A polarization reconfigurable CPW fed monopole antenna with L-shaped parasitic element

Abstract

A coplanar waveguide fed polarization reconfigurable monopole antenna is proposed in this letter. The proposed antenna consists of L‐shaped stubs placed on either side of a monopole, two p‐i‐n diodes and a slot in the ground plane. In the proposed antenna structure, the switching element is not directly connected to the feed line. Depending on the switching state of the p‐i‐n diodes, the antenna either radiates left/right circular polarization or linear polarization. To validate the proposed design, the antenna was fabricated and its performance was measured. Since the ground plane is electrically small, the effect of the cable and SMA connector on the performance of the antenna is also investigated. The measured impedance bandwidth is 66.78% (3.67 GHz to 7.35 GHz) and the axial ratio bandwidth is 13.62% (4.24‐4.86 GHz) for circular polarization and 23.61% (3.81‐4.83 GHz) impedance bandwidth for linear polarization.

A Frequency and Polarization Agile Disc Monopole Wearable Antenna for Medical Applications

“…A frequency reconfig-urable antenna for bluetooth, WiMAX, and WLAN applications has been proposed in [5] that can adjust its operating band according to the requirement. Polarization reconfigurability also has been reported in [6][7][8][9][10]. By using PIN diodes on the inset of the etched "U" shaped slot line on the patch antenna [6], switching between the polarization states has been achieved.…”

“…By using PIN diodes on the inset of the etched "U" shaped slot line on the patch antenna [6], switching between the polarization states has been achieved. The ground plane of the coplanar waveguide fed monopole antenna as proposed in [7] has been modified by introducing an L-shaped stub on the either side of the monopole along with PIN diode to achieve polarization reconfigurability. Using the technique of loading a pair of identical meandering perturbation slots symmetrically below the conventional annular ring slot antenna [8], polarization agility has been realized.…”

“…The frequency ratios of the two modes are adjusted by inserting four shorting posts into the patch. The works proposed in [5][6][7][8][9][10][11] are either frequency reconfigurable or polarization reconfigurable. However, the design [1] represents a combined frequency and polarization reconfigurable antenna where initially, three different polarization states are achieved utilizing different combination of the PIN diodes.…”

Design optimization of a pattern reconfigurable microstrip antenna using differential evolution and 3D EM simulation‐based neural network model

“…The design complexity of reconfigurable pattern antennae are relatively high; however, there had been many studies that provides solutions for this challenging design problem such as usage of mechanical gears, modification of feeding systems phase, and modifications of surface currents via use of switches …”

“…[7][8][9][10][11][12][13][14][15][16][17][18][19][20] The design complexity of reconfigurable pattern antennae are relatively high; however, there had been many studies that provides solutions for this challenging design problem such as usage of mechanical gears, 21 modification of feeding systems phase, 22 and modifications of surface currents via use of switches. [23][24][25][26][27][28][29] One of the commonly used methods for design of reconfigurable pattern antenna is integration of PIN diodes on the surface of the antenna design. Microstrip antenna are optimal design due to their low cost, low profile, conformal ability, and easiness to be integrated with PIN diodes or RF-MEMS switches.…”