A New Ultracompact Narrow Bandpass Microstrip Filter Using Double-Negative Quasiplanar Cells

Abstract EN

This paper presents a novel ultracompact narrow bandpass filter with high selectivity.

The proposed filter is composed of cascading two basic cells.

Each cell is basically a microstrip line loaded with a quasiplanar resonator and series gaps which can be fabricated using a standard multilayer printed circuit board technology.

The structure is analyzed through an equivalent circuit and full-wave simulations.

The simulation results are compared with experimental measurements demonstrating a good agreement between them.

The measurement indicates that the realized bandpass filter at the center frequency of 1 GHz has a fractional bandwidth of 2.2%.

Most importantly, in comparison with other similar recent works, it is shown that the proposed filter has the smallest size.