scholarly journals Metasurfaces for Reconfiguration of Multi-Polarization Antennas and Van Atta Reflector Arrays

Electronics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 1262
Author(s):  
Mohammed Alharbi ◽  
Meshaal A. Alyahya ◽  
Subramanian Ramalingam ◽  
Anuj Y. Modi ◽  
Constantine A. Balanis ◽  
...  
Keyword(s):  
Surface Wave ◽  
Antenna Arrays ◽  
Performance Enhancement ◽  
High Gain ◽  
Wave Antenna ◽  
Recent Developments ◽  
Four Square ◽  
And Performance ◽  
Retrodirective Array ◽  
Ring Elements

This paper discusses the application of metasurfaces for three different classes of antennas: reconfiguration of surface-wave antenna arrays, realization of high-gain polarization-reconfigurable leaky-wave antennas (LWAs), and performance enhancement of van Atta retrodirective reflectors. The proposed surface-wave antenna is designed by embedding four square ring elements within a metasurface, which improves matching and enhances the gain when compared to conventional square-ring arrays. The design for linear polarization comprises of a 1 × 4 arrangement of ring elements, with a 0.56λ spacing, placed amidst periodic patches. A 2 × 2 arrangement of ring elements is utilized for reconfiguration from linear to circular polarization, where a similar peak gain with better port isolation is realized. A prototype of the 2 × 2 array is fabricated and measured; a good agreement is observed between simulations and measurements. In addition, the concepts of the design of polarization-diverse holographic metasurface LWAs that form a pencil beam in the desired direction with a reconfigurable polarization are discussed. Moreover, recent developments incorporating polarization-reconfigurability in metasurface LWAs are briefly reviewed. In the end, the theory of van Atta arrays is outlined and their monostatic RCS is reviewed. A conventional retrodirective array is designed using aperture-coupled patch antennas with a microstrip-line feeding network, where the scattering from the structure itself degrades the performance of the reflector. This is followed by the integration of judiciously synthesized metasurfaces to reconfigure and improve the performance of retrodirective reflectarrays by removing the above-mentioned undesired scattering from the structure.

A metasurfaced surface-wave antenna with performance enhancement

2017 ◽  
Vol 31 (11-12) ◽  
pp. 1167-1176 ◽  
Author(s):  
Guirong Feng ◽  
Xiaowei Shi ◽  
Lei Chen ◽  
Hao Yue ◽  
Yaozhou Yang
Keyword(s):  
Surface Wave ◽  
Performance Enhancement ◽  
Wave Antenna

scholarly journals A Low-Profile End-Fire Conformal Surface Wave Antenna with Capacitive Feed Structure

Sensors ◽  
2020 ◽  
Vol 20 (24) ◽  
pp. 7054
Author(s):  
Legen Dai ◽  
Yongjun Xie ◽  
Huai Wang
Keyword(s):  
Surface Wave ◽  
High Gain ◽  
Metal Plate ◽  
Center Frequency ◽  
Fire Performance ◽  
Flight Vehicles ◽  
Operating Wavelength ◽  
Wave Antenna ◽  
Low Profile ◽  
Profile Height

A high end-fire gain, low-profile surface wave antenna with capacitive feed structure is presented in this paper. The proposed dielectric-metal surface wave antenna is composed of a dielectric slab that is mounted on a metal carrier and a low-profile feed structure. The feed structure is composed of a monopole radiation pin that is loaded with a circular metal plate and a grounding pin. The profile height of the antenna is only one-tenth of the operating wavelength. With a good end-fire performance and low profile, the antenna is very suitable to be conformally mounted on the surface of flight vehicles. The proposed antenna was designed and manufactured at the center frequency of 6 GHz. Measured results demonstrated that the proposed antenna had a bandwidth of 7.33%, ranging from 5.89 to 6.33 GHz, and the antenna reached a high gain of 9.76 dBi with a length of 122.96 mm (2.45 λ) in the end-fire direction.

scholarly journals Performance Enhancement Techniques for Patch Antennas of Small Satellites

2021 ◽  
Author(s):  
Zizung Yoon ◽  
Mayank Mayank ◽  
Enrico Stoll
Keyword(s):  
Antenna Arrays ◽  
Patch Antenna ◽  
Power Flow ◽  
Performance Enhancement ◽  
Ground Plane ◽  
High Gain ◽  
Patch Antennas ◽  
Small Satellite ◽  
Rectangular Patch ◽  
Satellite Missions

Patch antennas are compact, less complex, planar structures and therefore, widely used in small satellite missions for telecommand, data link, and intersatellite link, particularly in S- band and X- band. Improved performance of these patch antennas in terms of gain and compactness will di-rectly affect the communication efficiency of small satellite missions. Especially the coming IoT (Internet of Things) constellations require high gain and efficient antenna arrays. An optimization of single patch antenna elements is an important cornerstone for the missions. Therefore, the ef-fects of various antenna enhancement techniques, such as slotted ground plane, resistor and ca-pacitor integration, parasitic patch elements, are analyzed. These techniques were applied on a rectangular patch antenna with parameter variation to identify the optimal performances with respect to bandwidth, operating frequency, gain, polarization, and power flow. Finally, the techniques were combined to obtain an optimized antenna in terms of gain and compactness. The results were compared to a slotted reference antenna. For the scenario of a 2.4 GHz patch antenna, a gain optimization of 27 % (from 7.09 to 8.14 dBi) or size reduction of 52 % (from 96.04 to 46.2 cm²) could be achieved. Overall, our study revealed an effective way to increase the patch antenna performance, which can directly contribute to more efficient communication links and design of antenna arrays.

scholarly journals Parasitic Motion Principle (PMP) Piezoelectric Actuators: Definition and Recent Developments

2021 ◽  
Author(s):  
Lin Zhang ◽  
Hu Huang
Keyword(s):  
Basic Principle ◽  
Performance Enhancement ◽  
Piezoelectric Actuators ◽  
Fast Response ◽  
High Accuracy ◽  
Characteristic Analysis ◽  
Parasitic Motion ◽  
Key Points ◽  
Recent Developments ◽  
And Performance

Stepping piezoelectric actuators have achieved significant improvements to satisfy the urgent demands on precision positioning with the capability of long working stroke, high accuracy and micro/nano-scale resolution, coupled with the merits of fast response and high stiffness. Among them, inchworm type, friction-inertia type, and parasitic type are three main types of stepping piezoelectric actuators. This chapter is aimed to introduce the basic definition and typical features of the parasitic motion principle (PMP), followed by summarizing the recent developments and achievements of PMP piezoelectric actuators. The emphasis of this chapter includes three key points, the structural optimization, output characteristic analysis and performance enhancement. Finally, the current existing issues and some potential research topics in the future are discussed. It is expected that this chapter can assist relevant researchers to understand the basic principle and recent development of PMP piezoelectric actuators.

Dielectric-based leaky-wave antenna for high gain using a printed surface-wave source

2010 ◽  
Vol 46 (23) ◽  
pp. 1537 ◽  
Author(s):  
S.K. Podilchak ◽  
A.P. Freundorfer ◽  
Y.M.M. Antar ◽  
S.F. Mahmoud
Keyword(s):  
Surface Wave ◽  
High Gain ◽  
Leaky Wave ◽  
Wave Source ◽  
Leaky Wave Antenna ◽  
Wave Antenna
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