Novel design of reconfigurable microstrip slot antenna with switchable band-notched characteristic

In this article, a kind of reconfigurable slot antenna with multiresonance and switchable band-notched functions is designed and manufactured whose frequency characteristics can be reconfigured electronically to has a band-notched function to block interfering signals 5–6 GHz wireless local area network (WLAN). In the proposed design, by using a pair of protruded arrow-shaped strips inside an extra rectangular slot in the ground plane, additional resonance is excited and hence much wider impedance bandwidth can be produced, especially at the higher band which provides a wide usable fractional bandwidth of more than 135%. Using these modified structures, the usable upper frequency of the antenna is extended from 8.6 to 13.7 GHz. To generate a reconfigurable band-stop performance, we use a PIN diode within the inserted triangular-shaped slot in the modified radiating stub. By changing the ON/OFF conditions of the PIN diode, the antenna can be used to generate a switchable band-notched characteristic. It will help to minimize the interference between the UWB and WLAN systems and whenever there is no coexistence system, the structure of the antenna can be transformed in a way that leads to a whole coverage of UWB spectrum. The antenna exhibits good radiation behavior within the UWB frequency range. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:849–853, 2015