scholarly journals Mechanically Reconfigurable, Beam-Scanning Reflectarray and Transmitarray Antennas: A Review

2021 ◽  
Vol 11 (15) ◽  
pp. 6890
Author(s):  
Mirhamed Mirmozafari ◽  
Zongtang Zhang ◽  
Meng Gao ◽  
Jiahao Zhao ◽  
Mohammad Mahdi Honari ◽  
...  
Keyword(s):  
Performance Metrics ◽  
Efficiency Gain ◽  
Beam Scanning ◽  
Gain Bandwidth ◽  
Aperture Efficiency ◽  
Antenna Performance ◽  
Scanning Range

We review mechanically reconfigurable reflectarray (RA) and transmitarray (TA) antennas. We categorize the proposed approaches into three major groups followed by a hybrid category that is made up of a combination of the three major approaches. We discuss the examples in each category and compare their performance metrics including aperture efficiency, gain, bandwidth and scanning range and resolution. We also identify opportunities to build upon or extend these demonstrated approaches to realize further advances in antenna performance.

Compact line source generator for feeding continuous transverse stub arrays

2021 ◽  
pp. 1-12
Author(s):  
Houtong Qiu ◽  
Xue-Xia Yang ◽  
Meiling Li ◽  
Zixuan Yi
Keyword(s):  
Line Source ◽  
Cylindrical Wave ◽  
Center Frequency ◽  
Continuous Beam ◽  
Cross Polarization ◽  
Beam Scanning ◽  
Rotationally Symmetric ◽  
Planar Wave ◽  
Scanning Range ◽  
Polarization Level

Abstract Based on a substrate integrated lens (SIL), a compact line source generator (LSG) for feeding continuous transverse stub (CTS) arrays with linear-polarized (LP) beam scanning and dual-polarized (DP) operations is presented in this paper. The SIL consists of metamaterial cells with different sizes being arranged as concentric annulus and is printed on the center surface of two substrate layers. The SIL can convert the cylindrical wave generated by the feed probe of SIW-horn to the planar wave for feeding the CTS array. This rotationally symmetric SIL can be used conveniently to design LSG for feeding CTS arrays with the continuous beam scanning and DP operations, which has been verified by the fabrications and measurements. By simply rotating the SIW-horn along the edge of SIL, the 10-element LP-CTS array obtains a measured beam scanning range of ±35° with the highest gain of 20.6 dBi. By setting two orthogonal SIW-horns at the edge of the proposed SIL, the nine-element DP-CTS array with orthogonal radiation stubs is excited. The DP array obtains the gain of 20.3 dBi at the center frequency with the isolation of 28 dB and the cross-polarization level <−25 dB.

scholarly journals Dual-Beam and Tri-Band SIW Leaky-Wave Antenna With Wide Beam Scanning Range Including Broadside Direction

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 176361-176368 ◽  
Author(s):  
Yunjie Geng ◽  
Junhong Wang ◽  
Zheng Li ◽  
Yujian Li ◽  
Meie Chen ◽  
...  
Keyword(s):  
Leaky Wave ◽  
Beam Scanning ◽  
Wide Beam ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Dual Beam ◽  
Scanning Range

scholarly journals Wide Band Millimeter Wave Fabric Antenna for 60GHz Applications

2019 ◽  
Vol 8 (9) ◽  
pp. 1211-1214
Keyword(s):  
Millimeter Wave ◽  
Data Communication ◽  
Wide Band ◽  
Processing Unit ◽  
60 Ghz ◽  
Gain Bandwidth ◽  
High Data ◽  
Antenna Performance ◽  
Communication Device ◽  
Millimeter Wave Antenna

A Fabric antenna is used for on body communications. Millimeter wave antenna consists of small beams with high frequency and high directive improves high data communication. It helps us to reduce the barring between user and communication device. This proposed antenna is designed at 60 GHz. It has mainly integrated with wireless sensor network and medical applications. This antenna is designed with the help of HFSS Software. Later HFSS can be explained in the simulation tool. The aim of the paper is, in human body we will insert cloth sensors to monitor different physiological parameters regardless of the patient location. The information passed instantly to the doctor using an external processing unit. In case of any emergency the patient is alerted through appropriate message or alarms. Designed antenna dimensions are 27.3 mm × 8.5 mm × 0.8 mm. Antenna performance is analyzed by using simulated results of reflection co-efficient, VSWR, gain, bandwidth and directivity.

scholarly journals Development of an X-Band Reflectarray Antenna for Satellite Communications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bing Ma ◽  
Fan Lu ◽  
Guoping Zhi ◽  
Xin Xue ◽  
Xiangni Zhao ◽  
...  
Keyword(s):  
Circular Polarization ◽  
Satellite Communications ◽  
Gain Bandwidth ◽  
Aperture Efficiency ◽  
Microstrip Patch ◽  
Right Hand ◽  
X Band ◽  
Reflectarray Antenna ◽  
Ring Elements

AbstractAn X-band reflectarray antenna using 16 × 12 double square ring elements for satellite communications is proposed in this paper. The feed is a 4 × 3 elements microstrip patch array designed to create edge taper of approximately − 10 dB. A prototype with right-hand circular polarization (RHCP) is manufactured and tested, and the good agreements between simulations and measurements are demonstrated. The good performance is obtained with the aperture efficiency of 40.7% and the 3-dB gain bandwidth of about 10% which is beneficial to nanosatellites.

Investigation into the feasibility of inductively coupled antenna for use in smart clothing

2014 ◽  
Vol 26 (1) ◽  
pp. 25-37 ◽  
Author(s):  
Minyoung Suh ◽  
Katherine E. Carroll ◽  
Edward Grant ◽  
William Oxenham
Keyword(s):  
Performance Metrics ◽  
Systems Approach ◽  
Real Life ◽  
Relative Displacement ◽  
The Body ◽  
Content Type ◽  
Inductively Coupled ◽  
Smart Clothing ◽  
Antenna Performance ◽  
The Impact

Purpose – This research investigated the feasibility of using an inductively coupled antenna as the basis of applying a systems approach to smart clothing. In order to simulate real-life situations, the impact of the distortions and relative displacement of different fabric layers (with affixed antennas) on the signal quality was assessed. The paper aims to discuss these issues. Design/methodology/approach – A spiral antenna was printed on different fabric substrates. Obstructive conditions of the inductively coupled fabric layers were investigated to find out how much influence these conditions had on transmission performance. Reflected signals and transmitted signals were observed, while fabric antennas were subjected to displacement (distance and dislocation) or deformation (stretching and bending). The threshold of physical obstacles was estimated based on statistical analyses. Findings – The limits of physical conditions that enable proper wireless transmission were estimated up to ∼2 cm for both distance and dislocation, and ∼0.24 K for bending deformation. The antenna performance remained within an acceptable level of 20 percent transmission up to 10 percent fabric stretch. Based on well-established performance metrics used in clothing environment on the body, which employs 2-5 cm of ease, the results imply that the inductively coupled antennas may be suitable for use in smart clothing. Originality/value – This research demonstrates that the use of inductively coupled antennas on multiple clothing layers could offer the basis of a new “wireless” system approach to smart clothing. This would not only result in performance benefits, but would also significantly improve the aesthetics of smart clothing which should result in new markets for such products.

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