Circular Polarization Reconfigurable Antenna Based on Defect Ground Structure for Mid-Band 5G Applications

Design and analysis of frequency reconfigurable antenna for global positioning system applications

“…The reconfigurable antennas recently have been received great attention in wireless communication systems by researchers due to their capabilities for maintaining various functionalities of multiple frequencies, multiple patterns, and multiple polarizations re-configurability. In addition the reconfigurable antennas are used to reduce the number of antennas through utilizing single reconfigurable antenna instead of multiple multi-band antenna with better characteristics [4], [5]. In another hand, the reconfigurable antenna has the ability to reduce the filter requirement at the front-end system by providing the interference signals rejection for the unused bands [6].…”

“…There are a lot of reconfigurable antennas proposed to operate with different wireless communication systems such as in [4], a circular disc-shaped reconfigurable antenna with beam steering the radiation pattern for GPS applications using three PIN diode. For mobile applications, a foldable reconfigurable indoor loop antenna is designed which can operate in the heptad range, including GPS, global system for mobile (GSM850), GSM900, PCS, digital cellular system (DCS), WLAN, and universal mobile telecommunications system (UMTS) with return loss less than 6 dBm [7].…”