Communications: directive radio wave systems and devices (e.g. – With particular circuit
Reexamination Certificate
2006-08-25
2008-10-14
Gregory, Bernarr E (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
C342S082000, C342S089000, C342S198000
Reexamination Certificate
active
07436353
ABSTRACT:
A transmitting-receiving module of a radar system which is an embodiment of the present invention, includes, a transmitting circuit for sending transmitting RF signal, a three terminal circulator having three terminals and with the first terminal of which is connected a transmitting-receiving antenna, a first RF switch which is connected with the second terminal of the three terminal circulator and the output can be switched over, a second RF switch with input which can be switched over, an attenuator connected between the first RF switch and the second switch, and a receiving circuit connected with the output terminal of the second RF switch, when radar signal is being transmitted, the first RF switch is connected with the attenuator, and the second RF switch is not connected with the attenuator, when radar signal is being received, the first RF switch is connected with the second RF switch directly or connected through a low noise amplifier.
REFERENCES:
patent: 2935743 (1960-05-01), Glegg
patent: 3761924 (1973-09-01), McGowan
patent: 4725842 (1988-02-01), Mayberry
patent: 4792805 (1988-12-01), Miglia
patent: 5270719 (1993-12-01), Roth
patent: 5446464 (1995-08-01), Feldle
patent: 2004-153653 (2004-05-01), None
“Receiver Protector Technology”; no author listed; no date given; CPI Wireless Solutions, Beverly Microwave Division; Beverly, Massachusetts, U.S.A.
M.I. Skolnik, “Introduction to Radar Systems”; McGraw-Hill Book Company; New York; Second Edition, 1980; p. 365, section with the heading “Circulator and receiver protector.”
Gregory Bernarr E
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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