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Abstract
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A miniaturized wideband band-pass filter with a 3-dB fractional bandwidth of
109.3% (1.53 GHz to 5.22 GHz), high out-of-band attenuation greater than
25 dB, and wide upper stopband up to 14 GHz is proposed. The design consists
of a dual-composite right/left handed resonator, embedded open-circuited
stub, and a pair of quarter-wavelength short-circuited stubs. These elements
are coupled in the near distance to form a miniature filter with a compact
occupied area of 0.21 λg* 0.19 λg (≈ 0.013 cm2). The optimized filter has multi transmission
poles in the passband, substantially improving the return loss
and insertion loss characteristics. The behavior of the passband and stopband
is verified against the results of a lumped element model and matrix analysis
with a full-wave moment-based analysis and actual measurements. The results
of this verification and a comparison with the performance of filters in other
references indicate that the proposed filter is very efficient and applicable to
compact microwave systems.
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