Compact microstrip bandpass filter with fragment‐loaded resonators

Abstract

Microstrip bandpass filter with fragment‐loaded resonators is proposed and designed using multiobjective evolutionary algorithm based on decomposition combined with enhanced genetic operators (MOEA/D‐GO). When loaded by fragment‐type structures, microstrip resonators may have compact size and operate at different modes. By properly setting the modes of fragment‐loaded resonators in objectives of MOEA/D‐GO, stopband attenuation and spurious passband suppression of the microstrip bandpass filter can be readily adjusted and controlled. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2896–2899, 2014

Moea/D-Go+fdtd for Optimization Design of Fragment-Type Structure

“…According to the distribution of "1" and "0", a fragment-type structure is represented by a 0/1 design matrix. Fragment-type structure has found some successful applications in both antenna and microwave circuit designs [1][2][3][4][5][6]. In [1], fragment-type isolation structures between MIMO (multiple-input and multi-output) PIFAs (planar inverse-F antennas) are designed.…”

“…In [5], broadband directional couplers with high-directivity are designed by using fragment-type structure. In [6], compact fragment-type microstrip filters with low insertion loss are designed.…”

“…In terms of electromagnetic simulator, HFSS (High Frequency Structure Simulator) [1,5,6], CST (Computer Simulation Technology) Microwave Studio [10], FDTD (Finite-Difference Time-Domain) method based simulation tools [4,11,12] are commonly used. The selection of electromagnetic simulator should make balance of computational cost and simulation accuracy.…”

Compact and highly-selective microstrip bandpass filter and diplexer using two-stage twist modified split-ring resonators

“…Owing to the low-profile, easy-to-fabrication and flexible integration with radio frequency/microwave integrated circuits, microstrip structure is one of the most important implementations and microstrip filter is the basic element which can further construct diplexer and triplexer. In the past several years, various compact microstrip bandpass filters have been proposed and discussed, by using half-wavelength and quarter-wavelength resonators [1]- [3], SIR-hairpin res onator [4], multimode stub-loaded resonator [5], and fragment loaded open-loop resonator [6]. Most of them showed quite compact dimensional size and well filtering performances, such as multi transmission poles within the passband and transmission zeros right below and above the passband [1], [2], and wide out-of-band rejection [2], [4], [6].…”

“…In the past several years, various compact microstrip bandpass filters have been proposed and discussed, by using half-wavelength and quarter-wavelength resonators [1]- [3], SIR-hairpin res onator [4], multimode stub-loaded resonator [5], and fragment loaded open-loop resonator [6]. Most of them showed quite compact dimensional size and well filtering performances, such as multi transmission poles within the passband and transmission zeros right below and above the passband [1], [2], and wide out-of-band rejection [2], [4], [6]. Moreover, various microstrip diplexers/triplexes with compact size, well isolation and out-of-band rejection properties are developed [7]- [10] based on the different resonators as well.…”