Balanced Substrate Integrated Waveguide Filter

• Published in: IEEE transactions on microwave theory and techniques Vol. 62; no. 4; pp. 824 - 831
• Main Authors: Chu, Peng, Hong, Wei, Wang, Kuangda, Tang, Hongjun, Hao, Zhangcheng, Chen, Jixin, Wu, Ke
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-04-2014; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Balanced circuit; Band-pass filters; bandpass filter; Circuit properties; common-mode (CM) suppression; Couplings; Educational institutions; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Fabrication; Filtering theory; Frequency filters; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; substrate integrated waveguide (SIW); Substrates; Topology; Waveguide filters; Balanced circuit; High performance; bandpass filter; Prototype; common-mode (CM) suppression; Substrate integration; substrate integrated waveguide (SIW); Band pass filter; Waveguide
• ISSN: 0018-9480; 1557-9670
• DOI: 10.1109/TMTT.2014.2307055

A novel balanced filter realized in the form of substrate integrated waveguide (SIW) is proposed and studied in this paper. Based on the inherently horizontal and vertical symmetry of the SIW, this filter presents inherently high-performance balanced property with advantages of no identical pair requirement, being free from the limitation of symmetrical topology, easy and flexible design, high common-mode (CM) suppression, and robust CM suppression when comparing with conventional counterparts. Several prototypes are designed, fabricated, and measured to verify the expected properties.