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In this paper, a novel wideband microstrip-fed quasi-Yagi antenna is presented. The proposed quasi-Yagi antenna consists of a microstrip-fed monopole, three radiating patches (two square patches and a rectangular patch), and three parasitic strip elements as the function of reflector. In order to achieve wide bandwidth, two parasitical patches are etched on both sides of the substrate. Furthermore, the stepped microstrip feeding line is adopted so as to get a good impedance matching. A fabricated prototype with the dimensions of 40 mm × 55.5 mm yields a directional far-field radiation pattern with no director, a −10 dB bandwidth (2.21-5.4 GHz) of 83.8% and a peak radiation gain of 4.17 dBi. Finally, the proposed antenna is analyzed, fabricated and measured. Measured and simulated results are in good agreement.

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In this paper, a compact dual-beam shorted-patch antenna is presented for wireless communications at 5.8 GHz. A short-end coplanar waveguide (CPW) feed line integrated on the ground plane is adopted in the structure to provide dual beam characteristic. The metal via array is applied in order to adjust the resonant frequency. The simulated results dual-beam radiation in the E-plane has maxima at +45°and 135°. The measured radiation pattern is dual-beam and the peak gain is 6.11 dBi at 5.8 GHz.

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