Polarization Reconfigurable Square Patch Antenna for Wireless Communications (original) (raw)
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A Comparative Study on Polarization Reconfigurable Circular Patch Antenna
Theory and Applications of Applied Electromagnetics, 2015
In this paper, an antenna with polarization reconfigurability is presented. The antenna consists of a two cross-slots diagonally positioned in the centre of a circular patch antenna. Two pair of switches are placed in the slots and by controlling the length of the slots, three different polarizations can be reconfigured. The proposed antenna is capable to reconfigure between linear polarization (LP), right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP). The linear polarization is achieved when the lengths of both slots are equal and the circular polarization type is obtained due to the inequality of the slot length. Details of the design and simulation results are discussed. This reconfigurable antenna with polarization diversity can be used for wireless local area network (WLAN) application.
TRIANGULAR SLOT CIRCULAR PATCH ANTENNA FOR CIRCULAR POLARIZATION RECONFIGURABILITY
IAEME PUBLICATION, 2013
This paper proposes a reconfigurable microstrip patch antenna with polarization states being switched between left hand circular polarization (LHCP) and right hand circular polarization (RHCP). The CP mode has been excited by perturbation element which is a triangular slot in the circular patch. Two PIN diodes are symmetrically placed on each side of triangular slot to alter the current direction around the patch, which determines the polarization state. By changing the state of the PIN diode, the antenna has been made to switch between twp states of circular polarization. This polarization reconfigurable patch antenna covers IEEE 802.11 outdoor band and has good agile polarization performance with nearly 48MHz CP bandwidth and minimum axial ratio near to 1dB. The minimum axial ratio frequency for LHCP and RHCP are same as 5.80GHz.
TRIANGULAR SLOT CIRCULAR PATCH ANTENNA FOR POLARIZATION RECONFIGURABILITY
IAEME PUBLICATION, 2013
This paper proposes a reconfigurable microstrip patch antenna with polarization states being switched between circular polarization (CP) and Linear polarization (LP). The CP mode has been excited by perturbation element which is a triangular slot inside a circular patch. A PIN diode has been placed on right side of the triangular slot to alter the current direction around the patch, which determines the polarization state. By changing the state of the PIN diode, the antenna has been made to switch between linearly polarized and circularly polarized mode. This polarization reconfigurable patch antenna covers IEEE 802.11 outdoor band and has good agile polarization performance with nearly 50MHz CP bandwidth and minimum axial ratio as 1.46dB. The minimum axial ratio frequency for CP and maximum axial ratio frequency for LP are nearly same at 5.767GHz and 5.775GHz respectively.
Design of Pin Loaded Reconfigurable Patch Antenna for Wireless Communications
The Applied Computational Electromagnetics Society, 2019
The design and performance analysis of a single fed reconfigurable patch antenna for circular polarization is presented. The patch has a square shaped slot etched on it. Four ultra-miniature diode switches are placed at appropriate positions to bridge the gap in the slot regions and are used to switch the nature of polarization between left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). The antenna achieves an impedance bandwidth (S11 ≤-10dB) between 2.34 GHz to 2.4 GHz (2.53%) with a center operating frequency of 2.37 GHz. The surface current distributions on the radiating patch along with its corresponding radiation patterns measured at the operating frequency are plotted. The antenna achieves an axial ratio beam width (AR ≤ 3dB) of-25 ⁰ to 50 ⁰ for left-hand circular polarization and-40 ⁰ to 45 ⁰ for right-hand circular polarization. Measured radiation pattern results show the antenna has a good cross-polarization isolation of-16.2 dB for RHCP configuration and-16.54 dB for LHCP configurations and hence the antenna is suitable for modern wireless applications.
Circular Ring Shaped Polarization Reconfigurable Antenna for Wireless Communications
Progress In Electromagnetics Research M
A single fed polarization reconfigurable antenna is presented. The antenna comprises of a circular ring-shaped radiating element along with reconfigurable feed network located at its center which eliminates the need for additional space for reconfigurable feed network. A separate biasing network is placed to bias the pin diodes in the feed network for polarization reconfiguration and achieves three polarization states (linear, left-hand and right-hand circularly polarization). The antenna is designed to operate at 2.4 GHz ISM band. The antenna parameters are simulated using Ansoft highfrequency structure simulator and are validated using Agilent network analyzer (N9925A) and antenna test systems. The antenna achieves a good −10 dB impedance bandwidth of 85 MHz (2.40-2.485) GHz in linear state and 85 MHz (2.41-2.495) GHz in the circularly polarization states along with better crosspolarization isolation (≥ 15 dB) in the operating bands and hence more suitable for modern wireless communications.
Design of a High Directive Gain Reconfigurable Circular Patch Antenna
A new probe-fed patch antenna polarization reconfiguration is presented in this proposed work. The antenna is composed of a circular radiating patch and a switchable feed network. By controlling the operating states of four pairs of pin diode in the feed network, the feed point of the circular patch can be switched. Therefore, a reconfiguration between four linear polarization directions at a 45 degree interval (22.5 degree, 67.5 degree, 112.5 degree and 157.5 degree) can be realized. All the different polarization states own similar matching and radiation characteristics. Simulated and measured results indicate that antenna can achieve reconfigurable quadri-polarization diversity features with an invariable operating frequency and excellent radiation performance, which are very attractive for wireless communications. In addition, the proposed design can offer more reconfigurable linear polarization directions by adding more switchable paths in the feed network.
IEEE Antennas and Propagation Magazine, 2015
This paper proposes a reconfigurable multiband extended U-slot antenna with polarization diversity for wireless applications. The antenna is able to switch among linear polarization (LP) and left-hand (LH) and right-hand (RH) circular polarizations (CPs) for 2.4-/5.8-GHz wireless local area network (WLAN) systems. The antenna is composed of an extended U-slot patch with modified ground plane and two p-i-n diodes to switch the slots at ON-and OFF-states. The p-i-n diodes are appropriately positioned to change the length of the slot arms, which alters the antenna's polarization with frequency diversity to operate in four states. The simulated and measured results verified the effectiveness of the proposed antenna configuration. The experimental bandwidths of the 10-dB return loss for RHCP and LHCP of 2.4-GHz WLAN are similar about 320 MHz (2.3-2.6 GHz), whereas for LP, the bandwidth is about 500 MHz (2.4-2.9 GHz). The bandwidths of the 3-dB axial ratio for the RHCP and LHCP states are about 400 MHz on the broadside direction for 2.4-GHz WLAN. The bandwidths for RHCP and LHCP of 5.8-GHz WLAN are about 500 MHz (5.6-6.1 GHz), whereas for LP, the bandwidth has two states about 300 MHz (5.7-6 GHz) and 600 MHz (5.3-5.9 GHz). This reconfigurable patch antenna with agile polarization and frequency diversity has good performance and concise structure, which can be also used for LP at 2.6-GHz Worldwide Interoperability for Microwave Access (WiMAX), digital multimedia broadcasting, 3.5-GHz WiMAX, C-band satellite (downlink), and HiperLAN/2 systems.
A Novel Reconfigurable Polarization Dual-band Patch Antenna for WLAN and WiMAX Systems
This paper presents a novel dual-band annular patch antenna with functional microstrip circuit module to reconfigure the polarized modes of the antenna. The proposed antenna consists of two bonded FR4 print circuit boards and is excited at WLAN band and WiMAX band by this functional circuit module. This module includes two branches of microstrip lines, two PIN diodes and a DC bias circuit. Two PIN diodes are placed on the two microstrip lines. The polarization of the antenna can be simply shifted back and forth between RHCP and LHCP by modifying the modes of PIN diode. Simulation and experimental results have shown a good bandwidth of axial ratio and antenna gain in circularly polarized states.
Reconfigurable single-feed antenna with switchable polarization
2013 21st Iranian Conference on Electrical Engineering (ICEE), 2013
A new reconfigurable single-feed circular microstrip antenna with polarization diversity is proposed. The simple structure of this antenna contains a radiating circular patch, four switches (PIN diode), and a 50 Ω microstrip feed line. It can be switched between four different states: two states for linear polarization (LP), one state for left hand circular polarization (LHCP) and one for right hand circular polarization (RHCP). Simulation and experimental results show that the proposed antenna demonstrates a good impedance bandwidth, and axial ratio in the circularly polarized states.
International Journal of Electrical and Computer Engineering (IJECE), 2023
This paper proposes a simple microstrip patch antenna (MPA) that can reconfigure its polarization states from linear to circular polarization in real-time by means of a PIN diode. An antenna is fed by a 50 Ω coaxial cable through the substrate of Teflon with relative permittivity of 2.15. The proposed antenna possesses a simple patch with a one-sided corner truncated to achieve polarization reconfigurability. A PIN diode is loaded to connect the main patch with a truncated corner and further maintain dual polarization states such as linear polarization (LP) and circular polarization (CP). Advanced design system (ADS) was used as a simulator to simulate the antenna, and a good understanding was obtained between simulated and measured results. Measured results showed a good agreement with simulated results at all working frequencies of interest. It shows minimum reflection coefficient gain with-10 dB scattering bandwidth 100 MHz for LP states and 170 MHz for CP states. It also shows an axial ratio of 1.56 dB for CP, and the cross-polarization level is also in a satisfying range.