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This paper presents a novel sequentially rotated patch array antenna with dual circular polarizations (CP). The present design has the advantages of compact size, simple feed networks, low cross polarization, and high isolation. The radiating elements are dual linearly polarized (LP) equilateral triangular patches with hybrid feeds. The vertical polarization (VP) of the patch antenna is obtained by...
This study presents the use of contiguous aperture radome as a method of generating circularly polarized signals from linear polarization antenna or antenna arrays which are covered by the structure. The experiment results of the novel structure with microstrip antenna are demonstrated for L-band operation. In addition, the structure is also built as a director which can greatly improve the directivity...
The design and implementation of a broadband single-layer low cost reflectarray is studied in this paper. The element in the reflectarray provides a nearly 360° linear phase range and have rebirth capability. The reflectarray is fed by a printed microstrip log-periodic dipole antenna. Using a sub-wavelength arrangement of element enables the reflectarray to achieve broadband characteristic. Then,...
A novel broadband single-layer reflectarray for satellite communications has been presented. The design and simulation results are obtained and discussed. The element in the reflectarray provides a nearly 360° linear phase range. The reflectarray is fed by a printed microstrip log-periodic dipole antenna. The broadband characteristic of the reflectarray is obtained due to the sub-wavelength of the...
A compact dual-polarized tapered slot antenna is proposed for ultra-wideband (UWB) through-wall imaging applications. The dual-polarized antenna is obtained by shifting one single-polarized element orthogonally into the other one. The miniaturization of the antenna is realized by employing a folded balun comprising a folded slot on the right side of the radiator and a stepped microstrip line is used...
In this paper, a novel wideband planar quasi-Yagi antenna with x-shaped elements is presented. Good impedance matching and mode transforming are realized by using an exponentialy tapered microstrip balun. This quasi-Yagi antenna is designed on FR-4 substrate whose dielectric constant is 4.4 and the thickness is 1.6 mm. Prototype antennas have been fabricated and measured. Experimental results show...
A broadband planar antenna has been embedded into singly and doubly curved surfaces. Cylindrical and spherical surfaces are considered for this conformal application. Comparative study is presented with parametric study. The parametric study includes the effect of thickness, extent of cut and radius. The results indicate that the impedance of the antenna is not sensitive to the radius; however the...
A simple ground plane structure that can reduce mutual coupling between closely-packed antenna elements is proposed. The structure consists of a dumb-bell-like pattern etched in a single ground plane. It is found that isolation of more than -40 dB can be achieved between two parallel individual planar inverted F antennas (PIFAs) sharing a common ground plane. Comparison of the proposed dumb-bell-like...
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