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Some novel bandstop filters (BSF's) are proposed,including a sharp-rejection BSF via the combination of the conventional BSF and signal interference technique, a sharp-rejection dual-band BSF using signal-interaction concept with three paths. The measurement results have a good agreement with the simulation results.
A novel planar dual-band monopole antenna with circular polarization (CP) operation is proposed. By appropriately introducing an inverted L-shaped strip-sleeve shorted at the ground plane, the proposed dual-band CP design can easily be achieved with the impedance bandwidth (RL ≧10 dB) of about 1932 / 339 MHz and the 3 dB axial-ratio (AR) bandwidth of about 250 / 360 MHz for 2.4 / 5.2 GHz wireless...
A microstrip-line dual-band bandpass filter using stub-loaded resonator (SLR) with good selectivity in first pass band and wide bandwidth in second pass band is proposed in this paper. By properly adjusting the gap between source-load and SLR, good return loss at lower frequencies can be achieved. To further improve the rejection level between the first pass band and second pass band, the spur-line...
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