Radiation Characteristics of a Microstrip Patch Over an Electromagnetic Bandgap Surface

Radiation characteristics of a microstrip patch over an electromagnetic bandgap (EBG) substrate are investigated in this paper. This paper focuses on a mushroom-type EBG structure, although the design is applicable to various EBG profiles. The patch antenna is modeled as a half-wavelength resonator...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2007-06, Vol.55 (6), p.1691-1697
Main Authors: Jing Liang, Yang, H-Y.D.
Format: Article
Language:English
Subjects:
Antennas
Applied sciences
Cavity resonators
Couplings
Design engineering
Electromagnetic bandgap (EBG)
Electromagnetic radiation
Exact sciences and technology
high-impedance surface (HIS)
Joining
Metamaterials
Microstrip antennas
Microstrip lines
microstrip patch antenna
Microstrip resonators
Microstrip transmission lines
Patch antennas
periodic microstrip line
Periodic structures
Photonic band gap
Radiocommunications
Resonance
Resonators
Telecommunications
Telecommunications and information theory
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Summary:Radiation characteristics of a microstrip patch over an electromagnetic bandgap (EBG) substrate are investigated in this paper. This paper focuses on a mushroom-type EBG structure, although the design is applicable to various EBG profiles. The patch antenna is modeled as a half-wavelength resonator of an EBG-loaded microstrip transmission line. Through a full-wave eigenmode analysis of a microstrip line on an EBG structure, it is found that the resonant patch will not see a high-impedance surface (HIS), but rather it is coupled to the EBG structure as an open cavity resonator. Due to strong near-field coupling, the propagation characteristics including the bandgap zones are very different with or without the patch cover. The use of an EBG structure as a bulk material for antennas is seen inappropriate. The EBG surface is found to have the effect of reducing the patch resonant length and bandwidth. A prototype of a microstrip line proximity fed to a patch antenna is fabricated and tested to verify the analysis.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2007.898633