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In this paper, a compact dielectric rod antenna with relatively high gain is presented. A bifilar helix is employed as feeding structure to realize end-fire radiation and reduce the structure dimension. The effect of structure parameters on the radiation performance is studied, and an antenna operating at 8 GHz is designed as an example. Measured results demonstrate that the proposed antenna is much...
A cylindrical conformai microstrip Yagi antenna working around 10 GHz with endfire radiation and vertical polarization is proposed. The presented Yagi antenna has advantages of low profile, small size and high endfire gain. Each element of the Yagi antenna is a microstrip antenna (MSA) with one edge shorted, which can be regarded as a half MSA (HMSA). Furthermore, a cylindrical conformal Yagi array...
To broaden the beamwidth of microstrip antenna (MSA), a method of loading parasitic dipoles is proposed. Its equivalent analysis model has been proposed based on the cavity model. Numerical results reveal that the dipole can act as director or reflector according to its length and the distance between the patch and dipole. Then, the effect of parameters of a pair of parasitic dipoles on beamwidth...
In this paper, a VHF monopole antenna based on fractal structure is designed for marine rescue. The radiation characteristic of the antenna on sea level and ground is compared, and the influence of the antenna bend is discussed. Finally, a two-order fractal V-shaped monopole antenna working at 142 MHz is designed and fabricated as an example.
In this letter, a novel dual-band antenna covering 2.4/5.8 GHz Industrial Scientific Medical (ISM) bands is presented. At the lower band, a circular monopolar patch antenna with four symmetric slots is designed for omnidirectional radiation. At the upper band, a U-slot square patch antenna is designed for broadside radiation. By assembling the two antennas and feeding them with a common coaxial probe,...
Based on the high gain beam forming and overall spatial beam scanning properties of Luneburg lens, a phased monopole array mounted on the surface of a Luneburg lens is proposed. With controlled distributions of excitation amplitude and phase on four adjacent monopole elements, this monopole array can form continuously scanned beams instead of the conventional discrete beams. To demonstrate this feature,...
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