Low‐temperature cofired ceramic planar helical filter with single‐sided transmission zeros. Issue 19 (1st September 2014)

• Record Type: Journal Article
• Authors: Wu, Yafen; Che, Wenquan; Chin, Kuo‐Sheng; Chang, Kuang‐Ching; Feng, Wenjie
• Is Part Of: Electronics letters. Volume 50:Issue 19(2014)
• Page Start: 1363
• Page End: 1365
• Publication Date: 2014-09-01
• Subjects: band‐pass filters -- resonator filters -- UHF filters -- UHF resonators -- electromagnetic coupling; low‐temperature cofired ceramic planar helical bandpass filter -- single‐sided transmission zeros -- short‐circuited λg/4 helical resonators -- winding resonators -- magnetic coupling structure -- mixed electric coupling structure -- bandwidth 0.845 GHz -- frequency 0.90 GHz -- frequency 1.07 GHz; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2014.2530
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : A planar low‐temperature cofired ceramic helical bandpass filter with a compact size is presented. The proposed filter is constructed from short‐circuited λg /4 helical resonators, while the size is reduced significantly by winding resonators vertically. Two single‐sided transmission zeros can be created by the proposed mixed electric and magnetic coupling structure. A prototype with size of 6.2 × 4 mm 2 (0.049 × 0.032 λg 2 ) has been fabricated for demonstration. The measured fractional bandwidth is 5.9% at 0.845 GHz, and two transmission zeros are observed at 0.90 and 1.07 GHz.