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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 dual-polarized dielectric resonator antenna fed by bowtie-shaped slots is investigated, which exhibits high isolation of greater than about 40dB with a broad bandwidth of wider than 26%. Its measured maximum gain is 6.65dB with a gain variation of 1.25dB over the bandwidth. Its good polarization purity and broadside radiation patterns are also confirmed.
In this paper, the conical conformal antenna array is proposed, which employs a feeding network and three double feed square circularly polarization patches. Good agreement between the theoretical and experimental results is obtained. Its measured 3dB axial ratio bandwidth is about 270MHz, covering 1.37GHz–1.64GHz.The measured radiation pattern of antenna is also presented, which is almost onmidirectional.
By combing with the log-periodic and the linear-taper techniques, a broadband CPW-fed folded-slot antenna of 4-elements is presented. The design procedure of this broadband antenna having impedance bandwidth (VSWR < 2) up to 62.7% (4.56 - 8.73 GHz) is described, which offers a new means to enhance the impedance bandwidth of folded-slot antenna. The study on the key parameters and the simulated...
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