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�������պ����ѧѧ�� 2000, Vol. 26 Issue (5) :505-508    DOI:
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Numerical Analysis of Circular Aperture Antennas on Finite Planes
GAO Wen-jun, Lü Shan-wei*
Beijing University of Aeronautics and Astronautics,Dept. Of Electronic Engineering

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ժҪ ������TE11ģ������Բ����ĩ�˿������γɵ�Բ�ھ����ߵķ��䳡.�������õ�Чԭ��;���������Ƕ�����޴��������Բ�ھ��ĵ�Ч�����ֲ�,����Բ���������������ߴ�ģʽ����,���ø���Ҷ�任���������䷽��ͼ,Ȼ��Ѹ÷��䳡��Ϊ���޽ӵذ��Ե�����䳡,���ü�����������(GTD)�������޽ӵذ��Բ�ھ�����ͼ�Ĺ���,�����ڽ�ɢ�����ӽ���ɢ��������õ�Ч�������������޽ӵذ��Ӱ��,�������㹫ʽ����������,���ֽ���õ������׵���֤.
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Abstract�� The circular aperture antenna which is an open-ended circular waveguide stimulated by TE11 mode is analyzed. The method of moments is employed in conjunction with the equivalent-source technique and the modal expansion theory to analyze the open-ended circular waveguide. No restriction is imposed on the number of modes in the analysis. The problem of radiation from a circular aperture antenna embedded in an infinite ground plane is solved at first. Then expressions which represent the elevation-plane patterns of the antenna embedded in a finite ground plane are derived using GTD(Geometrical Theory of Diffraction). The expressions for the field pattern are obtained by superposing the infinite ground plane solutions, the first-order diffracted field solutions and the axial caustic solutions in their respective regions of validity.
Keywords�� microwave antennas   antenna directional patterns   waveguides   moment method   GTD     
Received 1999-04-21;
About author: ���ľ�(1973-),��,���ɹź�����,��ʿ��,100083,����.
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���ľ�, ����ΰ.����ƽ����Բ�ھ����䳡����ֵ����[J]  �������պ����ѧѧ��, 2000,V26(5): 505-508
GAO Wen-jun, L�� Shan-wei.Numerical Analysis of Circular Aperture Antennas on Finite Planes[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2000,V26(5): 505-508
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