Annular-ring slot antenna designs with circular polarization radiation

The metamaterial elements and structures have been noticed for obtaining circular polarization (CP) while developing various procedures. In this paper, we have mentioned some of these cases and compared the metamaterial loads effect on antenna current distribution. We have classified them into four categories. The first case covers patch antenna based on composite right/left‐handed method, where the metamaterial has been used for changing the current distribution in the loop form. The second case has been achieved by radome and metasurface. In the third model, the interaction between feed and metamaterial load has been considered and the last case has been made by the metamaterial load with truncated structure. The metamaterial loading has been modeled based on Nicolson‐Ross or transmission/reflection techniques for extracting the permittivity and permeability. While the microstrip slot antennas are attractive for wider bandwidth, the truncated structure can change the current for achieving CP. Here, we have studied the antenna for wireless and WiMAX applications.

Section: Introductionmentioning

confidence: 99%

Metamaterial loads used in microstrip antenna for circular polarization: Review

Zarrabi

Pirooj

Pedram

2019

“…It is well known that circularly polarized (CP) radiation can mitigate the polarization mismatch, eliminate the Faraday rotation when signals travel through the ionosphere, and offer great flexibility in the orientation of a transmitter and a receiver. Consequently, owing to these features, CP antennas have been widely employed for many applications in satellite communication, global positioning and navigation system, radio frequency identification systems (RFID), and wireless local area networks …”

Section: Introductionmentioning

confidence: 99%

Novel wide-beam cross-dipole CP antenna for GNSS applications

Zhang

Qin

et al. 2018

A wide‐beam circularly polarized (CP) cross‐dipole antenna for GNSS applications is proposed in this article. This cross‐dipole antenna is fed by a coaxial cable, on which the slots is added to optimize the impedance matching. These two pairs of dipole arms are designed with different lengths to obtain the circularly polarized radiation. Enhanced wide‐beam CP radiation characteristics can be achieved by curving the dipole arms and adjusting the distance between the arms and the metallic ground plane. The study of proposed antenna performance with different geometric parameters has been conducted. The final antenna exhibits a good impedance bandwidth (IBW) of ∼13.1% (1.50‐1.71 GHz), and the 3‐dB axial‐ratio bandwidth is over 7% (1.52‐1.64 GHz). Broad pattern coverage of more than 140°, pure CP radiation at all designed bands and a wide 3 dB axial‐ratio beamwidth (ARBW) of nearly 150° makes this antenna an excellent candidate for satellite communications and navigation systems.

“…, which bandwidth has been enhanced. A novel technique of extending an inverted L‐shaped slot from the bottom section of the annular‐ring is proposed to obtain CP radiation with broad bandwidth . By properly combining the slot mode and extra resonance generated by the AMC surface, the metasurface‐based low‐profile crossed dipole antenna has achieved a wideband circularly polarized operation .…”

Section: Introductionmentioning

confidence: 99%

Novel single-fed broadband circularly polarized antenna for GNSS applications

Zhang

Qin

Wang

et al. 2017

This letter presents the design of a broadband microstrip CP antenna using single‐fed technique. The feeding network is integrated within the coupling feed patch to simplify the structure. The proposed antenna is designed for Global Navigation satellite System (GNSS) operating at 1575.42 ± 10.23 MHz (GPS: L1 band), 1559∼1592 MHz (Galileo: E2‐L1‐E1 band), 1602 ± 5.625 MHz (GLONASS: L1 band) and 1559.052∼1591.788 MHz & 1610∼1626.5 MHz (BeiDou Navigation Satellite System B1 and L band). Another advantage of this antenna is the much wider bandwidth in both VSWR and 3 dB axial‐ratio compared with traditional single‐fed CP antennas. Details of design, simulated and experimental results of this CP antenna are presented and discussed. The measured results confirm the validity of this design which meet the requirement of GNSS applications.