Microstrip radiating structures: Theoretical and experimental investigations executed in recent years at the University of Calcutta
01 Dec 2007-pp 1-4
TL;DR: In this article, a comprehensive review of research on microstrip antennas conducted at the Institute of radio physics and electronics, University of Calcutta with an emphasis to those done in recent years is presented.
Abstract: In this paper, we have presented a comprehensive review of research on microstrip antennas conducted at the Institute of radio Physics and Electronics, University of Calcutta with an emphasis to those done in recent years.
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Dissertation•
15 Nov 2013
TL;DR: In this paper, the authors propose a topology of cellules de phaseuses, passives, and reconfigurables, which permettent, tout en conservant une relative simplicite de realisation, doffrir a large bande passante.
Abstract: Les reseaux reflecteurs imprimes connaissent un fort developpement depuis la fin des annees 80. Ce type d’antenne offre la possibilite de former des diagrammes de rayonnement complexes avec une relative simplicite, un faible cout de realisation, de faibles pertes et un volume reduit. Cependant, il souffre encore de quelques defauts : - La non regularite de la geometrie de la cellule sur la surface du reseau, dans le cas d’une antenne passive, peut engendrer des degradations sur le diagramme de rayonnement, surtout a la transition entre deux geometries extremes, lorsqu’un nouveau cycle de phase commence. - Le nombre relativement eleve de composants utilises pour controler la phase de l’onde reflechie, dans le cas d’une antenne reconfigurable, augmente le cout de fabrication de l’antenne et complexifie le circuit de commande des elements reconfigurables. - La limitation en bande passante, qui a longtemps cantonne ce type d’antenne a des applications bande etroite, est principalement liee au comportement de la cellule unitaire constitutive du reseau. Dans cette these, nous nous interessons donc a la conception de nouvelles topologies de cellules dephaseuses, passives et surtout reconfigurables, qui permettent, tout en conservant une relative simplicite de realisation, d’offrir une large bande passante. De plus, le controle de la phase, dans le cas des cellules reconfigurables, doit etre realise avec un nombre reduit de composants afin de respecter la contrainte de faible cout de fabrication.
4 citations
References
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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
"Microstrip radiating structures: Th..." refers methods in this paper
...In [38] we introduce simple defects printed on the ground plane in the form of two circular slots each of same diameter etched on the ground plane....
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TL;DR: In this article, an improved analytical model is presented for calculating the resonant frequency of circular microstrip antennas with and without air gaps, which is widely applicable to all patch diameters-from very large to very small compared to the height of the dielectric medium below the patch.
Abstract: An improved analytical model is presented for calculating the resonant frequency of circular microstrip antennas with and without air gaps. Unlike the previous models, the present one is widely applicable to all patch diameters-from very large to very small compared to the height of the dielectric medium below the patch and also to the substrates covering the entire range of dielectric constants. The computed results for different antenna dimensions and modes of resonance are compared with the experimental values.
123 citations
Additional excerpts
...ground plane and the substrate [1]-[3]....
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TL;DR: In this paper, a defected ground structure (DGS) consisting of concentric circular rings in different configurations is experimentally studied to examine the stopband characteristics, and a metallic shielding is introduced at the back of the DGS to suppress any leakage or radiation.
Abstract: A new defected ground structure (DGS) consisting of concentric circular rings in different configurations is experimentally studied to examine the stopband characteristics. Unlike previous DGS designs, a metallic shielding is introduced at the back of the DGS to suppress any leakage or radiation, and this would be advantageous for microwave circuit applications. A wide stopband is demonstrated with a set of prototypes designed for X-band. Its application to suppressing mutual coupling in microstrip patch arrays is demonstrated
110 citations
"Microstrip radiating structures: Th..." refers background in this paper
...Another defected ground structure consisting of concentric circular rings in different configurations useful for microwave circuit applications is experimentally studied in [39],[40]....
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TL;DR: In this article, the resonance frequency of coax-fed circular microstrip antennas with and without air gaps has been modeled (in its Section III) by incorporating and rearranging some results previously reported by others.
Abstract: For original paper by Abboud et al. see IEEE Trans. Antennas Propagat., vol.38, p.1882-5 (1990). In the original paper, the resonance frequency of coax-fed circular microstrip antennas with and without air gaps has been modeled (in its Section III) by incorporating and rearranging some results previously reported by others. The present author, while working with the formulas of that Section III noticed a discrepancy in (8) and (9). This has been investigated thoroughly and the observations are presented. A brief reply is given by Damiano et al.
109 citations
TL;DR: A simple design formulation to compute accurate resonant frequencies of circular microstrip antennas covered with dielectric superstrates that shows the closest approximation with the measurements revealing average percent error as low as 0.52%.
Abstract: A simple design formulation to compute accurate resonant frequencies of circular microstrip antennas covered with dielectric superstrates is proposed. It alleviates the rigorous mathematical analyzes and large computational time of some earlier works. This theory is widely applicable to both high and low dielectric constant superstrates as verified with the experiments and other theoretical models. Of all theories, the present one shows the closest approximation with the measurements revealing average percent error as low as 0.52%. The extension of this formulation to predict the accurate design data for conventional microstrip circular antennas are also verified with different experiments and available improved theories for various sets of antenna parameters.
83 citations
"Microstrip radiating structures: Th..." refers background in this paper
...An accurate cavity model formulation for the resonant frequencies is proposed in [25],[26]....
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