Band-Widening of Ceramic Resonator Loaded NRD Guide Band-Pass Filter at 60 GHz

Futoshi KUROKI
Hiroya SATO

IEICE TRANSACTIONS on Electronics   Vol.E84-C    No.10    pp.1569-1574
Publication Date: 2001/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Millimeter-Wave Circuits and Fabrication Technologies Opening up the 21st Century)
millimeter wave filter,  NRD guide,  ceramic resonators,  millimeter-wave integrated circuits,  

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Although TE0nδ mode ceramic resonators are usually used at centimeter frequencies, they have difficulty in making wide-band band-pass filters in the millimeter-wave region due to the weak coupling factors between TE0nδ mode resonators and input/output waveguides. In order to overcome such difficulty, a band-widening technique of the ceramic resonator loaded band-pass filter has been proposed. The EHnmδ modes were regarded as spurious modes so far, but it is clear that the coupling factors are larger than those of the TE0nδ modes from the results of experimental considerations in this paper. By using the EH11δ mode ceramic resonators, 5-pole, 1 dB Chebyshev ripple NRD guide band-pass filter has been fabricated for the applications to broad-band millimeter-wave communication systems at 60 GHz. The filter has great advantages such as the wide pass-band beyond 2 GHz and low excess insertion loss of less than 0.3 dB.