A back lobe reduction of aperture coupled microstrip antenna using DGS

Alias, H.; Ali, M. T.; Ramli, S. Subahir N.; Sulaiman, Muhammad Azwan; Kayat, S.

doi:10.1109/ecticon.2013.6559514

Cited by 10 publications

(5 citation statements)

References 4 publications

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“…In SMSA design, the maximum difference between the front lobe and back lobe levels is noted over the complete BW. In MSA using a finite ground plane, the back lobe radiation is attributed to the diffraction of the electromagnetic energy from the edges of the ground plane as well as due to the excitation of surface waves [23][24][25][26][27]. The bow-tie shape ground plane profile minimizes the diffraction and surface wave excitation effects and thus focuses the energy in the forward direction.…”

Section: Regular Shape Msas Using H-shape Ground Planementioning

confidence: 99%

Wideband Designs of Regular Shape Microstrip Antennas Using Modified Ground Plane

Chavali¹,

Deshmukh²

2021

PIER C

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Wideband designs of proximity fed regular shape microstrip antennas using bow-tie and H-shape ground plane profiles are proposed in the 1000 MHz frequency range. The modified ground plane alters the quality factor of the patch cavity which enhances the impedance bandwidth. In terms of the results obtained for the bandwidth and gain together, circular and square patches backed by bow-tie shape ground plane, followed by circular patch backed by H-shape ground plane yield optimum results. For substrate thickness of 0.097λ g , against the conventional ground plane, bow-tie shape gives 12% and 24% bandwidth increment for the circular and square patches, respectively, and H-shape ground plane yields bandwidth increment by 17% in the circular patch. All these wideband designs offer a peak gain around 6 dBi with a broadside radiation pattern. Further, a modified ground plane profile helps in optimizing the proximity fed antennas on lower substrate thicknesses. Amongst all the configurations, for ∼ 0.03λ g reduction in the substrate thickness, square microstrip antenna using bow-tie shape ground plane yields 19% increase in the impedance bandwidth against the equivalent thicker substrate design with a peak broadside gain of above 6 dBi. Thus, the proposed modified ground plane antennas yield bandwidth improvement but for a smaller substrate thickness.

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Section: Regular Shape Msas Using H-shape Ground Planementioning

confidence: 99%

Wideband Designs of Regular Shape Microstrip Antennas Using Modified Ground Plane

Chavali¹,

Deshmukh²

2021

PIER C

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“…A slot or any other defected ground structure (DGS) impedes the propagation of electromagnetic waves by disturbing the current distribution on ground plane. [10][11][12][13][14] The DGS techniques have been studied extensively for planar antennas. However, no such study has been done for the combination of DR element, and the ground plane slot, to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

“…The combination of DR element and the ground plane slots results in frequency plus isolation reconfiguration as well as it helps to obtain a large tuning range. A slot or any other defected ground structure (DGS) impedes the propagation of electromagnetic waves by disturbing the current distribution on ground plane 10‐14 . The DGS techniques have been studied extensively for planar antennas.…”

Section: Introductionmentioning

confidence: 99%

A compact MIMO DRA with simultaneous frequency and isolation reconfiguration

Aqeel

Khan

et al. 2020

Micro & Optical Tech Letters

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The frequency and an isolation reconfigurable multiple input multiple output (MIMO) dielectric resonator antenna (DRA) is presented in this communication. The design employs a low-profile rectangular DR element with ground plane having cross shape slots. The slots resonance is effectively combined with the DR-resonance for size miniaturization. Moreover, the slot responds as defected ground structure (DGS) for the DR element upon placement of PIN diodes. Switching amalgam of diodes results in frequency, isolation reconfigurability and resonates the structure in three distinct configurations covering PCS 1900 MHz, Wimax 2.3 GHz, and LTE 2500-2700 MHz bands. A thorough parametric study was performed to study the effects of cross shape DGS on the antenna parameters. The prototype of the proposed MIMO antenna is fabricated and results were measured to certify the simulated results. Few parameters of MIMO such like diversity gain (DG), envelope correlation coefficient (ECC), and mean effective gain (MEG) are provided to verify the MIMO performance.

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“…Another alternative to eliminate higher-order modes is to disturb the structure of the ground plane of the antenna by attaching defects, a technique known as defect ground-plane (DGS) structure. When they are used under proper conditions, DGSs can control the excitation and propagation of electromagnetic waves in the substrate of the antenna [2,3]. This property explains why this technique has been used to suppress harmonic radiation.…”

Section: Introductionmentioning

confidence: 99%

Harmonic suppression using optimised hexagonal defected ground structure by genetic algorithm

Sena

Silva

2018

IET Microwaves, Antennas & Propagation

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This study analyses the effects caused by a new hexagonal defect ground‐plane (DGS) structure when it is applied to a rectangular microstrip antenna and studies its effectiveness to suppress higher‐order modes. To improve the rejection characteristics of the analysed DGS, a genetic algorithm was used to optimise its parameters. Controlling higher‐order modes of the fundamental operating frequency was successfully demonstrated, and the experimental results showed that optimising the hexagonal DGS could enhance the S11 parameter of the fundamental mode while simultaneously suppressing or further attenuating higher‐order modes. Such results are particularly important once DGS is applied for self‐immunity of antennas against harmonic radiations by avoiding the use of a filter circuit.

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A back lobe reduction of aperture coupled microstrip antenna using DGS

Cited by 10 publications

References 4 publications

Wideband Designs of Regular Shape Microstrip Antennas Using Modified Ground Plane

Wideband Designs of Regular Shape Microstrip Antennas Using Modified Ground Plane

A compact MIMO DRA with simultaneous frequency and isolation reconfiguration

Harmonic suppression using optimised hexagonal defected ground structure by genetic algorithm

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