Switchable Microstrip Bandpass-Stopband Filter Based on Periodically Loaded Transmission Lines

Abstract

This paper presents the design of a microstrip switchable band pass-stopband filter based on periodically loaded transmission lines. The proposed design, takes advantage of the structure symmetry of the left handed periodically loaded based filter and the extra degrees of freedom introduced by the metamaterial structure to switch between stop-band and bandpass behavior. It is shown that the relations between the device physical dimensions and the pass/rejection band bandwidth and central operating frequency, can be controlled through analytical expressions. As illustrative example, a switchable pass/stop band with the same bandwidth and central frequency is presented, showing a good agreement between measurement, simulation and theoretical predictions.

Metamaterial Impedance Matching Network for Ambient RF-Energy Harvesting Operating at 2.4 GHz and 5 GHz

“…The central frequency of the operating bands is determined by the stub length that determines the λ/2 resonant frequency. Initial values for L and C can be analytically evaluated from the structure dimensions using classical well known expressions [46].…”