Title :
A full-duplex dual-frequency self-steering array using phase detection and phase shifting
Author :
Shiroma, Grant S. ; Miyamoto, Ryan Y. ; Shiroma, Wayne A.
Author_Institution :
Dept. of Electr. Eng., Univ. of Hawaii, Honolulu, HI
Abstract :
A full-duplex dual-frequency self-steering array using phase detection and phase shifting is presented. By RF decoupling the transmitter and receiver arrays, the proposed system promises greater system efficiency by ensuring a constant transmit power. This also allows for a separate low-frequency interrogating signal capable of various modulation schemes. A two-element prototype is demonstrated with interrogating and retrodirective frequencies of 1.425 and 2.85 GHz, respectively. Retrodirectivity is reported for angles of 0deg, -15deg, and +25deg. The power of the received signal is improved by up to 12 dB for -60deglesthetasles60deg when compared to a conventional two-element array
Keywords :
UHF antennas; antenna arrays; beam steering; multifrequency antennas; phase detectors; phase shifters; 1.425 GHz; 2.85 GHz; RF decoupling; dual-frequency self-steering array; full-duplex self-steering array; interrogating signal; low-frequency signal; microwave antenna arrays; phase detection; phase shifting; phased arrays; retrodirective array; Circuits; Data communication; Geometry; Microwave antenna arrays; Phase detection; Phased arrays; Radio frequency; Radiofrequency identification; Sensor arrays; Transmitters; Antenna arrays; microwave antenna arrays; phased arrays; retrodirective array;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.860330
