The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 1979
Filed:
Apr. 18, 1977
Michael E Shepperd, Indianapolis, IN (US);
General Aviation Electronics, Inc., Indianapolis, IN (US);
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.