@conference{10902/3293, year = {2007}, month = {9}, url = {http://hdl.handle.net/10902/3293}, abstract = {In this paper a frequency agile phase-conjugating active antenna to be employed in full-duplex and secure retrodirective communication links is presented. Thanks to the proper combination of two Enhancement-mode PHEMT devices, a simultaneous subharmonic and 180-degree singly balanced resistive mixer was designed. Full-duplex communication is achieved downconverting an AM interrogating signal and retransmitting 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.}, publisher = {URSI 2007, XXII Simposium Nacional de la Unión Científica Internacional de Radio, La Laguna}, title = {Conjugador de fase sobre una antena sintonizable en frecuencia para agrupaciones retrodirectivas full-duplex}, author = {García García, José Ángel and Cabria de Juan, Lorena and Montoro López, Gabriel and Marante Rizo, Francisco Reinerio}, }