Browsing by Author "Jiang, M"

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A fully planar microstrip coupled-line coupler with a high coupling level
(2005-07-20)
Chen, CC
;
Kuo, JT
;
Jiang, M
;
Chin, A
;
傳播研究所
A fully planar microstrip coupler with a high coupling level tip to 4 dB is fabricated on PCB. Based on the conventional coupled-line structure, a gap Size of coupled lines about 14 mu m is realized by low cost IC process. It has a single stage and requires no bond wire. In measurement, a bandwidth more than 50% and isolation and return loss better than -20 dB are achieved. The measured responses have good agreement with EM simulation data. (c) 2005 Wiley Periodicals, Inc.
Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses
(2003-10-01)
Kuo, JT
;
Chen, SP
;
Jiang, M
;
交大名義發表
;
電信工程研究所
In a parallel-coupled microstrip filter, end stages with over-coupling are designed to suppress the unwanted responses at twice the passband frequency (2f(o)). The inherent transmission zero of an over-coupled input/output stage is shown tunable. It is found that increasing the image impedance of the filter sections can further enhance the suppression. The designed bandpass filters thus have a wide upper stopband and improved passband response symmetry. Measured results of fabricated circuits show that the idea works very well.