London Met Repository

A Compact UWB-BPF based on Microstrip-to-CPW transition with multiple Transmission zeros

Lists

Tools

Ghazali, Abu Nasar, Sazid, Mohd and Virdee, Bal Singh (2018) A Compact UWB-BPF based on Microstrip-to-CPW transition with multiple Transmission zeros. Microwave and Optical Technology Letters, 60 (8). pp. 1925-1928.

[+][-]

Abstract

Proposed in this manuscript is a miniaturized Ultra-Wideband (UWB) bandpass filter (BPF) based on broadside coupled technology wherein microstrip and coplanar waveguide (CPW) are present on either side of the substrate. The ground plane of the proposed BPF contains a short-circuited multiple mode resonator (MMR) based CPW which is electromagnetically coupled through the dielectric to two open circuited microstrip lines on the top. The MMR is initially designed to allocate its first three resonant modes quasi-equally within the specified UWB spectrum. Later, the back-to-back arrangement of microstrip lines is optimized to generate a tightly coupled broadband response. This configuration generates an UWB response possessing insertion loss <0.26 dB in simulation, two transmission zeros at the lower and upper passband edges that improve selectivity and a wide stopband with appreciable attenuation. The predicted theory is validated by testing the simulation result against the measured data of the fabricated prototype. The prototype measures only 14.6×9.2 mm2.

Documents