On Controlling the Passband and Stopband of UWB Band-Pass Filter

摘要

In this article, the passband, and stopband ofquarter wavelength stubs-based Band Pass Filter (BPF)are controlled by a straightforward and new method. Thismethod depends on inserting an attenuation pole andtuning the passband by a Circular Slot Ring Resonator(CSRR) and rectangular slot beneath the BPF’s stubs.Hence, controlling the passband width without any furtherarea usage is achieved. The stop-band rejection leveland bandwidth are controlled by inserting Band Stop Filter(BSF) after the BPF such that the used rectangularslots beneath the stubs control the stop-band bandwidth.For verification, third-order Chebyshev BPF and ButterworthBSF filters are used. The proposed filter passbandis chosen to cover the sub-6 GHz different 5G bands.The proposed BPF has an ultra-wide 3 dB passband of2.97 GHz (2.35 GHz - 5.32 GHz) and a 20 dB stopbandof 4.59 GHz (6.18-10.77 GHz). The proposed BPF filteris fabricated, measured, and the results are in goodagreement with their simulated counterparts.