Performance Improvement of RFID Reader Antenna Using Spiral Split Ring Resonators

2016 ◽  
Vol 6 (6) ◽  
pp. 381 ◽  
Author(s):  
Mahdi Abdelkarim ◽  
Seif Naoui ◽  
Ali Gharsallah
Keyword(s):  
Performance Improvement ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Rfid Reader ◽  
Reader Antenna

Application of SRRs in conventional waveguide slot array to achieve performance improvement and dual-band characteristics

2016 ◽  
Vol 9 (5) ◽  
pp. 1085-1091 ◽  
Author(s):  
Avinash Chandra ◽  
Sushrut Das
Keyword(s):  
Equivalent Circuit ◽  
Performance Improvement ◽  
Return Loss ◽  
Transverse Plane ◽  
Ring Resonators ◽  
Dual Band ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Waveguide Slot ◽  
Slotted Waveguide

This paper presents application of split ring resonators (SRR) in conventional waveguide slot array antenna to achieve performance improvement and multiband characteristics. Three SRRs have been placed on the transverse plane of a conventional slotted waveguide and has been simulated and measured. The measured results show that the antenna has dual band response with respective 10 dB return loss bandwidth 8.23–9.23 GHz (11.45%) and 9.68–11.01 GHz (12.87%). The measured gain and radiation pattern reveal that the proposed antenna has higher gain and front to back radiation ratio as compared with a conventional slotted waveguide antenna. Equivalent circuit of the proposed antenna also has been presented.

scholarly journals Terahertz sensor with resonance enhancement based on square split-ring resonators

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Zhonggang Xiong ◽  
Liping Shang ◽  
Jieping Yang ◽  
Linyu Chen ◽  
Jin Guo ◽  
...  
Keyword(s):  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Resonance Enhancement

scholarly journals Passively Tunable Terahertz Filters Using Liquid Crystal Cells Coated with Metamaterials

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 381
Author(s):  
Wei-Fan Chiang ◽  
Yu-Yun Lu ◽  
Yin-Pei Chen ◽  
Xin-Yu Lin ◽  
Tsong-Shin Lim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Ring Resonators ◽  
Maximum Frequency ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Terahertz Region ◽  
Resonance Frequencies ◽  
Terahertz Communication ◽  
Terahertz Sensing ◽  
Crystal Cells

Liquid crystal (LC) cells that are coated with metamaterials are fabricated in this work. The LC directors in the cells are aligned by rubbed polyimide layers, and make angles θ of 0°, 45°, and 90° with respect to the gaps of the split-ring resonators (SRRs) of the metamaterials. Experimental results display that the resonance frequencies of the metamaterials in these cells increase with an increase in θ, and the cells have a maximum frequency shifting region of 18 GHz. Simulated results reveal that the increase in the resonance frequencies arises from the birefringence of the LC, and the LC has a birefringence of 0.15 in the terahertz region. The resonance frequencies of the metamaterials are shifted by the rubbing directions of the polyimide layers, so the LC cells coated with the metamaterials are passively tunable terahertz filters. The passively tunable terahertz filters exhibit promising applications on terahertz communication, terahertz sensing, and terahertz imaging.

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