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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.
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...
In this paper, a multi-layer power divider with a broadband behavior is presented. It has a compact size with an overall dimension of 30 mm × 35 mm. The proposed power divider operating at S-band adopts elliptical shape based on multilayer technology in order to achieve a broadband performance. The simulated results are compared with the measured data, and good agreement is reported. A resistor is...
A broadband microstrip-fed slot antenna is proposed for UHF applications. Its measured impedance bandwidth reaches 85.3% for VSWRles3, covering the frequency range from 390 MHz to 970 MHz. Backed by a cavity, the antenna achieves 5.5-7.5 dBi gain and has a compact structure, with the dimension of only 0.48lambda1 times 0.30lambda1 times 0.13lambda1 (lambda1 is the longest wavelength in the operating...
A novel microstrip slot antenna backed by a ground plane is presented, which has a measured VSWRles2 bandwidth of approximately 102%, and the measured gain of 5.5 dB to 7.8 dB over the entire bandwidth
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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