Title :
Quasi-optical phase modulators
Author :
Markovic, Marko ; Hollung, S. ; Popovic, Z.B.
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA
Abstract :
Three X-band quasi-optical transmission type phase modulators are presented: a varactor loaded grid with 25/spl deg/ continuous phase shift; a p-i-n diode loaded grid with digital phase shifts of 0/spl deg/ and 90/spl deg/; and a transistor antenna array with 0/spl deg/ and 180/spl deg/ phase states. All of the modulators operate in transmission mode and are suitable for cascading with other quasi-optical components. Relative amplitude and phase change of the transmission coefficient as a function of frequency is presented for the two digital modulators. Antenna patterns for the BPSK active antenna array modulator are also presented.
Keywords :
active antenna arrays; antenna radiation patterns; microstrip antenna arrays; microwave circuits; modulators; p-i-n diodes; phase modulation; varactors; BPSK active antenna array modulator; X-band; antenna patterns; digital modulators; p-i-n diode loaded grid; quasi-optical phase modulators; transistor antenna array; transmission type; varactor loaded grid; Amplitude modulation; Antenna arrays; Digital modulation; Frequency; Loaded antennas; P-i-n diodes; Phase modulation; Phased arrays; Transmitting antennas; Varactors;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.512162
