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A novel 5.8 GHz band-notched wideband balanced bandpass filter (BPF) is proposed in this paper, which obtains favorable uniform differential-mode (DM) response and good common-mode suppression. The proposed differential-mode BPF is comprised of a four-stage branch-line structure with one pair of open-circuited stubs in the symmetrical plane. Two coupled SIRs are employed to generate one desired notched...
A novel microstrip circular disc monopole antenna with a reconfigurable 10-dB impedance bandwidth is proposed in this communication for cognitive radios (CRs). The antenna is fed by a microstrip line integrated with a bandpass filter based on a three-line coupled resonator (TLCR). The reconfiguration of the filter enables the monopole antenna to operate at either a wideband state or a narrowband state...
A novel microstrip monopole antenna with a reconfigurable −10 dB impedance bandwidth is proposed in this paper for cognitive radios. The antenna is fed by a microstrip line integrated with a stub coupled multiple-mode-resonator (MMR) filter. The reconfiguration of the filter makes the circular disc monopole antenna operate at either a wideband state from 3.8 to 6.9 GHz or a narrowband state by using...
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