Abstract
The narrow bandwidth and low gain performances of a reflectarray are generally improved at the cost of high design complexity, which is not a good sign for high-frequency operation. A dual resonance asymmetric patch reflectarray antenna with a single layer is proposed in this work for 5G communication at 26 GHz. The asymmetric patch is developed from a square patch by tilting its one vertical side by a carefully optimized inclination angle. A progressive phase range of 650° is acquired by embedding a circular ring slot in the ground plane of the proposed element for gain improvement. A 332-element, center feed reflectarray is designed and tested, where its high cross polarization is suppressed by mirroring the orientation of asymmetric patches on its surface. The asymmetric patch reflectarray offers a 3 dB gain bandwidth of 3 GHz, which is 4.6% wider than the square patch reflectarray. A maximum measured gain of 24.4 dB has been achieved with an additional feature of dual linear polarization. Simple design with wide bandwidth and high-gain of asymmetric patch reflectarray make it suitable to be used in 5G communications at high frequencies.
Highlights
Antennas for 5G can be divided into two categories, one that is required at the user end and a second that is needed at the base station
Change in the ground ring radius for the fabricated unit cells can be spotted from Figure 5a, while all the asymmetric patch elements have the same size
The bandwidth performance of the reflectarray antenna has been enhanced using asymmetric patch elements that support high-gain operation with dual linear polarization
Summary
Haizal Jamaluddin 2, * , Fauziahanim C. Seman 1, * , Muhammad Inam Abbasi 3 , Adel Y. Ramlee Kamarudin 1 and Omar Hayat 4. Wireless Communication Centre of Universiti Teknologi Malaysia (UTM), Johor Bahru 81310, Malaysia
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