Abstract
This paper presents a simple split ring resonator excitation to realize a multi-mode wideband bandpass filter in a rectangular waveguide cavity. The proposed resonator employs two rectangular split rings attached with two coaxial probes extended into the cavity to excite two resonant modes, unlike the conventional cavity resonators which employ conductive cylinders in the cavities to achieve the same results. A hybrid magnetic (HM) mode and a hybrid electric (HE) mode are the two hybrid modes excited to realize the wideband bandpass filter. The filter operates at 2.5 GHz center frequency with 53% fractional bandwidth. Finally, the prototypes of a second and a fourth order filter are fabricated for results validation. Measured results are in good agreement with the simulated ones.
Highlights
Microwave cavity filters are in vast demand in transceiver base stations of advanced wireless communication systems because of their low insertion loss and high power handling capability
The magnetic flux passing through the metallic loops induces currents in the loops and in result helps in exciting the resonant modes to realize the desired passband
Two split-ring resonators (SRR) connected with the two probes are used to excite the resonant modes in a rectangular waveguide cavity
Summary
Microwave cavity filters are in vast demand in transceiver base stations of advanced wireless communication systems because of their low insertion loss and high power handling capability. A variety of multi-mode filters comprising split-ring resonators (SRRs) [13], complementary split-ring resonators (CSRRs) [14], semi-complementary split ring resonators (SCSRRs) [15], square-shaped resonators [16], and stub-loaded dual mode resonators (SLDMRs) [17] have been reported using the substrate-integrated waveguide (SIW). These SIW based filters suffer from high insertion loss, low Q-factor, and low power handling capability. Measured and simulated results are in good agreement with each other
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