Gap-Coupled Resonator Loaded Ultra-Wideband Filtenna for Frequency-Notching Applications

A fifth-order gap-coupled resonator loaded ultra-wide band (UWB) filtenna is proposed in this research article. The band-stop Butterworth filter is designed at the ISM frequency of 5.8 GHz and an ultra-wideband circular-shaped microstrip patch is integrated with the extended end of the filter. The filter is designed using the concept of the gap-coupled microstrip stub sections with a metallic via connected at the end. It yields all the necessary capacitive and inductive effects to show its band-stop property at the ISM band. It produces a sharp narrow--band notch at 5.8 GHz and helps the antenna to utilize all the available frequency bands by eliminating the possibility for the antenna to interfere with the 5.8 GHz ISM band.