High frequency circuit device

Abstract

Abstract PURPOSE:To ensure the stable working and easy control for a high frequency circuit, by providing an electric wave absorber to the inner side of a metallic upper cover and absorbing the electromagnetic field of an undesired mode that is generated within a housing. CONSTITUTION:A microstrip line 3 is formed on a dielectric substance 2 which is joined to an earth conductor 1. Thus a high frequency cicuit is formed. This circuit is joined to a housing 7 which is provided with a metallic housing 4 and a metallic upper cover 5 containing an electric wave absorber 6 of having (t) thickness adhered to its inner side to absorb the electromagnetic wave generated within the housing. In general, the undesired resonance of the metallic housing does not occur in case when a side of the square metallic housing is equal to the wavelength within a tube of a transmitting signal band (or a handling frequency band) and shorter than the half wavelength. However, the size of the housing is inevitably large with an actual high frequency circuit. As a result, the undesired resonance is produced within the metallic housing. In this connection, the absober 6 is provided to absorb the undesired electromagnetic field generated within the housing 7. Thus the undesired resonance can be easily eliminated for the housing 7.

Inventors

• 👤 Takashi Machida
• 👤 町田　高

Bibliographic Details