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Proceedings ArticleDOI

Unwanted Effects of Defects Used in Microstrip Antenna Designs and Possible Solutions

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.
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 "Unwanted Effects of Defects Used in..."

  • ...suppression of XP can be determined using the simulated result [21]....

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References
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01 Jan 2000
TL;DR: In this paper, a 1-dimensional defected ground unit lattice is proposed to improve the effective inductance of the cutoff and center frequency characteristics of the DGS unit lattices.
Abstract: A new one-dimensional (1-D) defected ground unit lattice is proposed in order to improve the effective inductance. In- creasing the effective inductance makes it easy to control the cutoff frequency characteristics. The proposed periodic defected ground structure (DGS) provides the excellent cutoff and stopband char- acteristics. In order to show the improved the effective inductance, three DGS circuits were fabricated with identical periodic and dif- ferent dimensions. Measurements on the fabricated DGS circuits show that the cutoff and stopband center frequency characteris- tics depend on the physical dimension of the proposed DGS unit lattice.

423 citations

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

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


"Unwanted Effects of Defects Used in..." refers methods in this paper

  • ...In this investigation, a new configuration derived from arc-DGS in [5] is proposed....

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Journal ArticleDOI
TL;DR: In this paper, the authors investigated the mutual coupling between reduced surface wave microstrip antennas and compared with that for conventional microstrip antenna and showed that for electrically thin substrates, the space-wave coupling is predominant for typical element spacing, for both the conventional and reduced surface-wave antennas.
Abstract: An investigation of the mutual coupling between reduced surface-wave microstrip antennas is presented and compared with that for conventional microstrip antennas. Numerical results are presented from a theoretical analysis of the mutual coupling along with confirming experimental results. It is shown that for electrically thin substrates, the space-wave coupling, not the surface-wave coupling, is predominant for typical element spacing, for both the conventional and reduced surface-wave antennas. In addition, the mutual coupling behavior is examined using an asymptotic analysis, which demonstrates how the coupling falls off much faster with patch separation for reduced surface wave antennas compared to conventional microstrip patch antennas.

110 citations


"Unwanted Effects of Defects Used in..." refers background or methods in this paper

  • ...This have resulted in good improvement in the front to back ratio (FBR) by about 15 dB using reduced surface wave design of microstrips [9] and 12 dB with cylindrical sidewalls [10]....

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  • ...The basic approach is the reduction in surface wave reaching the edges of the ground plane [9] and also to reduce the diffractions from the ground plane edges [10]....

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  • ...There are many investigations reported to take care of the back radiations in microstrip patches [9], [10]....

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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