| US 7,528,767 B2 | ||
| Variable ratio power divider for a dual polarization radar system with automatic built-in test equipment and calibration | ||
| William H. Walker, Madison, Ala. (US) | ||
| Assigned to Baron Services, Inc., Huntsville, Ala. (US) | ||
| Filed on Dec. 07, 2007, as Appl. No. 11/952,692. | ||
| Application 11/952692 is a continuation in part of application No. 11/941905, filed on Nov. 16, 2007. | ||
| Claims priority of provisional application 60/906730, filed on Mar. 13, 2007. | ||
| Prior Publication US 2008/0224921 A1, Sep. 18, 2008 | ||
| Int. Cl. G01S 7/40 (2006.01) | ||
| U.S. Cl. 342—174 [342/188] | 8 Claims |
| 1. A variable ratio power divider used for adjusting a calibration signal for a dual polarization radar system, comprising:
an input line that receives a calibration signal and splits the calibration signal into a first test signal and a second test
signal, where the test signals have a 0° phase shift;
a horizontal polarization output port for a horizontal calibration signal;
a vertical polarization output port for a vertical calibration signal;
a waveguide switch that receives the first test signal;
where the waveguide switch may be configured to operate in an open position and pass the first test signal through a variable
0°-180° phase shifter so that the power of the first and second test signals is evenly divided between the horizontal polarization
output port and the vertical polarization output port; and
where the waveguide switch may be configured to operate in a closed position and cause the first test signal to bypass the
variable 0°-180° phase shifter so that the entire power of the first and second test signals is directed entirely to either
the horizontal polarization output port or the vertical polarization output port.
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