Radio frequency receiving circuit
First Claim
1. A receiving system comprising:
- an antenna having a plurality of antenna ports, said antenna responsive to signals having a frequency in a predetermined frequency range; and
a plurality of protection circuits each of said 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 said protection circuit and the second port of said 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 said protection circuit and the second port of said protection circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A compact RF monopulse receiver circuit having a relatively low noise figure which is particularly useful for operation in the millimeter wave frequency range is described. The compact monopulse receiver finds use in small projectile and small missile applications. Also, a combination of transmit signal protection circuitry and receiver circuit architecture allows the RF monopulse receiver circuit to operate in a missile or other projectile which utilizes high RF power transmit signals. The RF monopulse receiver circuit can directly provide a radiation pattern for target detection and tracking or alternatively, the RF monopulse receiver circuit can function as a monopulse feed circuit which can be used, for example, in a quasi-optically fed reflector antenna.
53 Citations
39 Claims
-
1. A receiving system comprising:
-
an antenna having a plurality of antenna ports, said antenna responsive to signals having a frequency in a predetermined frequency range; and a plurality of protection circuits each of said 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 said protection circuit and the second port of said 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 said protection circuit and the second port of said protection circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
-
23. An RF receiver comprising:
-
a plurality of mixers, each of said mixers having an RF signal port, an LO signal port and an IF signal port and each of said mixers comprising one or more mixer diodes; means for coupling RF energy to the RF signal port of each of said plurality of mixers; a plurality of intermediate frequency amplifiers, each of said plurality of intermediate frequency amplifiers having an amplifier input port coupled to the IF signal port of a respective one of said plurality of mixers and each of said intermediate frequency amplifiers having an amplifier output port; a monopulse comparator network having a plurality of monopulse circuit input ports and a plurality of monopulse circuit output ports, each of said plurality of monopulse circuit input ports coupled to the output port of a respective one of said plurality of intermediate frequency amplifiers; a self-contained cryogenic cooling system for cooling said mixer diodes to a predetermined temperature within a predetermined range of temperatures; an amplitude and phase adjustment circuit coupled between the output ports of said plurality of intermediate frequency amplifiers and the input ports of said monopulse comparator network. - View Dependent Claims (24, 25, 26, 27)
-
-
28. An RF monopulse receiver comprising:
a circuit assembly having a plurality of RF input ports and a plurality of IF output ports, said circuit assembly comprising; (a) a housing; (b) a plurality of subharmonically pumped mixer circuits disposed in said housing, each of said mixer circuits having an RF signal port, an LO signal port and an IF signal port and each of said mixer circuits comprising; (1) a plurality of mixer diode substrates disposed in said housing, each of said substrates having a diode mounting region which projects into a mixer diode feed region, said mixer diode feed region formed by providing an RF opening in a cover disposed over the diode mounting region of said plurality of substrates; (2) an antiparallel diode pair disposed on the diode mounting region of each of said plurality of substrates; (3) a feed circuit; (4) an LO distribution circuit; (5) an IF distribution circuit; (c) an RF feed circuit, coupled to said housing, (d) means, for coupling RF energy to the RF signal port of each of said plurality of subharmonically pumped mixer circuits; (e) a monopulse substrate; and (f) an integrated circuit monopulse comparator network disposed on said monopulse substrate, said monolithic microwave integrated circuit monopulse comparator network having a plurality of monopulse circuit input ports, each of said plurality monopulse circuit input ports coupled to the IF port of a respective one of said plurality of subharmonically pumped mixer circuits and having a plurality of monopulse circuit output ports. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
Specification