Dielectric filter

Abstract

Abstract PURPOSE:To miniaturize a dielectric filter by forming a convex dielectric block and therefore shortening the length of a pierced hole for resonance regardless of the using wavelength. CONSTITUTION:A dielectric block 21 is made of a material of a high dielectric constant and has level differences at both side surfaces. In this case, the width W1 of the upper surface is smaller than the width W of the bottom surface. A non-metallized surface 24 is provided to the upper surface of the block 21, and a metallized external conductive film 25 is provided to all other surfaces. Plural pierced holes 22 for resonance having metallized internal conductive film 12a formed on the inner surfaces are arrayed in the lengthwise direction of the block 21. The upper end of the film 12a ends at the surface 24 and opened, and the lower end of the block 21 is short-circuited to an external conductor 25 on the bottom surface of the block 21. A block 11 has a non-metallized pierced hole 26 through which an input/output oscillator 23 is attached. Thus the height L' can be set at <=1/4 wavelength.

Inventors

• 👤 Takeyasu Maeda
• 👤 前田　健康
• 👤 Takeshi Meguro
• 👤 目黒　驍

Bibliographic Details