Isolation apparatus for a continuous-wave radar system
First Claim
1. In a radar system having a transmitter which operates continuously to produce a transmission signal, a receiver which operates simultaneously with said transmitter to receive target signals reflected from irradiated targets, an antenna, and a circular for simultaneously coupling said transmitter and said receiver to said antenna while isolating said receiver from said transmission signal, the improvement comprising:
- waveguide means connected between said circulator and said antenna for conducting said transmission signal to said antenna from said circulator and for conducting said target signals from said antenna to said circulator; and
reactive means extending into said waveguide means for reflecting to said circulator a reflected portion of, said transmission signal which, over a predetermined leakage signal frequency range, has a magnitude that is substantially equal to the magnitude of a leakage portion of said transmission signal transmitted by said circulator to said receiver and which, over said predetermined leakage signal frequency range, has phase change characteristics substantially opposite to the phase change characteristics of said leakage portion.
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Accused Products
Abstract
Apparatus for isolating a radar receiver from a radar transmitter in a continuous wave, single antenna radar system where a circulator connects transmitter, receiver, and antenna. The apparatus includes a reactive element which reflects back through the circulator a portion of a transmission signal provided from the transmitter through the circulator to the antenna. The reflected transmission signal portion is equal in magnitude and opposite in phase to a leakage portion of the transmission signal transmitted by the circulator from the transmitter to the receiver. The reflected and leakage signal portions cancel in the circulator to enhance the isolation of the receiver.
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Citations
11 Claims
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1. In a radar system having a transmitter which operates continuously to produce a transmission signal, a receiver which operates simultaneously with said transmitter to receive target signals reflected from irradiated targets, an antenna, and a circular for simultaneously coupling said transmitter and said receiver to said antenna while isolating said receiver from said transmission signal, the improvement comprising:
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waveguide means connected between said circulator and said antenna for conducting said transmission signal to said antenna from said circulator and for conducting said target signals from said antenna to said circulator; and reactive means extending into said waveguide means for reflecting to said circulator a reflected portion of, said transmission signal which, over a predetermined leakage signal frequency range, has a magnitude that is substantially equal to the magnitude of a leakage portion of said transmission signal transmitted by said circulator to said receiver and which, over said predetermined leakage signal frequency range, has phase change characteristics substantially opposite to the phase change characteristics of said leakage portion. - View Dependent Claims (2, 3, 4)
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5. An apparatus for isolating a radar receiver which operates simultaneously with an associated radar transmitter in a continuous-wave, single antenna radar system, comprising:
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a circulator for connecting to a single radar antenna a continuously-operating radar transmitter and a radar receiver which operates simultaneously with said transmitter; waveguide means for providing radar signal conductivity between said circulator and a radar antenna; and reactive means extending into said waveguide means for reflecting to said circulator a reflected portion of a transmission signal being conducted by said waveguide means from said circulator for transmission by a radar antenna, said reflected portion having, over a predetermined leakage signal frequency range, a magnitude that is substantially equal to the magnitude of a leakage portion of said transmission signal that is conducted by said circulator from a transmission signal source to a radar receiver connected to said circulator and having, over said predetermined leakage signal frequency range, a phase change characteristic that is substantially opposite to the phase change characteristic of said leakage signal. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification