Tunable Dual-Band Filter and Diplexer Based on Folded Open Loop Ring Resonators

2017 ◽  
Vol 64 (9) ◽  
pp. 1047-1051 ◽  
Author(s):  
Weijie Feng ◽  
Ying Zhang ◽  
Wenquan Che
Keyword(s):  
Open Loop ◽  
Ring Resonators ◽  
Dual Band ◽  
Band Filter ◽  
Loop Ring

A novel tri-band filter using stub-loaded open loop ring resonators

2010 ◽  
Vol 52 (3) ◽  
pp. 523-526 ◽  
Author(s):  
Xin Lai ◽  
Bian Wu ◽  
Tao Su ◽  
Chang-Hong Liang
Keyword(s):  
Open Loop ◽  
Ring Resonators ◽  
Band Filter ◽  
Loop Ring

scholarly journals A Compact Tri-Band Bandpass Filter with High Out-of-Band Rejection

2017 ◽  
Vol 7 (4) ◽  
pp. 1786-1790
Author(s):  
M. Abdul-Niby ◽  
M. Farhat ◽  
M. Nahas ◽  
Μ. Μ. Alomari
Keyword(s):  
Degrees Of Freedom ◽  
Bandpass Filter ◽  
Wide Band ◽  
Open Loop ◽  
Dual Band ◽  
Center Frequency ◽  
Transmission Zeros ◽  
Harmonic Rejection ◽  
Band Filter ◽  
Loop Ring

This paper presents a planar tri-band bandpass filter with high out-of-band rejection over a wide band. The filter is based on two pairs of λ/4 resonators embedded inside an open loop ring resonator without any size increase, where each pair of resonators are electromagnetically coupled to each other and the feedlines. This results in the excitations of passbands, where the first passband is generated by the open loop resonators. The second and the third passbands are excited by λ/4 resonators. The proposed technique provides sufficient degrees of freedom to control the center frequency and bandwidth of the three passbands independently. In addition, the six transmission zeros created around the passbands results in a tri-band filter with high selectivity, sharp 3 dB cut-off frequency, high isolation, low passband insertion-loss and high out-of-band harmonic rejection across an ultra-broadband frequency range up to 17 GHz. The proposed technique has the ability to switch from triple to dual band by removing one pair of the inner resonators. Design methodology and simulation results of the filter are provided.

Compact Dual-Band Bandpass Waveguide Filter with H-Plane Inserts

2015 ◽  
Vol 25 (03) ◽  
pp. 1640015 ◽  
Author(s):  
Snežana Stefanovski ◽  
Milka Potrebić ◽  
Dejan Tošić ◽  
Zoran Stamenković
Keyword(s):  
Filter Design ◽  
Ring Resonators ◽  
Dual Band ◽  
Filter Model ◽  
Band Filter ◽  
Waveguide Filter ◽  
Waveguide Resonators ◽  
Electromagnetic Models ◽  
Compact Filter ◽  
Good Agreement

A novel compact dual-band bandpass waveguide filter is presented in this paper. H-plane metal inserts with complementary split-ring resonators are implemented as resonating elements in the standard (WR-90) rectangular waveguide. Design starts from the models of the waveguide resonators with two resonant frequencies (9[Formula: see text]GHz and 11[Formula: see text]GHz) using a single flat or folded metal insert. Further, folded inserts are used for the second-order dual-band filter design. The equivalent circuits are proposed for the considered waveguide resonators and filter. A good agreement of the amplitude responses obtained for three-dimensional electromagnetic models and microwave circuits is achieved. Finally, compact dual-band bandpass waveguide filter is proposed as a novel solution using miniaturized inverters for both central frequencies. Compact filter model is further modified in order to obtain solution customized for easier fabrication. For the compact filter model, amplitude response is experimentally verified. The required filter response is preserved, as verified by a good agreement of the results obtained for the original dual-band filter and for the compact filter solutions.

scholarly journals Design and Fabrication of a Novel Quadruple-Band Monopole Antenna Using a U-DGS and Open-Loop-Ring Resonators

2017 ◽  
Vol 6 (3) ◽  
pp. 59 ◽  
Author(s):  
A. Boutejdar ◽  
M. Challal ◽  
S. D. Bennani ◽  
F. Mouhouche ◽  
K. Djafri
Keyword(s):  
Patch Antenna ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Open Loop ◽  
Ring Resonators ◽  
Area Network ◽  
Defected Ground Structure ◽  
Total Size ◽  
Antenna Structure ◽  
Loop Ring

In this Article, a novel quadruple-band microstrip patch antenna is proposed for the systems operating at quad-band applications. The antenna structure is composed of modified rectangular patch antenna with a U-shaped defected ground structure (DGS) unit and two parasitic elements (open-loop-ring resonators) to serve as a coupling-bridge. The proposed antenna with a total size of 31×33 mm2 is fabricated and tested. The measured result indicates that the designed antenna has impedance bandwidths for 10 dB return loss reach about 180 MHz (4.4–4.58 GHz), 200 MHz (5.4–5.6 GHz), 1100 MHz (7.2–8.3 GHz), and 700 MHz (9.6–10.3 GHz), which meet the requirements of the wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX), C and X bands applications. Good agreement is obtained between measurement and simulation results.

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