A NEW ELLIPTIC FUNCTION BAND-PASS FILTER WITH ADJUSTABLE SIZE USING μ-NEAR ZERO METAMATERIAL RESONATORS

摘要

In this article, a new compact narrow bandwidth elliptic function band-pass filter (BPF) using combination of stepped impedance resonator shaped hair-pin, interdigital capacitor, and meander-line resonator with μ-near zero (MNZ) metamaterial is studied. The MNZ metamaterial resonator has band-stop resonance and positive phase response (+90°) due to its zero-value permeability. The experimental result of the resonator shows the loaded quality factor (Q_L) of 244 at the resonant frequency of 9.95 GHz. Also, the insertion and return losses of the proposed BPF are 1.55 and 15.4 dB with bandwidth of 2.5% and center frequency of 9.95 GHz, respectively. The size of the proposed BPF is 3.56 × 4.47 mm~2.