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Proceedings ArticleDOI

Asymmetric defected ground structure: A new approach of suppressing cross-polarized radiations from probe fed circular patches

TL;DR: Shaped asymmetric DGS has been explored in this paper for probe fed circular microstrips for the first time right angle-bent ‘L’-shaped is one of them Another new DGS configuration conceived as "extended-arc" of asymmetric nature They are tested near 10 GHz The results presented in this paper indicate that the DGSs are effective for circular patch and do affect neither its resonance not the co-polarized radiations Among the two types, the extended-arc configuration is found to be more compact in nature Suppression in cross-p
Abstract: Shaped asymmetric DGS has been explored in here for probe fed circular microstrips for the first time Right angle- bent ‘L’-shaped is one of them Another new DGS configuration conceived as ‘extended-arc’ of asymmetric nature They are tested near 10 GHz The results presented in this paper indicate that the DGSs are effective for circular patch and do affect neither its resonance not the co-polarized radiations Among the two types, the extended-arc configuration is found to be more compact in nature Suppression in cross-polar fields in H-plane is documented by more than 20 dB near band center This is the best suppression in the XP radiation achieved so far Additionally the DGS is very compact and small in terms of the etched out area in the ground plane
Citations
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Journal ArticleDOI
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.

23 citations

Proceedings ArticleDOI
01 May 2019
TL;DR: By using defected ground system there is no further need for employing an external circuit for isolation and hence it becomes cost-effective and hence the designed antenna can be integrated into the communication devices.
Abstract: A compact 60x60x1.6mm3 antenna is being designed and simulated. The antenna structure contains two patch elements with separate ports is being introduced. Each port will resonate at different frequency. Since it has two ports, they may interfere. In order to avoid interference slots have being introduced in the ground plane. This is called Defected Ground System (DGS). The advantages of having defected ground system is for achieving size compactness and isolation. The proposed antenna can be used for mobile satellite applications. The two-port patch slot antenna is being simulated by using High Frequency Structure Simulator (HFSS) and is being implemented on a FR4 substrate. By using defected ground system there is no further need for employing an external circuit for isolation and hence it becomes cost-effective. The simulated return loss for both port is less than 10dB. The designed antenna can be integrated into the communication devices.

1 citations

Proceedings ArticleDOI
01 Dec 2018
TL;DR: In this article, an innovative design with asymmetric-arc-DGS has been explored which results in better performance over the earlier reported designs, and a novel configuration of parallel electric walls has been proposed to take care of these back radiations.
Abstract: This paper address some unwanted effect caused by the defects in the defected ground structure (DGS) integrated antennas those are popular for suppressed cross-polarized (XP) radiations. An innovative design with asymmetric-arc-DGS has been explored which results in better performance over the earlier reported designs. Some increase in the back radiation is also associated with DGS integrated antennas. A novel configuration of parallel electric walls has been proposed to take care of these back radiations. Detail investigations have been carried out at X-band using simulated results. The proposed DGS provides about 18 dB suppression in the peak XP radiations. The side-walls provides about 10 dB suppression in the radiations towards the backside of the antenna. With this configuration, the XP radiations is found to be 30 dB below the co-polarized peak over the complete azimuth range in both the principal planes.

1 citations


Cites background from "Asymmetric defected ground structur..."

  • ...Its application continues to grow in this field mainly to improve the cross-polarized (XP) isolation in the radiated fields [4] - [7]....

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  • ...The asymmetric configuration of DGS has been found very effective as the fields inside the substrate also become asymmetric due to the higher order mode [7]....

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Proceedings ArticleDOI
06 Dec 2022
TL;DR: In this article , the authors explored the characteristics of circular patch antennas using simulation results using the CST Suites Studio at a frequency of 3.3 - 3.7 GHz on the Lucite substrate.
Abstract: This study explores the characteristics of circular patch antennas. If the patch antenna generally uses natural dielectric material, the proposed circular patch antenna uses artificial dielectric material. The dielectric properties of natural materials have been modified by adding metallic layers in open and closed rings of one and two layers. This study is based on simulation results using the CST Suites Studio. Simulations were carried out at a frequency of 3.3 - 3.7 GHz on the Lucite substrate. The substrate has a relative permittivity of 3.4 and a thickness of 1.5 mm. Based on the simulation, it is obtained that a circular patch antenna with two strips of open ring metal has the widest bandwidth of 196 MHz for a return loss greater than 10 dB and the highest gain of 6.4 dBi. In addition, open ring metal has the potential to miniaturize the circular patch antenna size by up to 32.08%.
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 defected ground structur..." refers background or methods in this paper

  • ...A new technique involving defected ground structure (DGS) was proposed in 2005 [1] to improve the XP isolation of MPAs....

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  • ...As a result reduction of cross-polarized fields by 4-5 dB was reported from a circular patch at S-band [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 defected ground structur..." refers background in this paper

  • ...Sym-arc DGS is as in [4]; parameters for ‘xtnd-arc DGS: g = 2....

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  • ...The basic antenna parameters also kept unchanged as in [4]....

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  • ...In the second part of our investigation, we have explored a geometry that is a combination of the arc-DGS reported in [4] and a small extension of arc in one side that makes it asymmetric about the H-plane and improves the effectiveness....

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  • ...5 mm is kept as in the previous investigations at X-band [4], [5]....

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  • ...To get a comprehensive view, results of the folded-line and symmetricarc [4] DGSs are also included in these plots....

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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 defected ground structur..." refers background in this paper

  • ...The investigations can broadly be classified in different groups like; finding out geometries that are suitable for different geometries of MPAs; achieve more suppression in the XP radiations; reduction in the size of the DGS without compromising the performance [6], [8]; application to arrays [2], [9], etc....

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  • ...Since the inception of the concept, many research groups have put their efforts to take the concept forward and many works has been reported [2]-[9]....

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Journal ArticleDOI
TL;DR: In this article, a shape defected ground structure (DGS) that is asymmetric in a specific radiating plane of a microstrip element has been explored with a view to addressing the cross-polarization (XP) issues.
Abstract: A shaped defected ground structure (DGS) that is asymmetric in a specific radiating plane of a microstrip element has been explored with a view to addressing the cross-polarization (XP) issues. The asymmetric configuration has been conceived from an insight of the inherent asymmetry of the modal fields underneath a probe-fed microstrip patch and has been experimentally demonstrated as the best possible design compared to its predecessors in terms of the reduction in XP fields, angular span of suppression around boresight, and the space occupied by the defects. Different orientations of the defects with reference to the patches of different aspect ratio values have been thoroughly examined. More than 28-dB isolation between co-pol and cross-pol has been achieved over 190° angular range, which is indeed 140° more if compared with a conventional ground plane. Its superior characteristics with respect to the earlier designs have also been documented.

65 citations


"Asymmetric defected ground structur..." refers background in this paper

  • ...The investigations can broadly be classified in different groups like; finding out geometries that are suitable for different geometries of MPAs; achieve more suppression in the XP radiations; reduction in the size of the DGS without compromising the performance [6], [8]; application to arrays [2], [9], etc....

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  • ...A new configuration of DGS that looks like ‘L’ with its mirror image and called as folded-line DGS has been reported recently for rectangular patches of varying aspect ratios [6], [8]....

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  • ...From the earlier investigations [8] it was found that symmetricarc DGSs are more effective and this idea has been implemented by extending the ends of the arcs near the probs....

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