Abstract
A circularly-polarized-reconfigurable patch antenna based on fluidic control method is proposed in this paper. A liquid dielectric, ethyl acetate, is introduced to change the substrate of a patch antenna from homogeneous to inhomogeneous. Two orthogonal fundamental transverse magnetic (TM) modes are excited with a 90° phase difference in order to produce circularly polarized (CP) radiation. Then, the polarization of the proposed patch antenna is switchable between left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) through the injection of the liquid dielectric to different channels in the substrate. For demonstration, the proposed antenna is designed at 2.4 GHz for radio frequency identification (RFID) application. According to the measured result, the proposed circular-polarization-reconfigurable patch antenna has a stable circularly polarized (CP) gain of 8 dBic and an efficiency of 90 % across the effective frequency band. Additionally, the measured overlapped impedance bandwidth of two polarization state is from 2.24 to 2.52 GHz which can fully cover the measured overlapped 3-dB axial ratio (AR) bandwidth from 2.38 to 2.43 GHz.
Highlights
I N RECENT years, the application of polarization- reconfigurable antennas in satellite communications and radio frequency identification (RFID) increases significantly
The semiconductor reconfigurable method suffers from some drawbacks: i) they are not applicable to some high-power applications due to the power limitations of switches. ii) the additional power consumption of the direct current (DC) bias control network is significant because the DC power supply should be continuously provided to the working states. iii) the losses introduced by the semiconductor switches would affect the gain and total efficiency of the antenna
Some reconfigurable antenna designs with fluidic control method are reported
Summary
I N RECENT years, the application of polarization- reconfigurable antennas in satellite communications and RFID increases significantly. The dynamic feature of these liquid type reconfigurable antennas is inferior to that of the semiconductor switches, they can withstand higher power, work with smaller power consumption, and. A lowloss transformer oil is employed to change the dielectric constant of substrate for frequency reconfigurable design in [28] and two kinds of ionic liquids are introduced for passive beam-steering in [29]. The ethyl acetate, as a liquid dielectric, is used to make up DRA and realize CP reconfiguration [31] at high frequency band. The CP reconfiguration can be realized by dynamically changing the inhomogeneity of the substrate with fluidic control method. The proposed circular-polarization-reconfigurable (CPR) patch antenna has stable circularly polarized (CP) gain of 8 dBic and high total efficiency more than 90% across the effective frequency band.
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