Small-Sized Wide-Band Balanced Filter Consisting of Interdigitated Laminated Resonators

Tatsuya FUKUNAGA  Kouji WADA  

Publication
C - Abstracts of IEICE TRANSACTIONS on Electronics (Japanese Edition)   Vol.J91-C   No.5   pp.297-303
Publication Date: 2008/05/01
Online ISSN: 1881-0217
DOI: 
Print ISSN: 1345-2827
Type of Manuscript: PAPER
Category: 
Keyword: 
interdigital coupling,  laminated resonator,  balanced filter,  

Full Text(in Japanese): PDF(927.7KB)
>>Buy this Article


Summary: 
This paper presents a new laminated bandpass filters (BPFs) using resonators based on interdigitated resonators. In the proposed configuration, function of a balun is integrated into the filter itself. The transmission characteristics, phase balance and amplitude balance characteristics of the filters are examined by electromagnetic (EM) simulation and experiment. About unbalance to balance type balanced filter, it is measured and confirmed that amplitude balance characteristic is within 0.5 dB and phase balance charancteristic is within 180 3 in pass-band. About balance to balance type balanced filter, it is measured and confirmed that attenuation of common mode signal in pass-band is about 30 dB.