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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...
First, a method to obtain the equivalent circuit of a dipole consisting of frequency independent lumped elements is presented here. The input impedance of the equivalent circuit is in accordance with that of simulation results of the dipole. Then, based on the equivalent circuit of a single dipole, an equivalent circuit of one row periodic metal rod array is also developed. The passbands of periodic...
Based on the principles of constructing holographic antenna, the interference of the radiation fields of source antenna and the ideal plane wave is analyzed. Consequently, the positions of the holographic structure are determined. Furthermore the expressions of the positions of the holographic structure are achieved by simplifying the calculation of the minima of the interference fields. As examples,...
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