A Multilayer Single-Input/Single-Output Dual-Band Filter Fabricated in a High Permittivity LTCC Substrate

Shoichi KITAZAWA  Hideyuki MIYAKE  Masahiro GESHIRO  Masaharu OHASHI  

IEICE TRANSACTIONS on Electronics   Vol.E89-C    No.4    pp.509-516
Publication Date: 2006/04/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.4.509
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Advanced RF Technologies for Compact Wireless Equipment and Mobile Phones)
dual band,  band pass filter,  matching,  LTCC,  

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This paper presents a design procedure of multilayer single-input/single-output dual-band filters of small size fabricated in high-permittivity LTCC (Low Temperature Co-fired Ceramic) substrates. The present dual-band filter, with pass bands of 950 MHz and 1.9 GHz, consists of two single-band filters each one of which has a matching circuit for controlling the input impedance in the pass band of the counterpart. Discussed first in this paper is a dual-band filter that has the matching circuit connected to the single-band filters externally. Then, a dual-band filter with the matching circuit embedded in its body is investigated together with metallization patterns of the matching elements. Presented finally is a very small single-input/single-output dual-band filter suitable for dual-band wireless communication systems.