Transponder with reply frequency derived from frequency of recei

Details Transponder with reply frequency derived from frequency of recei Transponder with reply frequency derived from frequency of recei

1990-12-28

1994-10-11

Eisenzopf, Reinhard J.

Telecommunications

Carrier wave repeater or relay system

With frequency conversion

455 23, 455 76, 34087002, H04B 715

Patent

active

053555139

ABSTRACT:
A transponder includes a receiver for receiving a radio interrogation signal. The transponder also includes a phase locked loop decoder for deriving a reference signal from the received interrogation signal, and a radio transmitter for transmitting a transponder reply signal. The phase locked loop has an output which feeds the AC reference signal to the transmitter. The transmitter includes a frequency doubler which generates a transmitter radio frequency at double the frequency of the reference signal. The transmitter radio frequency is therefore controlled by the radio frequency of the interrogation signal. The phase locked loop includes a divide-by-N counter, where N is a predetermined integer parameter. The parameter N determines the derivation of the reference signal frequency from the interrogation signal frequency.

REFERENCES:
patent: 4214205 (1980-07-01), Guest
patent: 4274083 (1981-06-01), Tomoeda
patent: 4339826 (1982-07-01), Ogita et al.
patent: 4513447 (1985-04-01), Carson
patent: 4614945 (1986-09-01), Brunius et al.
patent: 4862514 (1989-08-01), Kedjierski
patent: 5115515 (1992-05-01), Yamamoto et al.

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