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Journal ArticleDOI

Defected Ground Structure toward Cross Polarization Reduction of Microstrip Patch Antenna with Improved Impedance Matching

12 Apr 2019-Radioengineering (Brno University of Technology)-Vol. 27, Iss: 1, pp 33-38
About: This article is published in Radioengineering.The article was published on 2019-04-12 and is currently open access. It has received 8 citations till now. The article focuses on the topics: Impedance matching & Reduction (complexity).

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Citations
More filters
Journal ArticleDOI
TL;DR: In this article, modified Koch fractal geometry-based patch antenna up to second iteration is implemented with partial ground configuration to achieve multiband response with wideband behavior at each of the resonating bands.
Abstract: In this article, modified Koch fractal geometrybased patch antenna up to second iteration is implemented with partial ground configuration to achieve multiband response with wideband behavior at each of the resonating bands. The antenna is designed to operate over C and X bands that can be useful for Satellite, Radar and DBS TV applications. FR-4 epoxy substrate of maximum dimension 35  30  1.6 mm (0.700  0.60  0.030) is used to simulate the antenna in HFSS 15 (0 is the free space wavelength corresponding to the lowest resonance frequency). The design is started with a truncated star shape patch and ended up with five circular slots embedded Koch fractal through several design steps. In addition, coplanar waveguide (CPW) feeding is applied to achieve multiband response and wideband behavior over each operating band. The proposed antenna exhibits multiband response at 6.06 GHz, 9.76 GHz, 10.92 GHz, 11.68 GHz and 14.4 GHz with operating bands (5.8–6.31 GHz), (9.2–10.08 GHz), (10.78–12.36 GHz) and (13.64–15 GHz) respectively. A fabricated prototype of the proposed antenna is tested using Vector Network Analyzer (VNA). It has shown adequate amount of matching between the simulation and measured results.

2 citations


Cites methods from "Defected Ground Structure toward Cr..."

  • ...Improvement in bandwidth with single band response and reduction of cross polarization using Z-shaped slot loaded ground plane is discussed in [4]....

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Journal ArticleDOI
TL;DR: In this paper , an ANN-based Substrate Integrated Waveguide Band Pass Filter (SIW BPF) is proposed, where the high pass characteristics of the SIW is converted into band pass by incorporating U slots on its top plane.
Abstract: An Artificial Neural Network (ANN) based Substrate Integrated Waveguide Band Pass Filter (SIW BPF) is proposed in this paper. A Feed Forward Back Propagation Neural Network (FF-BP NN) is utilized to optimize the filter dimensions. The Gradient Descent with Momentum and Adaptive Learning Rate algorithm is used to train the network at a learning rate of 0.01. The high pass characteristics of the SIW is converted into band pass by incorporating U slots on its top plane. Defected Ground Structure (DGS) is utilized in the bottom plane to improve the impedance matching. To validate, the prototype is fabricated using RT/Duroid 5880 and tested. The proposed filter has a center frequency at 14.68 GHz with a wide pass band from 12.92 to 16.43 GHz with a 3-dB Fractional Bandwidth (FBW) of 24%, return loss more than 20 dB and insertion loss of about 1.9 dB within the pass band. The filter has a small dimension of about 0.63 λg2, where λg is the guided wavelength at the center frequency. This filter offers wide passband, smaller size, low insertion loss, good return loss and it is useful in Ku-band satellite communication applications.

2 citations

Journal ArticleDOI
TL;DR: In this article , a coaxial feed patch antenna with a thumb-shaped defected ground structure (DGS) is proposed to simultaneously reduce the antenna size and improve the bandwidth.
Abstract: A coaxial feed patch antenna with a thumb-shaped defected ground structure (DGS) is proposed to simultaneously reduce the antenna size and improve bandwidth. The size of an antenna can be reduced by incorporating a DGS to change the electromagnetic field distribution between the patch and the ground. The proposed thumb-shaped DGS effectively widens the antenna bandwidth by generating two resonant frequencies on either side of the operating frequency, as determined by the patch length. In addition, the effect of the DGS on the ground body of a radio frequency connector is minimized by maintaining a sufficient distance between the DGS and the feed point when the connector is attached. The electromagnetic wave simulation results, which depend on the physical dimensions of the DGS, pro-vide the characteristics of the proposed antenna. The measurement results for the proposed 5.8-GHz antenna, implemented on a 1 mm FR4 printed circuit board, give an antenna gain of 4.4 dBi and a −10 dB bandwidth of 580 MHz. Compared with a conventional 5.8-GHz patch antenna implemented on the same substrate, the proposed antenna provides a 3.22-fold bandwidth improvement and 10.2% patch size reduction. passive components, power combining techniques, and high-power transmitters.

1 citations

References
More filters
Journal ArticleDOI
TL;DR: In this paper, the impedance of a rectangular patch antenna fed by an inset microstrip transmission line was measured for various feed positions and the dependence found was then compared to theoretical predictions both for this geometry and for the similar case of an INSET coaxial probe feed.
Abstract: The impedance of a rectangular patch antenna fed by an inset microstrip transmission line was measured for various feed positions. The dependence found was then compared to theoretical predictions both for this geometry and for the similar case of an inset coaxial probe feed.

125 citations

Journal ArticleDOI
TL;DR: In this paper, the application of defected ground structure (DGS) to suppress cross-polarized (XP) radiation from a microstrip patch antenna has been reinvestigated using a new DGS geometry for much improved characteristics.
Abstract: Application of defected ground structure (DGS) to suppress cross-polarized (XP) radiation from a microstrip patch antenna has been reinvestigated using a new DGS geometry for much improved characteristics. Arc-shaped defect has been used in pair, symmetrically located under a circular patch. A number of optimization parameters have been examined using simulated results, leading to a design indicating improved XP behavior. A set of identical prototypes, with and without DGS, have been experimentally studied. The presence of the DGS shows as much as 30 dB isolation of the XP level from its peak radiation, and that compared to an identical patch without DGS indicates an improvement by as much as 12 dB. The relative suppression in XP values are found to be around 7-12 dB over ±75° elevation around the boresight of the patch.

82 citations

Journal ArticleDOI
TL;DR: The resonant modes and characteristics of a rectangular microstrip with a variable air gap were theoretically and experimentally examined in this article, and the effect of varying width to length ratio was addressed and a computer aided design was presented.
Abstract: The resonant modes and characteristics of a rectangular microstrip with a variable air gap are theoretically and experimentally examined. Effect of varying width to length ratio is another important aspect addressed and a computer aided design is presented. Thorough experiments are presented, a few of which are reported for the first time. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 169–173, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24025

47 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the input impedance and radiation pattern of the inset-fed rectangular microstrip patch antenna and concluded that a shifted cosine-squared function describes well the variation of the resonant input resistance with the feed location (point of contact between the microstrip feed line and the notch) for a given patch and substrate geometry.
Abstract: The input impedance and radiation pattern of the inset-fed rectangular microstrip patch antenna are investigated. It is concluded that a shifted cosine-squared function describes well the variation of the resonant input resistance with the feed location (point of contact between the microstrip feed line and the notch) for a given patch and substrate geometry. The parameters of the shifted cosine-squared function depend on the notch width for a given patch and substrate geometry. The cross-polarization level is seen to increase as either the notch width or depth increases. However, for a fixed input resistance level, the notch depth decreases as the width increases, so that the cross-polarization level is not very sensitive to the notch width for a fixed input resistance.

44 citations