A new elliptic function band-pass filter with adjustable size using μ-near zero metamaterial resonators

ABSTRACT 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 (QL) 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 mm2. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2245–2248, 2014