A Dual‐Mode Split Microstrip Resonator and Its Applications in Frequency Selective Devices

Abstract

A dual‐mode microstrip resonator whose strip conductor is partially split from its one end by a longitudinal slot has been studied. The resonator has two fundamental modes, even and odd ones. The difference of their frequencies is controlled by varying the slot length. Based on such resonators, original structures of a diplexer and passband filters including dual‐band have been designed. Measured performances of their fabricated prototypes prove applicability of designed devices in microwave engineering. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2186–2190, 2013

Design of Compact Quad-Channel Diplexer Using Quad-Mode Stub-Loaded Resonators

“…The fabricated quad-channel diplexer has measured center frequencies at Load 1 (0.9/1.2 GHz) and Load 2 (1.5/1. 21 | of 1.3/1.6 dB, and 3-dB FBW of 7.3/4.1% at 1.5/1.8 GHz. When the widths of the passbands are specified, the maxima of |S 11 | in the first and second passbands can be tuned by changing g 3 , decrease of the parameter g 3 raises the coupling between port 2 and the resonator, and increase of the coupling above an optimal value raises the maxima of reflection in these two passbands [21].…”

“…A novel dual-mode split microstrip resonator was proposed in [18], its even-and odd-modes can be varied independently in a wide range and the two lower resonant frequencies maybe arbitrary close to each other. Based on the split microstrip resonator, a variety of compact high performance filters [19,20] and diplexer [21] were designed to prove the merits of the resonator. Recently, multi-channel diplexer attracts more and more attention, it can largely improve the density of integration for microwave systems.…”

Microstrip Diplexer With Π-Shaped Matching Circuit

“…Several main approaches are used to solve the problem. In stripline technology they are: (1) a combination of low pass filter (LPF) and high pass filter (HPF) or LPF and band pass filter [1,2]; (2) using a T-junction (or Y-junction) as a matching circuit [3][4][5]; (3) applying a dual-mode resonator whose 1st mode is tuned to the center frequency of the low-frequency (LF) channel, and the 2nd mode is tuned to the center frequency of the high-frequency (HF) channel [6][7][8][9][10][11]; and (4) the matching circuit is simply a segment of a line with one end being a common port and the other electromagnetically coupled with input resonators of the channels [12,13].…”

Dual-Band Bandpass Filters Using a Novel Quad-Mode Stub-Loaded Ring Resonator

“…In [19], a dual-mode split microstrip resonator was presented and its even-and odd-modes can be varied independently in a wide range and the two lower resonant frequencies maybe arbitrary close to each other. Using the split microstrip resonator, the author implemented a variety of compact high performance filters and other frequency selective devices [20]. In [21], a microstrip square ring resonator with open-circuited stubs loaded was proposed.…”