Miniature bandpass filter with wide stopband using open‐loop resonators

Abstract

To reduce the size and improve the performance, a miniature microstrip bandpass filter (BPF) is investigated in this article. On the basis of open‐loops, an interdigital capacitive load has been connected. The new design has advantages of a compact size and a large ratio of the first spurious resonant frequency to the fundamental frequency. A fabricated microstrip BPF has been validated design, and experiment results are shown in very good agreement with expectation. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:748–751, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25829

Method of moments wide‐band simulations of the microstrip circuits with second‐order Arnoldi reduced model

“…The convergence error ɛ is fixed as 0.01. We first simulate a bandpass filter in [7] as shown in Fig. 1 a , the dimension parameters are listed in Fig.…”

“…Fig. 2 plots the S 21 curves measured in [7], simulated with the original model (full MoM) and reduced model (obtained with SOAR). Good agreement between them can be found.…”

“…Layout and dimensions of bandpass filter [7], unit is millimetres a Layout of the bandpass filter b Dimensions lists of the bandpass filter…”

“…Layout and dimensions of bandpass filter[7], unit is millimetres a Layout of the bandpass filter b Dimensions lists of the bandpass filter Validation: simulated S21 of bandpass filter in[7] with original and reduced models Layout of microstrip packaged interconnects…”