Journal ArticleDOI
Resonant frequency of circular microstrip antennas with and without air gaps
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TLDR
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.read more
Citations
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Journal ArticleDOI
Microstrip Patch Antenna With Defected Ground Structure for Cross Polarization Suppression
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.
Journal ArticleDOI
Isolation Enhancement for MIMO Patch Antennas Using Near-Field Resonators as Coupling-Mode Transducers
TL;DR: In this article, a novel decoupling technique for closely packed patch antennas using near-field resonator (NFR) above each antenna element is proposed, which can be easily applied to multiple-input multiple-output (MIMO) antennas having multiple patch elements.
Journal ArticleDOI
Investigations into a cavity-backed circular-patch antenna
TL;DR: In this article, an empirical formula for resonant frequency of a circular cavity-enclosed circular patch antenna is tested with measured results, and the patch miniaturization in the presence of the cavity is proved.
Journal ArticleDOI
Concentric Ring-Shaped Defected Ground Structures for Microstrip Applications
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.
Journal ArticleDOI
Circularly-Polarized Wide Slot Antenna Loaded With a Parasitic Patch
Jeen-Sheen Row,Shiao-Wen Wu +1 more
TL;DR: In this article, a broadband circularly-polarized (CP) slot antenna is described and its key parameters are investigated to show how to couple the two CP modes and achieve impedance matching, and the effects of the distance between the parasitic patch and wide slot on the CP bandwidth and antenna gain are also discussed.
References
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Journal ArticleDOI
Circularly polarised microstrip antenna with a tuning stub
Kin-Lu Wong,Yi-Fang Lin +1 more
TL;DR: In this paper, a simple circular polarisation (CP) design of microstrip antennas using a tuning stub is proposed and studied, and it is also demonstrated that, by applying this CP design method to a circular microstrip patch with a cross slot having equal slot lengths, a compact circularly-polarised microstrip antenna can easily be implemented, with much more relaxed manufacturing tolerances as compared to the case of using a cross-slot of unequal slot lengths.
Journal ArticleDOI
Comments on "A new model for calculating the input impedance of coax-fed circular microstrip antennas with and without air gaps" [with reply]
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.
Journal ArticleDOI
Theory and experiment on microstrip antennas with airgaps
J. S. Dahele,Kai-Fong Lee +1 more
TL;DR: In this article, the authors present a comprehensive report on microstrip antennas with air gap between the substrate and the ground plane, and compare theoretical and experimental results with the results obtained by introducing an air gap in (i) circular-discs, (ii) annular-rings and (iii) dual-frequency stacked-disc antennas.
Journal ArticleDOI
A novel active antenna with self-mixing and wideband varactor-tuning capabilities for communication and vehicle identification applications
C.M. Montiel,Lu Fan,Kai Chang +2 more
TL;DR: In this paper, a cavity-backed, Gunn-diode-driven, self-mixing active inverted stripline circular patch antenna has been developed, which provides good radiation performance with cross-polarization levels 18 dB below copolarization at boresight.