scholarly journals Line Defect-Layered EBG Waveguides in Dielectric Substrates

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Hassna Ouassal ◽  
Jafar Shaker ◽  
Langis Roy ◽  
Khelifa Hettak ◽  
Reza Chaharmir
Keyword(s):  
Size Structure ◽  
Single Layer ◽  
Phase Shifters ◽  
Slab Waveguide ◽  
Line Defect ◽  
Dielectric Substrates ◽  
Structure Reliability ◽  
Design Flexibility ◽  
Dielectric Spacer ◽  
X Band

A dielectric-based multilayer structure composed of U-shaped rings (ML-UR) is used to develop a class of novel electromagnetic band gap (EBG) slab waveguide. The structure has two band gaps that narrow down as dielectric constant is increased. The EBG slab waveguide is created by embedding a single-layer line defect inside the 3D crystal of the EBG slab guide. Unlike our previously published foam-based EBG structure, the use of dielectric spacer in the EBG waveguides offers significant advantages in terms of overall size, structure reliability, and design flexibility. The waveguide structures reported in this paper are designed to operate at X-band (8–12 GHz) while being fed by coplanar-slotline transitions. Prototypes were fabricated and characterized experimentally. The insertion loss decreases by decreasing the number of full lattices of ML-UR surrounding the channels. The proposed waveguide has potential in microwave components such as directional couplers, phase shifters, and antenna array feeding networks.

Ultra-wideband and wide-angle linear-to-circular polarizer based on single-layer dielectric substrates

2021 ◽  
Vol 127 (11) ◽  
Author(s):  
Shuangshuang Zhu ◽  
Guodong Zhao ◽  
Zhongming Yan ◽  
Yu Wang ◽  
Hongcheng Zhou
Keyword(s):  
Single Layer ◽  
Ultra Wideband ◽  
Wide Angle ◽  
Dielectric Substrates ◽  
Circular Polarizer

A Highly Efficient Dual-Band Transmitarray Antenna Using Cross and Square Rings Elements

2021 ◽  
Vol 36 (7) ◽  
pp. 852-857
Author(s):  
Yongliang Zhang ◽  
Xiuzhu Lv ◽  
Jiaxuan Han ◽  
Shuai Bao ◽  
Yao Cai ◽  
...  
Keyword(s):  
Satellite Communications ◽  
Dual Band ◽  
Band Ratio ◽  
Maximum Gain ◽  
Aperture Efficiency ◽  
Dielectric Substrates ◽  
Highly Efficient ◽  
X Band ◽  
Transmission Phase ◽  
Ku Band

In this paper, a highly efficient dual-band transmitarray antenna using cross and square rings elements is presented for X and Ku bands. The dual-band transmitarray is designed for downlink/uplink frequencies of Ku band satellite communications. The transmitarray element consists of four metal patches and two dielectric substrates. The metal patch is printed on both sides of the substrate. By optimizing the parameters, the transmitarray element can achieve a transmission phase coverage greater than 360° and work independently in both frequency bands. Then, a method to select the size of the element is proposed, so that all the elements in the array can realize the transmission phase of the two frequencies as much as possible. A 201-elements transmitarray antenna is fabricated and measured and the band ratio of the antenna is 1.13. The measured maximum gain at 11.5 GHz is 22.4 dB, corresponding to the aperture efficiency is 52.7%. The measured maximum gain at 13 GHz is 24.2 dB, corresponding to the aperture efficiency is 62.4%. The 1-dB gain bandwidths are 9.7% (10.8-11.9 GHz) at X band and 9% (12.6-13.8 GHz) at Ku band.

Bandwidth improvement of planar antennas using a single-layer metamaterial substrate for X-band application

2020 ◽  
Vol 12 (9) ◽  
pp. 906-914
Author(s):  
O. Borazjani ◽  
M. Naser-Moghadasi ◽  
J. Rashed-Mohassel ◽  
R. A. Sadeghzadeh
Keyword(s):  
Microstrip Antenna ◽  
Single Layer ◽  
Dual Band ◽  
Planar Antennas ◽  
Radiation Characteristics ◽  
Dual Band Antenna ◽  
X Band ◽  
Field Radiation ◽  
Metallic Ring ◽  
Good Agreement

AbstractTo prevent far-field radiation characteristics degradation while increasing bandwidth, an attempt has been made to design and fabricate a microstrip antenna. An electromagnetic band gap (EBG) structure, including a layer of a metallic ring on a layer of Rogers 4003C substrate, is used. For a better design, a patch antenna with and without the EBG substrate has been simulated. The results show that the bandwidth can be improved up to 1.6 GHz in X-band by adding the EBG substrate. Furthermore, using this structure, a dual-band antenna was obtained as well. Finally, to validate the simulation results, a comparison has been done between simulation data and experimental results which demonstrate good agreement.

scholarly journals A Compact Single Layer Reflectarray Antenna Based on Circular Delay-Lines for X-band Applications

2018 ◽  
Vol 27 (2) ◽  
pp. 440-447 ◽  
Author(s):  
T. Shabbir ◽  
R. Saleem ◽  
S. U. Rehman ◽  
M. F. Shafique
Keyword(s):  
Single Layer ◽  
Delay Lines ◽  
X Band ◽  
Reflectarray Antenna

Ultra-Multilevel-Storage Phase Change Memory

2014 ◽  
Vol 936 ◽  
pp. 599-602
Author(s):  
You Yin ◽  
Sumio Hosaka
Keyword(s):  
Phase Change ◽  
Phase Change Memory ◽  
Single Layer ◽  
Programming Method ◽  
Promising Method ◽  
Device Structure ◽  
Material Engineering ◽  
Structure Reliability ◽  
Multilevel Storage ◽  
Change Memory

In this study, we investigated ultra-multilevel-storage (UMLS) in lateral phase change memory (PCM) on the basis of device structure, reliability and programming method. We found that the number of resistance levels was limited strictly by the number of PC layers in multilayer multilevel cell (ML-MLC). A number of distinct levels up to 16 were obtained using a simple single-layer multilevel cell (SL-MLC). And material engineering is expected to greatly improve the reliability of MLS. We believe that fast-freely-achievable (FFA)-MLC by stair-like-pulse programming is a very promising method for futures application.

X-band RF MEMS phase shifters for phased array applications

1999 ◽  
Vol 9 (12) ◽  
pp. 517-519 ◽  
Author(s):  
A. Malczewski ◽  
S. Eshelman ◽  
B. Pillans ◽  
J. Ehmke ◽  
C.L. Goldsmith
Keyword(s):  
Phased Array ◽  
Rf Mems ◽  
Phase Shifters ◽  
X Band
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