scholarly journals Frequency scanning antenna arrays with metamaterial based phased shifters

2019 ◽  
Vol 32 (3) ◽  
pp. 449-461
Author(s):  
Nikola Boskovic ◽  
Branka Jokanovic ◽  
Vera Markovic
Keyword(s):  
Antenna Arrays ◽  
Side Lobe ◽  
Phase Shifters ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Frequency Scanning ◽  
Suppression Phase ◽  
And Control ◽  
Scanning Antenna

This paper presents a simple design of linear series-fed frequency scanning antenna arrays with: (a) identical rectangular dipoles and (b) pentagonal dipoles having different impedances to provide enhanced side lobe suppression. Phase shifters are designed as a metamaterial unit cell consisting of split-ring resonators coupled with the parallel microstrip line. Shifter models variations are described and control of phase is demonstrated. Two antenna arrays are manufactured and measured.

scholarly journals Frequency scanning antenna arrays with pentagonal dipoles of different impedances

2015 ◽  
Vol 12 (1) ◽  
pp. 99-108 ◽  
Author(s):  
Nikola Boskovic ◽  
Branka Jokanovic ◽  
Aleksandar Nesic
Keyword(s):  
Antenna Array ◽  
Antenna Arrays ◽  
Side Lobe ◽  
Side Lobe Level ◽  
Scanning Angle ◽  
Frequency Scanning ◽  
Wide Range ◽  
Scanning Antenna ◽  
Antenna Characteristics

In this work we present the benefits of using pentagonal dipoles as radiating elements instead of classical printed dipoles in the design of frequency scanning antenna arrays. We investigate how impedance of pentagonal dipoles, which can be changed in a wide range, influences the overall characteristics of the uniform antenna array. Some very important antenna characteristics such as side lobe level, gain and scanning angle are compared for three different antenna arrays consisting of identical pentagonal dipoles with impedances of 500 ?, 1000 ? and 1500 ?.

Application of complementary split ring resonators for size reduction in patch antenna arrays

2017 ◽  
Vol 31 (16) ◽  
pp. 1755-1768 ◽  
Author(s):  
Erik Fritz-Andrade ◽  
Jose Alfredo Tirado-Mendez ◽  
Hildeberto Jardon-Aguilar ◽  
Ruben Flores-Leal
Keyword(s):  
Antenna Arrays ◽  
Patch Antenna ◽  
Size Reduction ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators

scholarly journals E-Textile Metamaterials: Stop Band Pass Filter

2021 ◽  
Vol 11 (22) ◽  
pp. 10930
Author(s):  
Bahareh Moradi ◽  
Raul Fernández-García ◽  
Ignacio Gil Gali
Keyword(s):  
Stop Band ◽  
Ring Resonators ◽  
Band Pass Filter ◽  
Split Ring ◽  
Pass Filter ◽  
Split Ring Resonators ◽  
Device Applications ◽  
Band Pass ◽  
Filter Signal ◽  
And Control

In this paper, the utilization of common fabrics for the manufacturing of e-textile metamaterial is investigated. The proposed design is based on a transmission line loaded with split-ring resonators (SRRs) on a cotton substrate for filter signal application. The proposed design provides a stop band between 2.7 GHz and 4.7 GHz, considering a four stage SRR topology. Experimental results showed stop band levels higher than −30 dB for the proposed compact embroidered metamaterial e-textiles. The validated results confirmed embroidery as a useful technique to obtain customized electromagnetic filter properties, such as transmitted signal filtering and control, on wearable tech device applications.

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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