Patent ID: 7035602

Claim:
A hybrid radio frequency (RF) switching device for switching RF signals in a first frequency band and a second frequency band being higher than the first frequency band, the hybrid RF switching device comprising: first to fourth ports for at least one of inputting and outputting the RF signals; a diode coupled between the first and second ports; a first transmission line having an electrical line length of λg/4×n, λg being a wavelength of a frequency in the first frequency band, n being an odd number of 1 or larger; a first element coupled between the second and third ports in series with the first transmission line, the first element having an impedance that is substantially reactive in the second frequency band; a second element coupled at a coupling position where the first element having a nearly open impedance in the second frequency band, the second element having an impedance that is substantially reactive in the first frequency band; a second transmission line coupled at the coupling position in series with the second element, the second transmission line having an open impedance as seen from the coupling position in the first frequency band; and a reactance circuit coupled between the coupling position and a ground.