A dual wideband bandpass filter for WLAN and 5G Wi-Fi applications

Abstract

A two order dual-band bandpass filter using a half-wavelength step impedance resonator to operate at the passbands 2.45 GHz and 5.45 GHz is proposed. Ground slots were embedded below the coupled line section to increase coupling that resulted in passbands of 560 MHz and 470 MHz. Four transmission zeroes obtained at 1.75 GHz, 3.79 GHz, 6.23 GHz and 9.34 GHz, near the two passband edges enhanced the filter selectivity. The detailed design process is presented.