CPW-Fed Small Slot Antenna With Reconfigurable Circular Polarizion and Impdeance Bandwidth Characteristcis for DCS/Wimax Applications

Abstract

Abstract-A novel printed reconfigurable square slot antenna with switchable right/left-handed circular-polarization (CP) and switchable dual-band performances for use in DCS/WiMAX applications is designed and manufactured. In the proposed antenna, in order to create a reconfigurable structure with switchable dual-band performance, a meander-line shaped radiating stub is utilized. This radiating stub can select between two operating frequency bands with respect to the number of its steps, and also right-or left-handed circular polarization at one of the operating bands (WiMAX) is determined by the growth direction of this meander-line structure. Moreover, through embedding an L-shaped slot on the ground section, circular polarization can be provided for the other operating frequency band (DCS). Having right-or left-handed circular polarization at this frequency band can be determined by the location and orientation of the L-shaped slot on the ground plane. In order to achieve a reconfigurable antenna structure with simultaneous switchable dual-band and circular polarization functions, six PIN diodes were utilized. The designed antenna has a small size of 30 × 30 mm. Simulated and experimental results obtained for the designed antenna reveal good radiation behavior within the DCS (1.85 GHz) and WiMAX (3.5 GHz) frequency ranges.

Reconfigurable Antennas: Switching Techniques—A Survey

“…In addition, manipulation of patterns is useful in avoiding noise sources, mitigating electronic jamming, improving security and increasing energy efficiency. The polarization reconfigurable antennas can switch the polarization characteristics of the radiators between various linear polarizations, right-hand circular polarization (RHCP), left-hand circular polarization (LHCP) and any number of elliptical polarizations [11][12][13].…”

CPW-Fed Reconfigurable Clover-Shaped Antenna With Switchable Circular Polarization

“…The vertical and horizontal linear polarizations were obtained by changing the bias state of the two p-i-n diodes. Circular polarization diversity were realized in [14,15]. In [14], by changing the bias states of the two PIN-diode embedded in the inverted-L-shape ground strips at the upper corner of square slots, RHCP and LHCP characteristics can be fulfilled.…”

“…In [14], by changing the bias states of the two PIN-diode embedded in the inverted-L-shape ground strips at the upper corner of square slots, RHCP and LHCP characteristics can be fulfilled. By inserting meander-line strip in the radiating stub and two L-shaped slots in the ground plane, a multi-band frequency performance and dual circular polarization characteristic can be realized [15]. The multi-band function was controlled by using four PIN diodes in the meander-line, while the circular polarization performance was determined by the bias states of the PIN diodes which were connected with the slots.…”

“…By electrically controlling the p-i-n diodes connected to the Y-shaped and T-shaped feeding line respectively, polarization reconfigurable antennas were obtained. CPW-fed planar antennas were widely used in reconfigurable antenna designs due to their simple structure [13][14][15]. In [13], a polarization reconfigurable CPW-fed slot antenna was proposed.…”

“…Many researches of polarization switchable antennas have been reported [3][4][5][6][7][8][9][10][11][12][13][14][15]. In general, the antennas with switchable polarization are designed to form at least two polarization states, like LHCP and RHCP, while the method to obtain polarization reconfigurability is mainly with the aid of switching devices such as RF MEMS or p-i-n diodes.…”