Abstract
This article presents a planar monopole antenna on flexible substrate for middle band 5G (3.5 GHz) application in Malaysia. The antenna has been designed and optimized for its gain and efficiency with an improved performance in contrast of flexible substrate-based other antennas. The antenna resonates at 3.53 GHz and it has a -10dB bandwidth of 545 MHz. The bending effects of this antenna on the S-parameter and gain have also been investigated. The antenna is able to suppress all the other frequency bands until 20 GHz. The designed antenna has been utilized with a newly designed rectifier to act as an rectenna at 3.5 GHz for RF energy harvesting applications. A reasonable amount of DC output voltage of 930 mV, and a Power Conversion Efficiency of 43.5% have been obtained while 0 dBm RF input power is delivered to the rectifier input terminal. Apart from the utilization as an energy harvester being connected with the proposed rectifier, the designed antenna on flexible substrate can also be employed to biomedical and sensor applications.
Highlights
According to the recent allocation of 5G by Malaysian Communications and Multimedia Commission (MCMC) for mobile broadband services, three different frequency bands of 700 MHz, 3.5G Hz, and 26/28 GHz are going to be utilized for future 5G applications [1]
It clearly demonstrates that other frequency bands are suppressed by the designed antenna
A planar keyhole-shaped monopole antenna with partial ground plane has been designed, and its performance has been analyzed for 3.5 GHz
Summary
According to the recent allocation of 5G by Malaysian Communications and Multimedia Commission (MCMC) for mobile broadband services, three different frequency bands of 700 MHz, 3.5G Hz, and 26/28 GHz are going to be utilized for future 5G applications [1]. In [3], a dipole rectenna is proposed on the flexible substrate for the energy. The efficiency of the whole rectenna system is very low as 0.6% Another planar microstrip DGS antenna has been proposed in [9] to harvest the RF energy between 1 GHz to 5 GHz. The antenna as has a decent size of 45 41 mm. The proposed antenna has a small realized gain of only 2.7 dBi. In this work, a monopole antenna has been designed and integrated with a new rectifier to improve the antenna gain and the power conversion efficiency (PCE) without any distinct impedance network between the antenna and the rectifier.
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