Small‐sized quasi‐elliptic parallel coupled band pass filter using microstrip discontinuity corrections and multilayer‐technique

Abstract

In this article, we present a new technique to obtain a sharp symmetric response with lower losses for microstrip coupled‐line bandpass filters using the discontinuities correction method.The technique is verified by measurements and simulations. Simulated and measured results of the proposed filters are presented and show good agreements. Additionally, based on this work it will be shown that a new idea with the help of U‐resonators and multilayer‐technique may be used in the future to reduce more the size and to suppress the second harmonic in reject band of the structure. We think that the filter structure can be applied to improve the stopband and passband performances of other microwave circuits as well as other types of filters. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2433–2438, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26262

Design and optimization of a new compact 2.4 GHz-bandpass filter using DGS technique and U-shaped resonators for WLAN applications

“…Microstrip technology remains an attractive solution to design microwave filter circuits because it is the most used industrially to realize compact and efficient microwave integrated circuits because of the existence of accurate simulation models that allow good circuit design. Coupled line techniques [3][4][5][6][7][8][9][10][11] have often been used since 1958 to design narrow-band filtering circuits because of their ease of initial design and technological realization for integrated circuits, but their disadvantage lies in their large size, which limits their integration in the new generations of intelligent electronic systems.…”