Design of Hybrid Fractal Integrated Half Mode SIW Band Pass Filter with CSRR and Minkowski Defected Ground Structure for Sub-6 GHz 5G Applications

Abstract

A compact and wide-stop band half mode substrate integrated waveguide (HMSIW) filter, incorporated with a hybrid fractal on the upper plane and a complementary split ring resonator (CSRR), along with a defected ground structure (DGS) etched on the bottom plane, is proposed for 5G sub-6 GHz application. A CSRR reduces the resonant frequency causing size miniaturisation by approximately 40% by augmenting the equivalent inductance and capacitance of the CSRR. Further, the low-pass characteristics of the DGS aid in suppressing out-of-band spurious harmonics. A two-pole band pass filter (BPF) is fabricated using FR4 (flame retardant) to validate the design. The results confirm that the proposed filter has a pass band from 3.75 GHz–5.12 GHz with spurious response below −20 dB > 4f0.

A Miniaturized, Dual-Port, Multiband MIMO with CSRR DGS for Internet of Things Using WLAN Communication Standards

“…Step 4 CSRR characteristics have been widely exploited by antenna designers to achieve various desired parameters. It has seen to be used in literature to achieve lower resonant frequencies in miniaturized antenna [26], to realize bandpass and bandstop filters [22,27], to enhance isolation in MIMO antenna systems, [28], and so on. The circuit models corresponding to CSRR are not very accurate because circuit modal of unit cell must take into account the coupling between the resonator and the line, i.e., interresonator coupling.…”