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Number of results: 5
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Abstract

Compact radiators with circular polarization are important components of modern mobile communication systems. Their design is a challenging process which requires maintaining simultaneous control over several performance figures but also the structure size. In this work, a novel design framework for multi-stage constrained miniaturization of antennas with circular polarization is presented. The method involves se- quential optimization of the radiator in respect of selected performance figures and, eventually, the size. Optimizations are performed with iteratively increased number of design constraints. Numerical efficiency of the method is ensured using a fast local-search algorithm embedded in a trust-region framework. The proposed design framework is demonstrated using a compact planar radiator with circular polarization. The optimized antenna is characterized by a small size of 271 mm2 with 37% and 47% bandwidths in respect of 10 dB return loss and 3 dB axial ratio, respectively. The structure is benchmarked against the state-of-the-art circular polarization antennas. Numerical results are confirmed by measurements of the fabricated antenna prototype.

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Authors and Affiliations

Adrian Bekasiewicz
Slawomir Koziel
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Abstract

Analytical relations, describing the electrical fields of cylindrical piezoceramic radiators with circular polarization as a member of the cylindrical systems with the baffle in the inner cavity, using the related fields method in multiply connected regions were obtained. Comparative analysis of the results of numerical experiments performed on the frequency characteristics of the electric field of the radiating systems for different modes of radiation allow to establish a number of subtle effects of the formation of the electric field of radiators.

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Authors and Affiliations

Aleksandr Leiko
Anatolii Derepa
Aleksandr Rasstrygin
Andrii Kosiakovskyi
Oksana Kocharian
Yaroslav Starovoit
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Abstract

In this article, a 3D printed rectangular dielectric resonator antenna which is capable of polarization reconfiguration has been designed. Dielectric resonator is composed of environment friendly and biodegradable material, which is Polylactic Acid. In the proposed model, the polarization can be switch from a linear to a circular by changing the state of a switch, electonically. The antenna switch between two different polarizations: Linear polarization during OFF STATE and Lefthand circular polarization during ON STATE. The proposed 3D printed dielectric resonator antenna is designed to operate in Cband of microwave spectrum, with a broad effective bandwidth (overlapped impedance bandwidths of both states) of 14.542% with centre frequency at 5.845GHz and peak gain 5.5dBi. Further, validated simulated results with experiment and both results are in good agreement.
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Authors and Affiliations

Maganti Apparao
1
Godi Karunakar
1

  1. Department of Electronics and Communication Engineering, Gitam Institute of Technology, GITAM Deemed to be University, Visakhapatnam, India
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Abstract

In this article, a hybrid circularly polarized Multiple- Input Multiple-Output (MIMO) antenna for multi-band operation from 2.3 to 9.2 GHz with an impedance bandwidth of 7 GHz is proposed and investigated experimentally. The designed MIMO antenna model has a compact size of 20mm×40mm×1.6mm on the FR-4 substrate. The microstrip feed of the proposed slot antenna consists of a tapered structure, and the radiating element consists of the inverted L- shaped slots, which were opened on both sides of the radiating elements to introduce notches at the sub-6 GHz frequencies. L-shaped stubs are also introduced on another side of the substrate in the common ground plane to attain high isolation between the radiating elements of the proposed antenna. In the operating band from 2.3 to 9.2 GHz, isolation of less than -20 dB is achieved by the proposed model. The performance of the circularly polarized MIMO antenna in terms of RHCP and LHCP radiation patterns, axial ratio, surface current distributions, isolation between the ports, diversity gain (DG), envelope correlation coefficient (ECC), total active reflection coefficient (TARC), and peak gain are studied and presented in this work. The obtained characteristics of the proposed antenna make it suitable for sub-6- GHz frequency applications.
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Bibliography

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[2] Amjad Iqbal, Omar A. Saraereh, Arbab Waheed Ahmad, Shahid Bashir, “Mutual Coupling Reduction Using F-Shaped Stubs in UWB-MIMO Antenna,” IEEE Access, vol. 6, pp. 2755-2759, Dec 2017. https://doi.org/10.1109/ACCESS.2017.2785232.
[3] Abdulrahman Shueai, Mohsen Alqadami, Mohd Faizal Jamlos, Ping Jack Soh, Guy A. E. Vandenbosch. “Assessment of PDMS Technology in a MIMO Antenna Array,” IEEE Antennas and Wireless Propagation Letters, Volume: 15, 2016. https://doi.org/10.1109/LAWP.2015.2513960.
[4] Shraman Gupta, Zouhair Briqech, Abdel Razik Sebak, Tayeb Ahmed Denidni, “Mutual-Coupling Reduction Using Metasurface Corrugations for 28 GHz MIMO Applications,” IEEE Antennas and Wireless Propagation Letters , Volume: 16, Pages: 2763 – 2766, DOP:25 August 2017. https://doi.org/10.1109/LAWP.2017.2745050.
[5] SeaheeHwangbo, Hae Yong Yang, Yong-Kyu Yoon “Mutual Coupling Reduction Using Micromachined Complementary Meander-Line Slots for a Patch Array Antenna,” IEEE Antennas and Wireless Propagation Letter, vol. 16, pp. 1667 – 1670, 2017. https://doi.org/10.1109/LAWP.2017.2663114.
[6] Ullah, Ubaid, Ismail Ben Mabrouk, and Slawomir Koziel. “Enhanced-performance circularly polarized MIMO antenna with polarization/pattern diversity,” IEEE Access Volume:8, 2020. https://doi.org/10.1109/ACCESS.2020.2966052.
[7] Amjad Iqbal, Amor Smida, Abdullah J. Alazani, Mohamed I. Waly, Nazih Khaddaj Mallat. “Wideband Circularly Polarized MIMO Antenna for High Data Wearable Biotelemetric Devices,” IEEE Access Volume: 8, 2020. https://doi.org/10.1109/ACCESS.2020.2967397.
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[10] J.-Y. Deng, L.-X. Guo, and X.-L. Liu, “An ultrawideband MIMO antenna with high isolation,” IEEE Antenna and Wireless Propagation Letters, vol. 15, pp. 182–185, 2016. https://doi.org/10.1109/LAWP.2015.2437713.
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[12] P. Gao, S. He, Z. Xu, and Y. Zheng, “Compact printed UWB diversity slot antenna with 5.5-GHz band-notched characteristics,” IEEE Antenna and Wireless Propagation Letters, vol. 13, pp. 376–379, 2014. https://doi.org/10.1109/LAWP.2014.2305772.
[13] J. Zhu, B. Feng, B. Peng, S. Li, and L. Deng, “Compact CPW UWB diversity slot antenna with dual band-notched characteristics,” Microwave and Optical Technology Letters, vol. 58, no. 4, pp. 989–994, April 2016.
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Authors and Affiliations

S. Salma
1
Habibulla Khan
1
B.T.P. Madhav
1
D. Ram Sandeep
1
M. Suman
1

  1. Dept. of ECE, Koneru Lakshmaiah Education Foundation, AP, India
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Abstract

For high speed downlinking of payload data from small satellites, a new 4×4 aperture coupled microstrip patch array antenna has been presented. The antenna is designed for the Ku band and a peak gain of 18.0 dBi is achieved within the impedance bandwidth from 11.75 GHz to 12.75 GHz. Wide bandwidth is achieved as the patch elements are excited through E-shaped slots having asymmetric side lengths and widths. Each square patch element of the array with truncated corners and appropriately placed slots generates right hand circularly polarized (RHCP) radiation with very high crosspolarization discrimination. A corporate feed network consisting of T-junctions and quarter-wave impedance transformers is developed to feed the array elements from a single coaxial port of 50 Ω. To improve the radiation from the patches and waveguiding in the feed network, two types of Rogers substrates with different dielectric constant and thickness are considered. Our proposed microstrip patch array antenna of size 7.8 cm × 6.4 cm × 0.3 cm can perform efficiently with a downlink data rate as high as 4.6 Gbps for small satellites.
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Authors and Affiliations

Kajol Chandra Paul
1
Anis Ahmed
2

  1. Dept. of Electrical and Electronic Engineering, Jatiya Kabi Kazi Nazrul Islam University, Mymensingh, Bangladesh
  2. Dept. of Electrical and Electronic Engineering, University of Dhaka, Dhaka, Bangladesh

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