Title :
A Frequency Agile Phase-Conjugating Active Antenna for Full-Duplex Retrodirective Arrays
Author :
García, José A. ; Cabria, Lorena ; Mediavilla, Angel
Author_Institution :
Dept. of Commun. Eng., Cantabria Univ., Santander
Abstract :
In this paper, a frequency agile phase-conjugating active antenna is presented, for its use in full-duplex and secure retrodirective communication links. Two enhancement-mode PHEMT´s are properly combined to simultaneously act as a subharmonic and a 180-degree singly balanced resistive mixer, allowing downconversion of an AM interrogating signal as well as retransmission of a BPSK response. A varactor-controlled printed patch is tuned to the hopping frequency of the desired interrogation, reducing the possibility of communication interception and thus improving link security. Measurement results in a scatterer test-set validate the proposed cost-effective solution
Keywords :
active antennas; directive antennas; high electron mobility transistors; microstrip antenna arrays; microwave mixers; phase shift keying; telecommunication security; AM interrogating signal; BPSK response retransmission; active antenna; antenna array; communication interception; communication links; downconversion; enhancement mode PHEMT; full duplex arrays; hopping frequency; link security; resistive mixer; retrodirective arrays; scatterer test-set; tunable antennas; varactors controlled printed patch; Antenna arrays; Array signal processing; Binary phase shift keying; Communication system security; Frequency; Modulation; Phased arrays; Radiofrequency identification; Sensor arrays; Spread spectrum communication; Active antenna; E-PHEMT; antenna array; resistive mixers; retrodirective arrays; tunable antennas;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249690
