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Journal ArticleDOI

Asymmetric and Compact DGS Configuration for Circular Patch With Improved Radiations

01 Feb 2020-IEEE Antennas and Wireless Propagation Letters (IEEE)-Vol. 19, Iss: 2, pp 355-357
TL;DR: In this paper, an improved tuning of defected ground structure geometries for circular patch with twofold objective: to minimize the defect size by strategic shaping and deployment and, at the same time, to maintain the highest order of achievable suppression of cross-polarized (XP) radiations.
Abstract: This letter explores improved tuning of defected ground structure (DGS) geometries for circular patch with twofold objective: to minimize the defect size by strategic shaping and deployment and, at the same time, to maintain the highest order of achievable suppression of cross-polarized (XP) radiations. Relative merits and demerits of the earlier designs have been accounted for, to justify the need of further comprehensive improvement. The DGS dimensions in several cases appear as a limiting factor, especially in arrays. This letter resolves the same and reduces the size by at least 35%. Asymmetrically configured designs have been emphasized with a view to addressing the asymmetry in modal fields. They are examined in X -band and experimentally verified with a promise to achieve 16–18 dB XP suppression over H -plane, which, to the best of authors’ knowledge, is the maximum reported suppression so far.
Citations
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Journal ArticleDOI
TL;DR: In this article, the authors proposed a DGS-based solution to the problem of excess backside radiation caused by the cross-polarized (XP) fields, which is being faced by all defected ground structure (DGS) integrated patches.
Abstract: This letter addresses a practical issue of excess backside radiation caused by the cross-polarized (XP) fields, which is being faced by all defected ground structure (DGS) integrated patches. Defects or slots on the ground plane (GP) suppresses the H -plane XP fields. These strategic slots cause leakage of XP fields toward the backside of the antenna. This letter, for the first time, explores the physical insight behind this phenomenon with an aim to find a solution. Engineering on the backside of the GP has been conceived and systematically developed in the form of a pair of electric walls with varied geometries. Serrated comb-shaped geometry has been proposed finally. A thorough DGS-based design along with its experimental validation in the X -band ensures a reduction in XP radiation nearly by 10 dB in the backside maintaining its front-side reduction by 16–18 dB. This also reduces the usual backward radiation originated from the copolarized fields. Although the GP engineering makes the structure nonplanar, its advanced features may find potential applications where significantly low XP standalone antennas are required, such as wireless base stations, to onboard satellite systems.

10 citations


Cites background from "Asymmetric and Compact DGS Configur..."

  • ...(b) H-plane XP patterns with and without DGS [9] at the resonant frequency; parameters: r = 5, ρ = 1....

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  • ...The approach aims to reduce cross-polarized (XP) radiations and the design has been improved over the years ensuring co- to XP isolation of 15–18 dB [2]–[9]....

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  • ...Table I summarizes the radiation features obtained in the earlier studies [2], [5], [9] and it helps understanding a specific inherent issue....

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  • ...“Asymmetric-arc DGS” [9], as shown in Fig....

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  • ...But the backside radiation due to XP fields increases that becomes significant for the linear [5] and asymmetric arc [9] DGSs around elevation angle ≈ 135°....

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Journal ArticleDOI
TL;DR: In this article , a low-profile dual-band pixelated defected ground antenna has been proposed at 3.5 GHz, 5.2 GHz and 5.8 GHz bands.
Abstract: Abstract A low-profile dual-band pixelated defected ground antenna has been proposed at 3.5 GHz and 5.8 GHz bands. This work presents a flexible design guide for achieving single-band and dual-band antenna using pixelated defected ground (PDG). The unique pixelated defected ground has been designed using the binary particle swarm optimization (BPSO) algorithm. Computer Simulation Technology Microwave Studio incorporated with Matlab has been utilized in the antenna design process. The PDG configuration provides freedom of exploration to achieve the desired antenna performance. Compact antenna design can be achieved by making the best use of designated design space on the defected ground (DG) plane. Further, a V-shaped transfer function based on BPSO with fast convergence allows us to efficiently implement the PDG technique. In the design procedure, pixelization is applied to a small rectangular region of the ground plane. The square pixels on the designated defected ground area of the antenna have been formed using a binary bit string, consisting of 512 bits taken during each iteration of the algorithm. The PDG method is concerned with the shape of the DG and does not rely on the geometrical dimension analysis used in traditional defected ground antennas. Initially, three single band antennas have been designed at 3.5 GHz, 5.2 GHz and 5.8 GHz using PDG technique. Finally, same PDG area has been used to design a dual-band antenna at 3.5 GHz and 5.8 GHz. The proposed antenna exhibits almost omnidirectional radiation performance with nearly 90% efficiency. It also shows dual radiation pattern property with similar patterns having different polarizations at each operational band. The antenna is fabricated on a ROGERS RO4003 substrate with 1.52 mm thickness. Reflection coefficient and radiation patterns are measured to validate its performance. The simulated and measured results of the antenna are closely correlated. The proposed antenna is suitable for different applications in Internet of Things.

2 citations

Journal ArticleDOI
TL;DR: In this article, a novel and compact 180° circular sector microstrip antenna has been proposed to suppress cross-polar (XP) radiations over the whole elevation without hampering its radiation pattern and bandwidth.
Abstract: In this letter, a novel and compact 180° circular sector microstrip antenna has been proposed. The patch surface has been designed with a proper design insight to perturb and control the orthogonal surface current paths and orthogonal field components at the truncated edges for suppression of cross-polar (XP) radiations over the whole elevation without hampering its radiation pattern and bandwidth. The proposed antenna gives consistently better performance with different (large, medium, and small) ground plane sizes in spite of massive miniaturization (of 82%) with reference to conventional circular microstrip antenna at the same frequency. The proposed antenna can also be circumscribed completely within a sphere of radius (λ/2π), i.e., wheeler limit and hence can stand well as a small antenna.

1 citations

Journal ArticleDOI
TL;DR: In this article , a thorough analysis of slotted ground plane (SGP)-based resonators designed for wireless power transfer (WPT) applications is reported, and some new findings that relate a resonator and WPT performance metrics to the slot shape, quality factor, and radiation loss are presented in a very comprehensive manner.
Abstract: A thorough analysis of slotted ground plane (SGP)-based resonators designed for wireless power transfer (WPT) applications is reported in this paper. For the first time, some new findings that relate a resonator and WPT performance metrics to the slot shape, quality factor (Q), and radiation loss are presented in a very comprehensive manner. As a case study, a single-loop polygonal shape was considered to carry out all analyses and investigations. It has been identified that the slot shape has no impact on the performance of resonators and, hence, developed WPT. Instead, the performance is hugely dependent on Q of resonators regulated by the chosen slot area. These findings allow the conceptualization of systematic analysis of WPT systems and the development of design schemes that are readily realizable, and they also enable significant improvement in power transfer efficiency (PTE). The developed prototypes conforming to the industrial, scientific, and medical frequency bands show an enhancement in PTE to the extent of 11% during the measurements. The proposed analysis and design approach are very important steps in advancing state-of-the-art radio-frequency WPTs. In essence, this has the potential to reinvigorate the stagnated SGP-based WPT systems so as to facilitate the requirements of low-power applications.
References
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Journal ArticleDOI
TL;DR: In this article, a defected ground structure (DGS) pattern is proposed to reduce the cross-polarized (XP) radiation of a microstrip patch antenna, which is simple and easy to etch on a commercial microstrip substrate.
Abstract: A defected ground structure (DGS) is proposed to reduce the cross-polarized (XP) radiation of a microstrip patch antenna. The proposed DGS pattern is simple and easy to etch on a commercial microstrip substrate. This will only reduce the XP radiation field without affecting the dominant mode input impedance and co-polarized radiation patterns of a conventional antenna. The new concept has been examined and verified experimentally for a particular DGS pattern employing a circular patch as the radiator. Both simulation and experimental results are presented.

275 citations


"Asymmetric and Compact DGS Configur..." refers background in this paper

  • ...D EFECTED ground structures (DGSs) have been playing an instrumental role in reducing the cross-polarized (XP) radiation of microstrip patches since its inception in 2005 [1]....

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Journal ArticleDOI
TL;DR: In this article, the authors investigated the effect of defected ground structure (DGS) on cross-polarized (XP) electric fields and associated radiations and found that the arc-DGS appears to be highly efficient in terms of suppressing XP fields.
Abstract: Experiments with probe-fed circular patches using conventional and defected ground planes flashed some interesting features relating to cross-polarized (XP) electric fields and associated radiations before the present authors. Those led to a series of new investigations for understanding the nature of XP fields and to deal with them using defected ground structure (DGS) for improved XP performance. In the first phase of investigation, the XP radiations of a probe-fed circular patch with conventional ground plane have been critically studied as a function of the radial probe location. Remarkably significant effect is experimentally demonstrated. New information about orthogonal resonant fields and its importance in designing an antenna is provided. In the second phase of investigation, limitations of dot-shaped DGS in reducing XP level are experimentally studied. As its improved variants, two new DGS geometries such as annular ring and circular arcs have been explored. The arc-DGS appears to be highly efficient in terms of suppressing XP fields. Suppression by 10-12 dB has been experimentally demonstrated. Each design has been experimented in both C- and X-bands to earn confidence on the measured data.

114 citations


"Asymmetric and Compact DGS Configur..." refers background or methods or result in this paper

  • ...Simulated H-plane radiations of circular patches at resonance using sym-arc, xtnd-arc, asym-arc [4], and linear [7] DGSs....

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  • ...Search for their compact geometries is another area of focus [4]–[9]....

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  • ...Such shortcoming was overcome by arc-shaped defects in [4]....

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  • ...microstrips, 8–9 dB suppression was achieved by symmetric arc-shaped DGS [4], and they were nonresonant at the operating frequencies....

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  • ...They provide about 20 dB suppression in the XP level, which is significantly improved compared with the previously obtained results with symmetric arc- or symmetricring defects [4]....

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Journal ArticleDOI
TL;DR: In this paper, a defect ground structure (DGS)-integrated rectangular microstrip patch has been experimentally investigated with an aim to improve polarisation purity in radiated fields.
Abstract: Defected ground structure (DGS)-integrated rectangular microstrip patch has been experimentally investigated with an aim to improve polarisation purity in radiated fields. Width to length ratio (aspect ratio) of a patch attributes different characteristic features. Therefore present experimental studies have been executed for four different aspect ratio values like 1.6, 1.3, 1.0 and 0.8. Folded defects have been employed in H-plane. Possibility of achieving high polarisation purity (over 25 dB isolation between co- to cross-polarised fields) with improved impedance bandwidth has been demonstrated. The variation in XP fields as a function of the patch aspect ratio has been investigated and a strong physical insight into the modal fields with and without DGS has been developed.

82 citations

Journal ArticleDOI
TL;DR: In this paper, a simple rectangular microstrip antenna on slot-type defected ground plane is proposed for reduced cross-polarized (XP) radiation and justified theoretically, which will reduce the XP radiation field compared to a conventional micro-strip antenna without affecting its copolarised (CP) radiation characteristics.
Abstract: A simple rectangular microstrip antenna on slot-type defected ground plane is proposed for reduced cross-polarized (XP) radiation and justified theoretically. This will reduce the XP radiation field compared to a conventional microstrip antenna without affecting its copolarized (CP) radiation characteristics.

69 citations

Journal ArticleDOI
TL;DR: In this paper, a hexagonal shape defected ground structure (DGS) implemented on two element triangular patch microstrip antenna array was used to improve the radiation performance of the antenna.
Abstract: This paper presents a hexagonal shape defected ground structure (DGS) implemented on two element triangular patch microstrip antenna array. The radiation performance of the antenna is characterized by varying the geometry and dimension of the DGS and also by locating the DGS at specific position which were simulated. Simulation and measurement results have verified that the antenna with DGS had improved the antenna without DGS. Measurement results of the hexagonal DGS have axial ratio bandwidth enhancement of 10 MHz, return loss improvement of 35%, mutual coupling reduction of 3 dB and gain enhancement of 1 dB.

67 citations


"Asymmetric and Compact DGS Configur..." refers background in this paper

  • ...Several designs, reported so far, had attained up to 10–15 dB suppression in the H-plane XP fields by perturbing the higher order modes [2]–[11]....

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