Journal ArticleDOI
Reflection phase characterizations of the EBG ground plane for low profile wire antenna applications
Fan Yang,Yahya Rahmat-Samii +1 more
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TLDR
In this article, the authors focus on the reflection phase feature of EBG surfaces, which can be used to identify the input-match frequency band inside of which a low profile wire antenna exhibits a good return loss.Abstract:
Mushroom-like electromagnetic band-gap (EBG) structures exhibit unique electromagnetic properties that have led to a wide range of electromagnetic device applications. This paper focuses on the reflection phase feature of EBG surfaces: when plane waves normally illuminate an EBG structure, the phase of the reflected field changes continuously from 180/spl deg/ to -180/spl deg/ versus frequency. One important application of this feature is that one can replace a conventional perfect electric conductor (PEC) ground plane with an EBG ground plane for a low profile wire antenna design. For this design, the operational frequency band of an EBG structure is defined as the frequency region within which a low profile wire antenna radiates efficiently, namely, having a good return loss and radiation patterns. The operational frequency band is the overlap of the input-match frequency band and the surface-wave frequency bandgap. It is revealed that the reflection phase curve can be used to identify the input-match frequency band inside of which a low profile wire antenna exhibits a good return loss. The surface-wave frequency bandgap of the EBG surface that helps improve radiation patterns is very close to its input-match frequency band, resulting in an effective operational frequency band. In contrast, a thin grounded slab cannot work efficiently as a ground plane for low profile wire antennas because its surface-wave frequency bandgap and input-match frequency band do not overlap. Parametric studies have been performed to obtain design guidelines for EBG ground planes. Two novel EBG ground planes with interesting electromagnetic features are also presented. The rectangular patch EBG ground plane has a polarization dependent reflection phase and the slotted patch EBG ground plane shows a compact size.read more
Citations
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Journal ArticleDOI
Surface‐wave bandgap of polarization dependent electromagnetic bandgap structures
Yunqi Fu,Naichang Yuan +1 more
TL;DR: In this article, the surface-wave bandgap of this polarization-dependent EBG structure has been investigated and it has been shown that the surface wave bandgap along two periodic directions almost overlaps and compactness in one direction could be achieved by increase the length of the other.
Proceedings ArticleDOI
A Novel Approach to Enhance the Bandwidth of Mushroom-like EBG Structures
TL;DR: A novel design of mushroom-like EBG structure is obtained and simulated, which exhibit distinctly wider bandwidth than the conventional one, which is approved to have a obviously wider bandwidth comparing to those of conventional (or uniform) one.
Proceedings ArticleDOI
Evaluation the effectiveness of the infrared flare with a tactic of dispensing in burst
YiFan Hu,BiFeng Song +1 more
TL;DR: In this article, the authors evaluate the effectiveness of infrared (IR) flare against an IR missile with a tactic of dispensing in burst, and the results show that to achieve effective decoy on IR missile, the flares could be dispensed automatically at an optimum time interval, which is slightly smaller than flare burn time, or dispensed manually in the effective dispensing region at time interval near zero.
Proceedings ArticleDOI
Effects of Frequency Selective Surface (FSS) on Enhancing the Radiation Efficiency of Metal-Surface Mounted Dipole Antenna
TL;DR: In this article, a novel design approach based on transmission characteristics of transverse magnetic (TM) and transverse electric (TE) surface wave across the FSS is presented, which is experimentally verified with a two-port network analyzer.
Proceedings ArticleDOI
Application of EBG and DGS structure on antenna array
TL;DR: In this paper, the reflected phase method and suspended microstrip line method are used to respectively measure the stop band of EBG structures and a DGS, which can help to optimize the performance of antenna array.
References
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