Abstract
This paper proposes a coplanar waveguide (CPW)-fed semiloop antenna with switchable linear polarization and radiation pattern. This design uses a novel asymmetric coplanar strip line (ACPS) circular ring to produce even or odd modes of the CPW, which can generate vertical or horizontal polarization in the semiloop antenna. The modes of the ACPS circular ring can be switched by controlling the on/off state of the PIN diode, and only a two-bit control signal is required to select the operating mode. The proposed polarization switchable antenna uses only one metal layer of the printed circuit board. The center frequency of the dual-polarization antenna was determined to be 2.45 GHz, and the −10 dB impedance bandwidths were determined to be 12.86% and 4.92% for vertical and horizontal polarization, respectively. The antenna parameters, such as the return loss, gain, and radiation patterns, are also presented for validating the proposed design.
Highlights
With the rapid progress in multimedia technology, media with considerably high resolution are required to be transmitted through wireless communication systems
MIMO systems with reconfigurable antenna elements can increase the capacity of wireless communication systems [3,4]
If the coplanar waveguide (CPW) is in the odd mode and fed to the semiloop antenna, the currents on the two short sides of the rectangular semiloop antenna are in opposite directions, whereas the currents are in the same direction on the long side
Summary
With the rapid progress in multimedia technology, media with considerably high resolution are required to be transmitted through wireless communication systems. The antenna design proposed by Chen et al [26] proposed four linear polarizations, and the designs proposed by Chang et al [28] and Nguyen-Trong et al [29] provides up to six linear polarizations Most of these linear polarized reconfigurable antennas have large diode-switched radiating elements and require a probe feed in their center to achieve structural symmetry for generating a pair of linear polarized waves. A novel asymmetric coplanar strip line (ACPS) ring structure is proposed to switch modes on CPW This design has one CPW feed port, whose polarization state can be electrically switched between vertical and horizontal polarization through a 2-bit control signal.
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