TY - JOUR
T1 - Waveguide Excited Microstrip Patch Antenna theory And Experiment
AU - Ho, Min Hua
AU - Michalski, Krzysztof A.
AU - Chang, Kai
N1 - Funding Information:
Manuscript received June 2, 1993; revised January 28, 1994. This work was supported in part by the Office of Naval Research under Contract "14-10-J-1197. The authors are with the Electromagnetics and Microwave Laboratory, De- partment of Electrical Engineering, Texas A&M University, College Station, TX 77843-3128 USA. IEEE Log Number 9403657.
PY - 1994/8
Y1 - 1994/8
N2 - An arbitrarily shaped microstrip patch antenna excited through an arbitrarily shaped aperture in the mouth of a rectangular waveguide is investigated theoretically and experimentally. The metallic patch resides on a dielectric substrate grounded by the waveguide flange and may be covered by a dielectric superstrate. The substrate (and superstrate, if present) consists of one or more planar, homogeneous layers, which may exhibit uniaxial anisotropy. The analysis is based on the space domain integral equation approach. More specifically, the Green's functions for the layered medium and the waveguide are used to formulate a coupled set of integral equations for the patch current and the aperture electric field. The layered medium Green's function is expressed in terms of Sommerfeld-type integrals and the waveguide Green's function in terms of Floquet series, which are both accelerated to reduce the computational effort The coupled integral equations are solved by the method of moments using vector basis functions defined over triangular subdomains. The dominant mode reflection coefficient in the waveguide and the farfield radiation patterns are then found from the computed aperture field and patch current distributions. The radar cross section (RCS) of a Planewave excited structure is obtained in a like manner. Sample numerical results are presented and are found to be in good agreement with measurements and with published data.
AB - An arbitrarily shaped microstrip patch antenna excited through an arbitrarily shaped aperture in the mouth of a rectangular waveguide is investigated theoretically and experimentally. The metallic patch resides on a dielectric substrate grounded by the waveguide flange and may be covered by a dielectric superstrate. The substrate (and superstrate, if present) consists of one or more planar, homogeneous layers, which may exhibit uniaxial anisotropy. The analysis is based on the space domain integral equation approach. More specifically, the Green's functions for the layered medium and the waveguide are used to formulate a coupled set of integral equations for the patch current and the aperture electric field. The layered medium Green's function is expressed in terms of Sommerfeld-type integrals and the waveguide Green's function in terms of Floquet series, which are both accelerated to reduce the computational effort The coupled integral equations are solved by the method of moments using vector basis functions defined over triangular subdomains. The dominant mode reflection coefficient in the waveguide and the farfield radiation patterns are then found from the computed aperture field and patch current distributions. The radar cross section (RCS) of a Planewave excited structure is obtained in a like manner. Sample numerical results are presented and are found to be in good agreement with measurements and with published data.
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U2 - 10.1109/8.310003
DO - 10.1109/8.310003
M3 - Article
AN - SCOPUS:0028484147
VL - 42
SP - 1114
EP - 1125
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
SN - 0018-926X
IS - 8
ER -