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.

scholarly journals Frequency-multiplexed pure-phase microwave meta-holograms using bi-spectral 2-bit coding metasurfaces

Nanophotonics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 703-714 ◽  
Author(s):  
Shahid Iqbal ◽  
Hamid Rajabalipanah ◽  
Lei Zhang ◽  
Xiao Qiang ◽  
Ali Abdolali ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Phase Retrieval ◽  
Dual Band ◽  
Retrieval Algorithm ◽  
Band Frequency ◽  
X Band ◽  
Pure Phase ◽  
Frequency Multiplexing ◽  
Information Channels ◽  
Ku Band

AbstractIn this paper, a dual-band reflective meta-hologram is designed providing two distinct information channels whose field intensity distributions can be independently manipulated at the same time. The proposed pure-phase meta-hologram is composed of several frequency-dispersive coding meta-atoms possessing each of 2-bit digital statuses of “00”, “01”, “10”, and “11” at either the lower (X-band) or the higher (Ku-band) frequency band. Relying on the weighted Gerchberg-Saxton phase retrieval algorithm, different illustrative examples have been provided to theoretically inspect the dual-band performance of our coding meta-hologram. Numerical simulations validate the proposed frequency multiplexing meta-holography with the ability to project two different high-quality images with low cross-talk on two X-band and Ku-band near-field channels located at distinct pre-determined distances from the metasurface plane. As proof of concept, two meta-hologram samples are fabricated, and the experimental results corroborate well the numerical simulations and theoretical predictions. The designed meta-hologram features all fascinating advantages of the coding metasurfaces while its performance overcomes that of previous studies due to providing two information channels rather than the conventional single-channel holography. The frequency multiplexing acquired by the proposed bi-spectral coding meta-hologram may provide great opportunities in a variety of applications, such as data storage and information processing.

scholarly journals Dual-Band Circularly Polarized Shared-Aperture Array for $C$ -/ $X$ -Band Satellite Communications

2017 ◽  
Vol 65 (10) ◽  
pp. 5171-5178 ◽  
Author(s):  
Chun-Xu Mao ◽  
Steven Gao ◽  
Yi Wang ◽  
Qing-Xin Chu ◽  
Xue-Xia Yang
Keyword(s):  
Satellite Communications ◽  
Dual Band ◽  
Circularly Polarized ◽  
X Band ◽  
Aperture Array

A superstrate loaded aperture coupled dual-band circularly polarized dielectric resonator antenna for X-band communications

2020 ◽  
pp. 1-8
Author(s):  
Sounik Kiran Kumar Dash ◽  
Qingsha S. Cheng ◽  
Taimoor Khan
Keyword(s):  
Circular Polarization ◽  
Dielectric Resonator ◽  
Satellite Communications ◽  
Dual Band ◽  
Dielectric Resonator Antenna ◽  
Development Stages ◽  
The Third ◽  
X Band ◽  
Fabrication And Characterization ◽  
Slot Coupling

Abstract A superstrate loaded cylindrical dielectric resonator antenna is developed and demonstrated for dual-band circular polarization. The proposed antenna employs a microstrip-fed rotated cross-shaped slot coupling technique for exciting the dielectric resonator (DR). The design is developed in a straight forward way. Firstly, the DR is coupled with a conventional plus-shaped slot and operates in linear polarization mode at 7.4 and 11.2 GHz. Secondly, the slot is rotated by 10° to enable out-of-phase excitation and ensure circular polarization at the above-mentioned frequencies. In the third step, a square dielectric superstrate is placed above the DR which creates multiple reflection and enhance the gain up to ~8 dBi in both the frequencies without affecting other performances. The development stages are discussed in detail. The proposed design is demonstrated through prototype fabrication and characterization. This antenna can be used for X-band satellite communications.

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.

scholarly journals Ultra-Wideband Reconfigurable X-Band and Ku-Band Metasurface Beam-Steerable Reflector for Satellite Communications

Electronics ◽  
2021 ◽  
Vol 10 (17) ◽  
pp. 2165
Author(s):  
David Rotshild ◽  
Amir Abramovich
Keyword(s):  
Beam Steering ◽  
Satellite Communications ◽  
Unit Cell ◽  
Ultra Wideband ◽  
Design Parameters ◽  
Continuous Control ◽  
Reflection Phase ◽  
X Band ◽  
Phase Reflection ◽  
Ku Band

A continuously reconfigurable metasurface reflector based on unit cell mushroom geometry that was integrated with a varactor diode is presented in this paper. The unit cell of the metasurface was designed and optimized to operate in the X-band and Ku-band, improving satellite communication’s quality of service. The losses mechanisms of continuous control over the unit cell phase reflection in beam steering resolution are considered and the analysis results are presented. The unit cell design parameters were analyzed with an emphasis on losses and dynamic reflection phase range. The unit cell magnitude and phase reflection are shown in the wide frequency bandwidth and showed a good agreement between all the measurements and the simulations. This metasurface enabled a high dynamic range in the unit cell resonant frequency range from 7.8 to 15 GHz. In addition, the reflection phase and absorption calibration are demonstrated for multiple operating frequencies, namely, 11 GHz, 12 GHz, and 13.5 GHz. Furthermore, design trade-offs and manufacturing limitations were considered. Finally, a beam-steering simulation using the designed metasurface is shown and discussed.

A miniaturized flexible frequency selective surface for dual band response

2020 ◽  
pp. 1-7
Author(s):  
Durai Kanchana ◽  
Sankararajan Radha ◽  
Balakrishnapillai Suseela Sreeja ◽  
Esakkimuthu Manikandan
Keyword(s):  
Frequency Response ◽  
Transverse Electric ◽  
Frequency Selective Surface ◽  
Transverse Magnetic ◽  
Dual Band ◽  
Band Frequency ◽  
X Band ◽  
Stable Frequency ◽  
Frequency Selective ◽  
Ku Band

Abstract In this paper, a novel miniaturized and flexible dual band frequency selective surface (FSS) is presented. This FSS provides effective shielding in X-band and Ku- band, with a frequency response of 9.4 and 16.7 GHz, respectively. The proposed FSS provides 924 MHz bandwidth at X-band and 1.34 GHz bandwidth at Ku-band with an insertion loss of 20 dB. Moreover, the proposed design is polarization-independent and it provides stable frequency response at various angles of incidences for both transverse electric and transverse magnetic modes. More significantly, the proposed FSS analyzed the bandstop response of the selective frequency and also is suitable for conformal applications. A prototype of the proposed FSS is fabricated. The measured results and simulated results are good in agreement.

scholarly journals Design of dual and Wideband Rectangular Patch Antenna for C and X Band Applications

2018 ◽  
Vol 7 (5) ◽  
pp. 145-150 ◽  
Author(s):  
S. Lakrit
Keyword(s):  
Patch Antenna ◽  
Satellite Communications ◽  
Microstrip Antennas ◽  
Dual Band ◽  
Wireless Applications ◽  
Rectangular Patch ◽  
Narrow Bandwidth ◽  
X Band ◽  
Resonance Frequencies ◽  
Radar Satellite

In this paper, we resolve two issues of microstrip antennas, which are miniaturization and efficiency behavior. For  that, a rectangular patch antenna with 16×18×1.6 mm3 dimensions with dual-band characteristics, was designed, fabricated and characterized.  In order to improve the problem of narrow bandwidth in  microstrip antennas, we implement in this study the slot  technique, allowing us to achieve our purpose. This technique,  lead to a good reflection coefficient and VSWR. The  characteristics of the fabricated antenna were measured and  analyzed by Vector Network Analyzer. The results show two  resonance frequencies that define two bandwidths defined by a  return loss less than -10 dB and are respectively; 7.47 GHz at a  frequency of 400 MHz, and 11.01 GHz at a frequency of 790  MHz. Also, the obtained gain has a good value and it’s very  remarkable according to the small size of the structure, with  a peak value of 6.1 dB at 12.5 GHz.  The small size and good characteristics enlarged the applications  domains of our structure, from telecommunications and  especially Radar, satellite communications to medical and  wireless applications.

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