Radio frequency receiving circuit having a passive monopulse comparator
First Claim
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1. A passive MMIC monopulse comparator circuit comprising:
- a first lumped element hybrid circuit; and
a second lumped element hybrid circuit coupled to the first lumped element hybrid circuit, wherein the first lumped element hybrid circuit and the second lumped element hybrid circuit form a part of the passive MMIC monopulse comparator circuit.
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Abstract
A passive MMIC monopulse comparator includes a plurality of lumped element hybrids having pi and T filter structures. In one embodiment, a first hybrid receives first and second downcoverted signals and provides a first output signal to a third hybrid and second output signal to a fourth hybrid. A second hybrid receives third and fourth downconverted signals and provides respective third and fourth output signals to the third and fourth hybrids. The third hybrid provides sum and elevation channel signals and the fourth hybrid provides azimuth and G channel signals.
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Citations
13 Claims
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1. A passive MMIC monopulse comparator circuit comprising:
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a first lumped element hybrid circuit; and
a second lumped element hybrid circuit coupled to the first lumped element hybrid circuit, wherein the first lumped element hybrid circuit and the second lumped element hybrid circuit form a part of the passive MMIC monopulse comparator circuit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A passive MMIC monopulse comparator, comprising:
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a first lumped element hybrid circuit receiving first and second input signals and providing first and second output signals;
a second lumped element hybrid circuit receiving third and fourth input signals and providing third and fourth output signals;
a third lumped element hybrid circuit receiving the first output signal from the first lumped element hybrid circuit and the third output signal from the second lumped element hybrid circuit and providing a sum channel output signal and an elevation channel output signal; and
a fourth lumped element hybrid circuit receiving the second output signal from the first lumped element hybrid circuit and the fourth output signal from the second lumped element hybrid circuit and providing an azimuth channel output signal and a Q channel output signal. - View Dependent Claims (8, 9, 10, 11)
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12. A radar system, comprising:
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an antenna having a plurality of antenna ports, the antenna responsive to signals having a frequency in a predetermined frequency range;
a plurality of protection circuits each of the protection circuits having a first port coupled directly to a respective one of the plurality of antenna ports and a second port, each protection circuit responsive to a first control signal which allows signals to propagate in a first direction between the first port of the protection circuit and the second port of the protection circuit and each protection circuit also responsive to a second control signal which allows signals to propagate in a second opposite direction between the first port of the protection circuit and the second port of the protection circuit;
a receiver circuit for downconverting signals from the second ports of the protection circuits to IF signals, the receiving circuit including a passive MMIC monopulse comparator. - View Dependent Claims (13)
a plurality of mixers, each of the plurality of mixers having a first port coupled to a respective one of the plurality of protection circuits, a second port for receiving a bias signal, and a third port for providing a frequency shifted signal; and
a plurality of amplifiers, each of the plurality of amplifiers having a first port coupled to the third port of a respective one of the plurality of mixers and a second port coupled to the monopulse comparator.
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Specification