Externally coupled structure

Abstract

Abstract PURPOSE:To sppress the TE11 spurious mode by providing a hole to the outside of a dielectric block along a through-hole of a resonator unit coupled to the block so as to form a conductive film to the inside face of the hole. CONSTITUTION:Dielectric films 13, 14 are formed at the inside face of through- holes of the dielectric block 10, conductor films 15, 16 are provided to the side face of the dielectric block surrounding the through-holes 11, 12 and the conductor films 13, 14 and the dielectric block existing between them constitute the resonator unit. The through-holes 51, 61 are provided along the through-holes 11, 12 aside the outer side face of the conductor films 52, 62 of the dielectric block from the resonator unit and the conductor films 52, 62 are formed at the inside face, one end is connected to the conductive film 16 so as to be connected to an external circuit by pins 53, 56. The degree of inductive coupling is adjusted by using a cavity 27 and slits 54, 64. An earth current flows symmetrically to a filter and since the direction of a magnetic field is opposite to each other at both sides of the inner axis of the resonator unit to be coupled, no TE11 mode is generated.

Inventors

• 👤 Toshio Nishikawa
• 👤 敏夫 西川
• 👤 Tadahiro Yorita
• 👤 寄田　忠弘

Bibliographic Details