Communications: directive radio wave systems and devices (e.g. – Radar transponder system – Radar transponder only
Patent
1986-12-02
1988-04-12
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
Radar transponder only
342 50, G01S 1374
Patent
active
047377895
ABSTRACT:
An arrangement is disclosed for coupling electrical energy into and/or out of a surface acoustic wave (SAW) device, such as a transponder. The SAW device has two input/output terminals electrically connected to at least one transducer for converting between electrical energy and SAW energy. Such transducer presents to the terminals a prescribed capacitance in the frequency range of operation. An inductive loop, formed by at least one turn of an electrical conductor, is connected to the two input/output terminals of the SAW device. The inductance of the loop is made substantially equal to the prescribed capacitance at the frequency range of operation, thus forming a resonant circuit with the SAW device. The loop also forms a protective DC short circuit across the two terminals, preventing build-up of static electricity. The inductive loop is inductively coupled to an antenna capable of receiving and/or transmitting radiation in the frequency range of operation.
REFERENCES:
patent: 3706904 (1972-12-01), Cole et al.
patent: 3981011 (1976-09-01), Bell
patent: 4059831 (1977-11-01), Epstein
patent: 4069472 (1978-01-01), Kamata et al.
patent: 4096477 (1978-06-01), Epstein et al.
patent: 4242671 (1980-12-01), Plows
patent: 4458235 (1984-07-01), Ohyama
Milde Jr. Karl F.
Tubbesing T. H.
X Cyte, Inc.
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