Title :
An experimental technique used to measure the unloaded Q of microstrip antennas
Author :
Weiss, S.J. ; Kahn, W.K.
Author_Institution :
Dev. & Eng. Center, US Army Armament Res., Adelphi, MD, USA
Abstract :
We present a scattering method for measuring the unloaded Q of a prototype microstrip (patch) antenna structure without the need to implement connecting circuitry. The patch antenna is placed on a large reflecting ground plane. Two auxiliary antennas are used. Antenna number 1 acts as a transmitting antenna and is oriented at an angle of approximately 45/spl deg/ with respect to the x-y plane. Antenna number 2 acts as a receiving antenna and is oriented along the z-direction normal to the ground plane directly above the patch antenna. This orientation places it in a near minimum of the specular beam. Both antennas are properly polarized with respect to the desired radiation field of the patch antenna. Ideally, such a measurement system would be placed in an electromagnetic anechoic chamber.
Keywords :
Q-factor measurement; antenna radiation patterns; antenna testing; electromagnetic wave polarisation; electromagnetic wave reflection; electromagnetic wave scattering; microstrip antennas; receiving antennas; transmitting antennas; EM wave polarisation; auxiliary antennas; electromagnetic anechoic chamber; experimental technique; large reflecting ground plane; measurement system; microstrip antennas; patch antenna; radiation field; receiving antenna; scattering method; specular beam; transmitting antenna; unloaded Q measurement; Antenna measurements; Circuits; Electromagnetic scattering; Joining processes; Microstrip antennas; Patch antennas; Prototypes; Q measurement; Receiving antennas; Transmitting antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1996. AP-S. Digest
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-3216-4
DOI :
10.1109/APS.1996.549573
