DEVELOP COMPACT DUAL-BAND BANDPASS FILTERS ON THE ALUMINUM OXIDE

作者：Yang Hung Chi; Yang Cheng Fu; Cheng Chien Ming^*

来源：Microwave and Optical Technology Letters, 2010, 52(5): 1091-1094.

DOI：10.1002/mop.25126

• modified coupled line
• dual-band
• bandpass filter
• modified SIR

For the purpose of minimizing the dual-band bandpass filters (2.4 and 5.7 GHz), two stepped impedance resonator structures are modified and involved in a pair of distorted coupled lines to form a compact structure. And because the designed filter is printed on the high quality factor mid dielectric constant aluminum oxide ceramic substrate by the screen-printing technique, the characteristics of the filters could be imply,wed and the size of the filters could be minimized to only 22.2 x 12 mm(2). Furthermore, the modified SIR structure can be used to tune the second resonant frequency (harmonic) for the applications of dual bands, and the modified coupled line structures can be used to excite additional transmission zeros and adjust its locations, which can improve the characteristics of the filters effectively. In this article, the optimum measured insertion loss and bandwidth for 2.4 GHz are -0.98 dB and 11.1%, respectively, and for 5.7 GHz are -1.05 dB and 10.1%, respectively.

• 出版日期2010-5