Patent ID: 6803838
Filing Date: 2004-10-12
Classification: H01P

Abstract:
A high frequency wideband 180Â° phase switch circuit for insertion into a external circuit having an input signal port, an output signal port, and a characteristic impedance Z0, the circuit comprising:a first input port; a second input port; a first output port; a second output port; a first waveguide coupled between the first input port and the second input port; a second waveguide coupled between the first output port and the second output port; a third waveguide coupled between the first input port and the first output port; a fourth waveguide coupled between the second input port and the second output port; and a fifth waveguide coupled between central points of the third waveguide and the fourth waveguide; where: at a center frequency of a pre-determined frequency band, each of the waveguides is a half wavelength waveguide with respect to the center frequency; the first, second, third, and fourth waveguides have a first impedance approximately given by {square root over (2)}Z0; and the fifth waveguide has a second impedance approximately given by Z02.