Title :
A circularly polarized FET oscillator active radiating element
Author :
Birkeland, J. ; Itoh, T.
Author_Institution :
Dept. of Electr. Eng., Texas Univ., Austin, TX, USA
Abstract :
An FET oscillator that combines the power from three devices and directly generates circularly polarized radiation using a novel feedback arrangement is presented. Because of its transmission type configuration, it exhibits a broad injection locking range. This makes it useful as an element of an active antenna, where several such oscillators would be locked to a modulated signal. The injection locking signal would be orders of magnitude lower than the corresponding drive level for a passive antenna. The radiated field exhibits a minimum axial ratio of 1.04.<>
Keywords :
active antennas; antenna phased arrays; field effect transistor circuits; microwave antennas; microwave oscillators; polarisation; solid-state microwave circuits; FET oscillator active radiating element; active antenna; axial ratio; broad injection locking range; feedback arrangement; generates circularly polarized radiation; injection locking signal; modulated signal; power from three devices; radiated field; transmission type configuration; Coupling circuits; FETs; Frequency; Injection-locked oscillators; Microstrip antennas; Patch antennas; Polarization; Polyethylene; Scattering parameters; Transmission line matrix methods;
Conference_Titel :
Microwave Symposium Digest, 1991., IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-87942-591-1
DOI :
10.1109/MWSYM.1991.147252
