Abstract
This paper presented a new circular polarization reconfigurable antenna for 5G wireless communications. The antenna, containing a semicircular slot, was compact in size and had a good axial ratio and frequency response. Two PIN diode switches controlled the reconfiguration for both the right-hand and left-hand circular polarization. Reconfigurable orthogonal polarizations were achieved by changing the states of the two PIN diode switches, and the reflection coefficient |S11| was maintained, which is a strong benefit of this design. The proposed polarization-reconfigurable antenna was modeled using the Computer Simulation Technology (CST) software. It had a 3.4 GHz resonance frequency in both states of reconfiguration, with a good axial ratio below 1.8 dB, and good gain of 4.8 dBic for both modes of operation. The proposed microstrip antenna was fabricated on an FR-4 substrate with a loss tangent of 0.02, and relative dielectric constant of 4.3. The radiating layer had a maximum size of 18.3 × 18.3 mm2, with 50 Ω coaxial probe feeding.
Highlights
Many recent books and articles have discussed the use of reconfigurable antennas for “green”
The results demonstrate circular polarization at broadside and in the most important directions and simulated results, circular polarization was observed in each switching state, and in the E and H
The proposed antenna is reconfigurable for both RHCP and LHCP, by adjusting the DC biasing of two PIN diodes
Summary
Many recent books and articles have discussed the use of reconfigurable antennas for “green”flexible RF in 5G applications [1,2,3]. Polarization reconfigurable antennas can help to provide protection from interfering signals in variable environments, offering a further degree of freedom to increase link quality in the form of altered antenna characteristics. They may be used in active tracking, labeling, read and write applications, and to enhance channel capacity [10]. Several antennas have been developed to deliver reconfigurable polarization using switches. Su et al proposed and fabricated polarization-reconfigurable circularly polarizing antennas for GPS systems using four photoconductive diodes [11]. Polarization, determined by the state of each diode, can be switched from linear to circular, through either left-hand or right-hand circular polarization (LHCP and RHCP, respectively)
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