1977-04-18
1979-10-09
Griffin, Robert L.
325 22, 325370, H04B 140
Patent
active
041707567
ABSTRACT:
A network for connecting a receiver and a transmitter to a common antenna to utilize the antenna for both transmit and receive modes of operation is disclosed, which network is suitable for either relay antenna switching or solid state antenna switching. The network includes a band pass filter coupling the transmitter output to the antenna at least during the transmit mode of operation and first and second filter junction points for coupling the antenna to the receiver. One of the first and second junction points is coupled to the receiver at least during the receive mode of operation, and includes means for inhibiting the application of the transmitter output signal to the receiver during the transmit mode of operation. When the circuit employs an antenna switching relay, this relay, typically a single pole double-throw relay, has normally closed contacts coupling the second filter junction point to the receiver, and normally open contacts closable to complete the coupling of the transmitter output to the antenna only in the transmit mode of operation. When the network is employed for solid state antenna switching, the band pass filter continuously couples the transmitter output to the antenna and the first filter junction point includes a further filtering arrangement, the frequency characteristics of which are variable with the mode of operation to allow receipt of incoming signals in the receive mode, while inhibiting the application of transmitted signals to the receiver in the transmit mode.
REFERENCES:
patent: 2855508 (1958-10-01), Barlow
patent: 3117241 (1964-01-01), Paynter
patent: 3162809 (1964-12-01), Yax
patent: 3327215 (1967-06-01), Battin
patent: 3328694 (1967-06-01), Brady
patent: 3424983 (1969-01-01), Schilb
patent: 3437931 (1969-04-01), Schultz
patent: 3781684 (1973-12-01), Inslerman
patent: 4055807 (1977-10-01), Priniski
General Aviation Electronics, Inc.
Griffin Robert L.
Masinick Michael A.
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