Branching filter

Abstract

Abstract PURPOSE:To attain miniaturization, light weight, ease of mounting and low cost by providing an input/output branching circuit, a dielectric filter and a low-pass filter one end and same board. CONSTITUTION:Plural input/output terminal patterns 21 and an earth pattern 22 are formed to upper and lower faces of a board 20, and the patterns 21 are connected together by through holes. Two band-pass dielectric filters 23-1, 23-2 having different center frequencies are mounted directly on the upper face of the board 20. A couple of branching filters 30-1, 30-2 and a low-pass filter 31 for eliminating spurious radiation connected to them are formed on the lower face of the board 20 by the thick film print or the like. Each branching filter is connected respectively to the filter on the upper face. Thus, miniaturization, light weight, low cost and ease of mounting are attained.

Inventors

• 👤 Izumi Kawakami
• 👤 川上　泉
• 👤 Tomokazu Komazaki
• 👤 友和 駒崎
• 👤 Katsuhiko Gunji
• 👤 勝彦 郡司
• 👤 Norio Onishi
• 👤 大西　法生

Bibliographic Details