Wideband Polarization Reconfigurable Differential Circularly Polarized Antenna

Abstract

This paper presents a polarization reconfigurable differential circularly polarized (PRDCP) antenna with wide impedance and axial ratio (AR) bandwidth for right-hand circular polarization (RHCP) or left-hand circular polarization (LHCP). The antenna is composed of a bandwidth-improved radiator and a reconfigurable differential-to-single-ended sequential feeding network. The radiator consists of three patches, and four feeding lines to achieve the wide AR bandwidth and stable radiation patterns. The feeding network consists of two stepped coupled line couplers (SCLCs), and two switches that provide switchable quadrature excitations. By digitally controlling the inputs of the switches, the LHCP or RHCP mode can be selected. To verify the feasibility of the PRDCP antenna, a prototype is designed, fabricated, and measured. The measured results show that the bandwidths in the LHCP (RHCP) are 75.6% (81.8%) of a 10-dB matching, 66.7% (71.2%) of a 3-dB AR with stable radiation patterns of 7.4 dBi (7.4 dBi) peak gain. INDEX TERMS Circularly polarized antenna, differential antenna, reconfigurable polarization, differentialto-single-ended feeding network.

A Jia-shaped artistic patch antenna for dual-band circular polarization

“…A modified stacked patch with dual band (1.62/2.49-GHz) and dual sense was proposed for BeiDou navigation systems [19], wherein a small antenna profile was accomplished. In [20], a dual-band CP reconfigurable antenna was proposed by using a novel dual-layer metasurface, whereas a wideband CP (3-dB axial ratio bandwidth of 70%) reconfigurable antenna was presented in [21]. However, these aforementioned dual band or wideband CP antennas were not the artistic antennas.…”

A low‐profile antenna with circularly polarized reconfigurable and omnidirectional radiation patterns

“…9 Due to its ability to generate both LHCP and RHCP radiation, many efforts have been made to realize polarization reconfigurable CP antennas and have generated many fruitful studies. [10][11][12][13][14][15][16] These CP reconfigurability facilitates the expansion of system capacity, suppression multipath effects, avoids polarization mismatch, increase anti-interference, simplify the structure, and reduce the cost of the system. In Reference, 10 a square patch was modified as the polarization reconfigurable CP antenna, which was fed by a Y-shaped network and achieves a bandwidth of 5.62%.…”

“…Reconfigurable antennas have attracted more and more attention and have been widely used in a variety of different wireless communication systems due to its many outstanding traits, which can provide such as variable frequencies, 1,2 patterns diversity, 3‐6 polarizations reconfiguration, 7,8 or an arbitrary combination of the former types 9 . Due to its ability to generate both LHCP and RHCP radiation, many efforts have been made to realize polarization reconfigurable CP antennas and have generated many fruitful studies 10‐16 . These CP reconfigurability facilitates the expansion of system capacity, suppression multipath effects, avoids polarization mismatch, increase anti‐interference, simplify the structure, and reduce the cost of the system.…”

“…Recently, the approach of reconfigurable feeding network has been proposed and integrated with antenna elements to improve the bandwidth of reconfigurable CP 11‐14 . A polarization reconfigurable differential CP was developed in Reference 15 with an impedance bandwidth of 66.7%. However, the majority of these antennas are designed to achieve only a broadside CP radiation and have a relatively high profile due to its complex multilayer structure.…”

A Compact Hollow Dual Circularly Polarized Antenna With Folded Coupled Feed Structure for Distance Detection Application

“…In [18], a loaded CP ring antenna for biomedical applications was designed, in which several slots and patches were added to the ring antenna for CP radiation. In [19], a polarization reconfigurable differential-fed CP ring antenna was simulated and measured. In [20], a combination of patch antenna and ring antenna was proposed to realize dual band operation.…”