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Small-Sized Wide-Band Balanced Filter Consisting of Interdigitated Laminated Resonators
Tatsuya FUKUNAGA Kouji WADA
C - Abstracts of IEICE TRANSACTIONS on Electronics (Japanese Edition)
Publication Date: 2008/05/01
Online ISSN: 1881-0217
Print ISSN: 1345-2827
Type of Manuscript: PAPER
interdigital coupling, laminated resonator, balanced filter,
Full Text(in Japanese): PDF(927.7KB)
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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.