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

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.

Download Full-text

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

Advanced Electromagnetics ◽

10.7716/aem.v6i3.573 ◽

2017 ◽

Vol 6 (3) ◽

pp. 59 ◽

Cited By ~ 13

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.

Download Full-text

Millimeter-wave microstrip diplexer using elliptical open-loop ring resonators for next generation 5G wireless applications

Microwave and Optical Technology Letters ◽

10.1002/mop.29506 ◽

2015 ◽

Vol 58 (1) ◽

pp. 106-110

Author(s):

Osama M. Haraz ◽

Nadeem Ashraf ◽

Sultan Almorqi ◽

Hussein Shaman ◽

Saleh A. Alshebeili ◽

...

Keyword(s):

Millimeter Wave ◽

Open Loop ◽

Ring Resonators ◽

Next Generation ◽

Wireless Applications ◽

Loop Ring

Download Full-text

Fabrication of Compact Microstrip Line-Based Balun-Bandpass Filter with High Common-Mode Suppression

Mathematical Problems in Engineering ◽

10.1155/2014/985064 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6

Author(s):

Chia-Mao Chen ◽

Shoou-Jinn Chang ◽

Yen-Liang Pan ◽

Cheng-Yi Chen ◽

Cheng-Fu Yang

Keyword(s):

High Performance ◽

Bandpass Filter ◽

Open Loop ◽

Ring Resonators ◽

Center Frequency ◽

Coupled Line ◽

Common Mode ◽

New Device ◽

Line Theory ◽

Loop Ring

A new type of balun-bandpass filter was proposed based on the traditional coupled-line theory and folded open-loop ring resonators (OLRRs) configuration. For that, a new device with both filter-type and balun-type characteristics was investigated and fabricated. Both magnetic and electric coupling structures were implemented to provide high performance balun-bandpass responses. The fabricated balun-bandpass filters had a wide bandwidth more than 200 MHz and a low insertion loss less than 2.51 dB at a center frequency of 2.6 GHz. The differences between the two outputs were below 0.4 dB in magnitude and within 180 ± 7° in phase. Also, the balun-bandpass filter presented an excellent common-mode rejection ratio over 25 dB in the passband. An advanced design methodology had been adopted based on EM simulation for making these designed parameters of OLRRs, microstrip lines, and open stubs. The measured frequency responses agreed well with simulated ones.

Download Full-text