Substrate Integrated Waveguide Filter With Improved Stopband Performance for Satellite Ground Terminal

• Published in: IEEE transactions on microwave theory and techniques Vol. 57; no. 3; pp. 674 - 683
• Main Authors: Xiao-Ping Chen, Ke Wu, Drolet, D.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.03.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Applied sciences; Band pass filters; Bandwidth; Circuit boards; Circuit properties; Design engineering; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Filtering theory; Filters; Frequency filters; Grounds; Metallization; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Noise levels; Nonlinear filters; nonphysical coupling; Passband; Performance enhancement; Printed circuit boards; Radiocommunications; Satellite telecommunications. Space telecommunications; Satellites; substrate integrated waveguide (SIW); Telecommunications; Telecommunications and information theory; Temperature measurement; Terminals; Tolerance analysis; Topology; transmission zeros; Waveguide filters; Performance evaluation; Wireless telecommunication; Non linear filter; Satellite telecommunication; Microwave; tolerance analysis; Filters; Frequency band; Cavity; substrate integrated waveguide (SIW); Traffic control; Band pass filter; Linear antenna arrays; Waveguide filters; Patents; Multivariable control; Linear array; Substrate integration; Teletraffic; nonphysical coupling; Printed circuit board; Waveguide; Queueing system; Ka band; Traffic management; Insertion loss; Printed circuit; Passband; transmission zeros; Via hole
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2009.2013316

In this paper, patent pending substrate integrated waveguide (SIW) bandpass filters with moderate fractional bandwidth and improved stopband performance are proposed and demonstrated for a Ka-band satellite ground terminal. Nonphysical cross-coupling provided by higher order modes in the oversized SIW cavities is used to generate the finite transmission zeros far away from the passband for improved stopband performance. Different input/output topologies of the filter are discussed for wide stopband applications. Design considerations including the design approach, filter configuration, and tolerance analysis are addressed. Two fourth-order filters with a passband of 19.2-21.2 GHz are fabricated on a single-layer Rogers RT/Duroid 6002 substrate using linear arrays of metallized via-holes by a standard printed circuit board process. Measured results of the two filters agree very well with simulated results, showing the in-band insertion loss is 0.9 dB or better, and the stopband attenuation in the frequency band of 29.5-30 GHz is better than 50 dB. Measurements over a temperature range of -20degC to +40degC show the passband remains almost unchanged.