Radio frequency circuit

An RF circuit comprising:

• an RF power divider circuit having an input port and a plurality of output ports, said RF power divider circuit providing, in response to a signal fed to said input port, an output signal at each output port, each output signal having known amplitude and known phase;
• means for selectively coupling at least a portion of a signal fed to an input port of said RF circuit to the input port of said RF power divider circuit;
• wherein said means for selectively coupling comprises:
• a single pole dole throw switch having a common port coupled to an input of the RF circuit, a first branch port coupled to the input port of the power divider circuit and a second branch port coupled to an output port of the RF circuit;
• and
• a plurality of directional coupler circuits, each of said coupler circuits having an input port and a coupled port with each input port coupled to a corresponding one of the plurality of output ports of the power divider circuit and each coupled port providing an output port of the RF circuit.

An RF circuit comprising:

• a switchable power divider circuit having an input port and a plurality of output ports comprising;
• a power divider circuit having an input port and a plurality of output ports corresponding to said plurality of output ports of the switchable power divider circuit;
• a first RF propagation network having a first end coupled to an input port of the RF circuit and a second end coupled to the input port of the power divider circuit;
• a first diode having an anode coupled to said RF propagation network and a cathode;
• a first resistor having a first electrode coupled to said cathode of said first diode and a second electrode coupled to ground;
• a plurality of diodes with each diode having an anode coupled to said first RF propagation network and a cathode coupled to a first reference potential and each diode of said plurality of diodes being spaced along said first RF propagation network by one-quarter of a wavelength at a predetermined frequency of operation;
• first means for coupling the input port of said switchable power divider circuit to a transmit signal path;
• and
• second means for coupling each one of the plurality of the output ports of said switchable power divider circuit to a corresponding one of a like plurality of receiver channels.

An RF circuit comprising:

• means, having an input port and an output port, for selectively coupling a portion of a signal from the input port to the output port, said selectively coupling means comprising:
• a section of transmission line having a first end coupled to the input port and a second end;
• a resistor having a first electrode and a second electrode, the second electrode coupled to ground;
• a first diode coupled between the first electrode of the resistor and the section of transmission line;
• and
• a plurality of diodes, each diode coupled between ground and the section of transmission line, each diode of said plurality of diodes having a coupling point with each coupling point spaced along said section of transmission line by one-quarter of a wavelength of a frequency of a predetermined signal;
• and
• means, coupled to the output of said selectively coupling means, for dividing a signal fed thereto into a plurality of signals, said dividing means comprising:
• a first rat-race power divider circuit having an input port coupled to the output port of said selectively coupling means, a first output port and a second output port, the first output port to provide a first one of the plurality of signals;
• and
• a second rat-race power divider circuit having an input port coupled to the second output port of the first rat-race power divider circuit, a first output port to provide a second one of the plurality of signals and a second output port to provide a third one of the plurality of signals.