Novel dual open-loop ring resonator for compact planar filters

2016 ◽  
Author(s):  
Roman Tkadlec ◽  
Giuseppe Macchiarella
Keyword(s):  
Ring Resonator ◽  
Open Loop ◽  
Loop Ring ◽  
Compact Planar

scholarly journals Harmonic Suppression Improvement of Microstrip Open Loop Ring Resonator Bandpass Filter

2011 ◽  
Vol 8 ◽  
pp. 19-24 ◽  
Author(s):  
Nopparat Thammawongsa ◽  
Ravee Phromloungsri ◽  
Krissanapong Somsuk ◽  
Pichai Arunvipas
Keyword(s):  
Bandpass Filter ◽  
Ring Resonator ◽  
Open Loop ◽  
Harmonic Suppression ◽  
Loop Ring

Spurious Suppression and Design Based on Microstrip Open Loop Ring Resonator Bandpass Filters

2011 ◽  
Vol E94-C (9) ◽  
pp. 1447-1454
Author(s):  
Pichai ARUNVIPAS ◽  
Chokchai SANGDAO ◽  
Ravee PHROMLOUNGSRI
Keyword(s):  
Ring Resonator ◽  
Bandpass Filters ◽  
Open Loop ◽  
Spurious Suppression ◽  
Loop Ring

scholarly journals Hybrid Microstrip Diplexer Design for Multi-band WiMAX Application in 2.3 and 3.5 GHz Bands

2018 ◽  
Vol 8 (1) ◽  
pp. 576 ◽  
Author(s):  
M. A. Sazali ◽  
N. A. Shairi ◽  
Z. Zakaria
Keyword(s):  
Return Loss ◽  
Ring Resonator ◽  
Filter Design ◽  
Open Loop ◽  
Coupled Line ◽  
Measurement Results ◽  
Coupling Techniques ◽  
Loop Ring ◽  
Insertion Losses ◽  
Multi Band

In this paper, a design of hybrid microstrip diplexer is proposed for multi-band Worldwide Interoperability for Microwave Access (WiMAX) application in 2.3 and 3.5 GHz bands. The diplexer consists of a combination of two different filter designs. These filters were designed based on microstripline coupling techniques in order to obtain minimum insertion losses and achieve the desired frequency bandwidth. Therefore, a coupled open loop ring resonator was chosen for the filter design in 2.3 GHz band and a folded coupled line resonator was chosen for the filter design in 3.5 GHz band. Then, these filters were combined with a ring manifold matching network to be a hybrid microstrip diplexer. Based on the results, good agreements were achieved between the simulation and measurement results in terms of insertion loss, return loss and bandwidth in the 2.3 and 3.5 GHz bands.

scholarly journals Design and Fabrication of Tri-Stopband Bandstop Filters Using Cascaded and Multi-Armed Methods

2017 ◽  
Vol 6 (3) ◽  
pp. 18 ◽  
Author(s):  
A. Boutejdar ◽  
S. D. Bennani
Keyword(s):  
Integrated Circuit ◽  
Ring Resonator ◽  
Open Loop ◽  
Ring Resonators ◽  
Integrated Circuit Design ◽  
Double Ring ◽  
Design Flexibility ◽  
Loop Ring ◽  
Bandstop Filters ◽  
Multi Band

In this paper, we proposed a compact C-open-loop ring resonator and its equivalent circuit. The second cascaded BSF are designed using this simple C-ring resonator. The double ring BPF consists of two cascaded C-ring resonators, which are placed on the RO4003 substrate, while the other triple BSF structure consists of tree cascaded C-ring resonators, which are connected with input and output through microstrip feed lines. The both filters are simulated, optimized and partially realized using MWR simulator and Anritsu E5072A vector network analyzer VNA. In order to reduce the size and to improve the filter characteristics, novel compact filter topologies are designed basing on the previous structures. The proposed multi-band bandstop filters consist of several open-loop ring resonators placed vertically overlapping (coupled multi-armed ring resonator). Using this idea, the filter topologies with design flexibility, close size and excellent results are reached. The novel compact multi-band bandstop filters produce several stopband along a frequency range from DC to 9 GHz, in which each separate band exhibits an acceptable and useful bandwidth. Each stopband has regenerated two reflexion zeros, what leads to a good sharpness factors in the transition domains. Good agreement between the experimental results, full-wave simulation has been achieved. This new filter idea can be very attractive for the nowadays multilayer and compact radio frequency integrated circuit design.

scholarly journals Dual-Band MIMO Antenna for 5G/WLAN Mobile Terminals

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 489
Author(s):  
Jianlin Huang ◽  
Guiting Dong ◽  
Qibo Cai ◽  
Zhizhou Chen ◽  
Limin Li ◽  
...  
Keyword(s):  
Ring Resonator ◽  
Multiple Input Multiple Output ◽  
Open Loop ◽  
Dual Band ◽  
Antenna Element ◽  
Total Efficiency ◽  
Mimo Antenna ◽  
Single Antenna ◽  
Loop Ring ◽  
5 Ghz

This paper presents a dual-band four-element multiple-input-multiple-output (MIMO) array for the fifth generation (5G) mobile communication. The proposed antenna is composed of an open-loop ring resonator feeding element and a T-shaped radiating element. The utilization of the open-loop ring resonator not only reduces the size of the antenna element, but also provides positive cross-coupling. The dimension of a single antenna element is 14.9 mm × 7 mm (0.27λ × 0.13λ, where λ is the wavelength of 5.5 GHz). The MIMO antenna exhibits a dual-band feature from 3.3 to 3.84 GHz and 4.61 to 5.91 GHz, which can cover 5G New Radio N78 (3.3–3.8 GHz), 5G China Band N79 (4.8–5 GHz), and IEEE 802.11 ac (5.15–5.35 GHz, 5.725–5.85 GHz). The measured total efficiency and isolation are better than 70% and 15 dB, respectively. The calculated envelope correlation coefficient (ECC) is less than 0.02. The measured results are in good agreement with the simulated results.

scholarly journals Closed-loop ring resonator topology for bandpass filter applications

2020 ◽  
Vol 17 (3) ◽  
pp. 1422
Author(s):  
Norfishah Ab Wahab ◽  
M. N. Md Tan ◽  
M. N. Hushim
Keyword(s):  
Transmission Lines ◽  
Closed Loop ◽  
Bandpass Filter ◽  
Ring Resonator ◽  
Single Mode ◽  
Ring Structure ◽  
Transmission Zeros ◽  
Quarter Wavelength ◽  
Coupled Lines ◽  
Loop Ring

<p class="Pa41">This paper presents a single mode pseudo-elliptic bandpass resonator based on closed-loop ring topology. The resonator is built from six quarter wavelength transmission lines to form a square closed-loop ring structure. This structure creates transmission zeros at the lower and upper sidebands so that high selectivity bandpass filter response is achieved. The advantage of this topology is that the design is less complex since no perturbation is needed on the ring lines for creation of transmission zeros. Higher-order filters can be constructed by introducing quarter-wavelength coupled-lines, coupled at both input and output of the closed-loop ring resonator. For proof of concept, the filters are designed at 10 GHz up to 3<sup>rd</sup> order, simulated using full-wave electromagnetic simulator on microstrip substrate, <em>FR-4</em> with characteristics given as <em>Ԑr </em>= 4.70, <em>h </em>= 1.499 mm and <em>tan δ </em>= 0.012.  The filters are simulated and responses are found to be agreeable with the proposed idea.</p>

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