pins are utilized to miniaturize the size of the patch. By introducing a folded ramp-shaped feed in the similar structure with the flrst design, a wider bandwidth with the flve resonances is obtained. This improved design introduces an antenna with an impedance bandwidth of more than 110% and a considerable size reduction compared to the flrst antenna. The antennas present resonance tuning ability within the impedance bandwidth by varying the length of unequal arms. In addition, parametric studies are performed by investigating the efiects of difierent key parameters on obtaining optimal designs of the proposed antennas.

18 citations


Cites methods from "Circular Microstrip Patch Loaded Wi..."

  • ...Other common methods to improve the impedance bandwidth are the implementation of stacked patch antennas [16, 17], L-probe feed [18, 19], shorted-patch [20, 21] and using shorting pins [22]....

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References
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Book
15 Jan 2002
TL;DR: In this paper, the authors present an overview of the most recent advances in regular-size Dual-Frequency Antennas and their application in a wide range of applications, including: 1.1 Introduction.
Abstract: Preface. 1. Introduction and Overview. 1.1 Introduction. 1.2 Compact Microstrip Antennas. 1.3 Compact Broadband Microstrip Antennas. 1.4 Compact Dual-Frequency Microstrip Antennas. 1.5 Compact Dual-Polarized Microstrip Antennas. 1.6 Compact Circularly Polarized Microstrip Antennas. 1.7 Compact Microstrip Antennas with Enhanced Gain. 1.8 Broadband Microstrip Antennas. 1.9 Broadband Dual-Frequency and Dual-Polarized Microstrip Antennas. 1.10 Broadband and Dual-Band Circularly Polarized Microstrip Antennas. 2. Compact Microstrip Antennas. 2.1 Introduction. 2.2 Use of a Shorted Patch with a Thin Dielectric Substrate. 2.3 Use of a Meandered Patch. 2.4 Use of a Meandered Ground Plane. 2.5 Use of a Planar Inverted-L Patch. 2.6 Use of an Inverted U-Shaped or Folded Patch. 3. Compact Broadband Microstrip Antennas. 3.1 Introduction. 3.2 Use of a Shorted Patch with a Thick Air Substrate. 3.3 Use of Stacked Shorted Patches. 3.4 Use of Chip-Resistor and Chip-Capacitor Loading Technique. 3.5 Use of a Slot-Loading Technique. 3.6 Use of a Slotted Ground Plane. 4. Compact Dual-Frequency and Dual-Polarized Microstrip Antennas. 4.1 Introduction. 4.2 Some Recent Advances in Regular-Size Dual-Frequency Designs. 4.3 Compact Dual-Frequency Operation with Same Polarization Planes. 4.4 Compact Dual-Frequency Operation. 4.5 Dual-Band or Triple-Band PIFA. 4.6 Compact Dual-Polarized Designs. 5. Compact Circularly Polarized Microstrip Antennas. 5.1 Introduction. 5.2 Designs with a Cross-Slot of Unequal Arm Lengths. 5.3 Designs with a Y-Shaped Slot of Unequal Arm Lengths. 5.4 Designs with Slits. 5.5 Designs with Spur Lines. 5.6 Designs with Truncated Corners. 5.7 Designs with Peripheral Cuts. 5.8 Designs with a Tuning Stub. 5.9 Designs with a Bent Tuning Stub. 5.10 Compact CP Designs with an Inset Microstrip-Line Feed. 6. Compact Microstrip Antennas with Enhanced Gain. 6.1 Introduction. 6.2 Compact Microstrip Antennas with High-Permittivity Superstrate. 6.3 Compact Microstrip Antennas with Active Circuitry. 7. Broadband Microstrip Antennas. 7.1 Introduction. 7.2 Use of Additional Microstrip Resonators. 7.3 Microstrip Antennas with an Air Substrate. 7.4 Broadband Slot-Loaded Microstrip Antennas. 7.5 Broadband Microstrip Antennas with an Integrated Reactive Loading. 7.6 Broadband Microstrip Antennas with Reduced Cross-Polarization Radiation. 8. Broadband Dual-Frequency and Dual-Polarized Microstrip Antennas. 8.1 Introduction. 8.2 Broadband Dual-Frequency Microstrip Antennas. 8.3 Broadband Dual-Polarized Microstrip Antennas. 9. Broadband and Dual-Band Circularly Polarized Microstrip Antennas. 9.1 Introduction. 9.2 Broadband Single-Feed Circularly Polarized Microstrip Antennas. 9.3 Broadband Two-Feed Circularly Polarized Microstrip Antennas. 9.4 Broadband Four-Feed Circularly Polarized Microstrip Antennas. 9.5 Dual-Band Circularly Polarized Microstrip Antennas. Index.

1,734 citations


"Circular Microstrip Patch Loaded Wi..." refers background in this paper

  • ...Moreover, most of those designs suffer from various distortions in radiation patterns, high cross-polarized levels, and decrease in efficiency [4]....

    [...]

  • ...I N recent years, coax-fed microstrip patches loaded with shorted pins have been investigated for achieving small or reduced size antennas [1]–[4]....

    [...]

Journal ArticleDOI
Rod Waterhouse1
TL;DR: In this paper, the advantages of microstrip patch technology over its competitors is its low profile and hence small volume, and the relative ease in which it can be connected to the feed network, as was highlighted in Chapter 2.
Abstract: As stated in Chapter 1, one of the many advantages of microstrip patch technology over its competitors is its low profile and hence small volume. Another key advantage of this printed antenna is the relative ease in which it can be connected to the feed network, as was highlighted in Chapter 2. For these reasons antenna design engineers deduced that microstrip patch antennas could be utilized for applications requiring where there was very limited space to mount the antenna. One such global application is for wireless communication handset terminals.

399 citations


"Circular Microstrip Patch Loaded Wi..." refers background in this paper

  • ...I N recent years, coax-fed microstrip patches loaded with shorted pins have been investigated for achieving small or reduced size antennas [1]–[4]....

    [...]

  • ...In those designs, single [1], [2] or multiple pins [3] are located in the proximity of the feeding probe on or around the xz-plane through the patch center (see Fig....

    [...]

Journal ArticleDOI
TL;DR: Techniques to enhance the bandwidth of these antennas are presented, and valuable insight to the optimum design, namely broad bandwidth, small size, and ease of manufacturing, is given.
Abstract: Electrically small microstrip patches incorporating shorting posts are thoroughly investigated. These antennas are suitable for mobile communications handsets where limited antenna size is a premium. Techniques to enhance the bandwidth of these antennas are presented and performance trends are established. From these trends, valuable insight to the optimum design, namely broad bandwidth, small size, and ease of manufacturing, is given.

298 citations


"Circular Microstrip Patch Loaded Wi..." refers background in this paper

  • ...In those designs, single [1], [2] or multiple pins [3] are located in the proximity of the feeding probe on or around the xz-plane through the patch center (see Fig....

    [...]

Journal ArticleDOI
TL;DR: In this article, an improved analytical model is presented for calculating the resonant frequency of circular microstrip antennas with and without air gaps, which is widely applicable to all patch diameters-from very large to very small compared to the height of the dielectric medium below the patch.
Abstract: An improved analytical model is presented for calculating the resonant frequency of circular microstrip antennas with and without air gaps. Unlike the previous models, the present one is widely applicable to all patch diameters-from very large to very small compared to the height of the dielectric medium below the patch and also to the substrates covering the entire range of dielectric constants. The computed results for different antenna dimensions and modes of resonance are compared with the experimental values.

123 citations


"Circular Microstrip Patch Loaded Wi..." refers background in this paper

  • ...The parameter is determined as the optimum matched point on a patch with no pins [7], [8]....

    [...]

Journal ArticleDOI
19 Dec 2005
TL;DR: In this article, the authors proposed an improved design formula for circular microstrip antennas with and without an air gap between the substrate and the groundplane, where the feeding can be realized by a coaxial probe or by planar microstrip line fed at the edge.
Abstract: The input resistance at resonance of the microstrip antenna is an important parameter to be determined to design the feed and its location for achieving the optimum performance. The authors propose an improved design formula for circular microstrip to meet this requirement for both probe- and microstrip-line-fed designs. A modified admittance boundary has been applied to improve the cavity model formulation available in the open literature and the computed results are verified with several measurements showing very close approximation compared to other methods. The generalised formula is applicable to designing circular microstrip antennas with and without an airgap between the substrate and the groundplane, where the feeding can be realised by a coaxial probe or by planar microstrip line fed at the edge.

31 citations


"Circular Microstrip Patch Loaded Wi..." refers background or methods in this paper

  • ...The parameter is determined as the optimum matched point on a patch with no pins [7], [8]....

    [...]

  • ...This has been verified by changing the feed location using the formulas [7] and the simulation results....

    [...]