Dual Band Circular Polarized Printed Dipole Antenna for S and C Band Wireless Applications

Abstract

In this article, a modified circular shape printed dipole structure is studied to achieve wide bandwidth and dual-band circular polarization (CP) behavior along with dual polarizations. The idea behind this structure is that asymmetric geometry can give rise to circular polarization with an optimized position of coaxial probe feed. The circular patches on both sides of the substrate are altered with elliptical slots at an optimized location in association with opening slots. With these alterations the impedance bandwidth for S 11 < −10 dB is ranging from 2.36-7.34 GHz (4.98 GHz) which is nearly 102.5% about mid-point frequency 4.85 GHz. The antenna resonates at a lower band (1.55 GHz) and shows linear polarization (LP) operation at that band whereas dual CP bands with dual senses are obtained at higher frequency ranges 4.00-4.60 GHz and 6.07-7.13 GHz respectively with 3-dB axial ratio bandwidth of 13.7% and 16.6%. The simulated and measured experimental results are in close agreement. This antenna is suitable to be used for navigation purposes, radar communication, and wireless communication (especially wireless avionics intra communications) in S and C bands, respectively.

Flexible Antenna with Circular/Linear Polarization for Wideband Biomedical Wireless Communication

“…To minimize the power required for communication within the nodes of the WBAN, the ultra-wideband (UWB) antennas are preferred to narrowband antennas for their low-power spectral density that is restricted to 41.3 dBm/MHz [8,9]. For this reason, the proposed G-shaped antenna is designed to operate in the "on-body" mode with linear polarization over the wide frequency band (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19). In this mode, the central antenna operates with linear polarization to communicate with the biosensor antennas for collecting biotelemetry data.…”

“…As shown in Figure 2, the WiMAX/WLAN antenna that may have arbitrary polarization (vertical or horizontal). To reduce the power loss caused by misalignment with the WiMAX/WLAN antenna, the G-shaped antenna is designed to produce circular polarization while operating in the "off-body" mode (5-6 GHz) and linear polarization while operating in the "on-body" mode (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19).…”

Dual-Band Millimeter-Wave Circularly Polarized Antenna for Mobile Communications

“…To keep the light weight and compact size of portable communication devices, a multipurpose antenna becomes a preferable choice for wireless communication systems. Multi-band circularly polarized printed antennas of compact size are required for many applications such as mobile handsets, satellites, radars, missiles, aircrafts, remote sensing and biomedical telemetry [1][2][3][4]. In a wireless communication system, if the transmitter and receiver have linearly polarized antennas, they must have the same orientation to ensure good reception.…”

“…Over the past few years, a lot of research papers have been concerned with multi-band circularly polarized printed antennas. In [1], dual-band operation is achieved by etching two elliptical slots in a wideband linearly polarized patch antenna and in the ground plane to act as band rejection element. Two gaps are etched on the circumference of the two slots to realize circular polarization.…”

Square Slot Antenna for Wide Circularly Polarized Bandwidth and Axial Ratio Beamwidth

“…Though the problem is the narrow beamwidth and bandwidth (axial ratio / impedance), which limit the utilisation of such existing antennas. To address the problem of constrained beamwidth, researchers of impedance bandwidth (IBW) and axial ratio bandwidth (ARBW) have proposed various kinds of slots, structures, and shapes [4]- [6].…”