Planar dual-mode dual-band bandpass filter using a modified rectangular split-loop resonator loaded by an open-circuited stub

Abstract

A compact planar dual-band bandpass filter using a new microstrip dual-mode resonator has been proposed in this article, which is based on a modified rectangular split-loop resonator loaded by an open-circuited stub. The implemented filter with two passbands has shown an excellent performance, including three transmission zeros disturbed nearby the two passband edges and between the passbands, by which a high selectivity is obtained for the proposed filter. Also, the measured results agree well with the simulated ones.

Keywords:

• Dual-mode resonator
• dual-band bandpass filter
• modified rectangular split-loop resonator (MRSLR)
• multi-transmission zeros