Multiband transformation stage for a multiband r.f. switching device

摘要

A multiband transformation stage (14) comprising a common first signal port (20), a common second signal port (26) and a signal path (50) coupled between the first signal port (20) and the second signal port (26) is described. The signal path (50) is switchable between a first state with a first quarter-wavelength transformer characteristic for a first frequency band, a second state with a second quarter-wavelength transformer characteristic for a second frequency band and a third state with a transmission characteristic. The invention also relates to a multiband switching device comprising the multiband transformation stage (14) and at least one of a high-power stage (12) and a low-power stage (16).