Transverse electromagnetic mode resonator.

摘要

A TEM mode resonator has a simple resonance frequency adjusting mechanism appropriate for size reduction while permitting easy mounting of a varactor diode for varying the resonance frequency. A slot line (7) is provided perpendicular to a strip transmission line (2) which is parallel to an outer ground conductor surface (3) of a quarter wavelength type microstrip line resonator. As the slot line length increases, the resonance frequency of the resonator reduces, which characteristic is utilised as a means for adjusting the resonance frequency. The resonance frequency can be varied by connecting a varactor diode (66) at a centre portion of the slot line and varying the voltage applied to the diode. <IMAGE>