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This paper presents a wideband circularly polarized (CP) antenna with high gain and end-fire radiation. The antenna consists of two metal strips on the same side of two substrates separated at a distance of 0.09λg, where λg is the guide wavelength at the lowest operating frequency. The two metal strips are shorted together at three edges. Two pairs of tapered stubs are protruded from the metal strips...
A broadband and wide-beamwidth dual circularly polarized (CP) antenna is presented in this paper. The antenna consists of two bent dipoles placed in a crossed shape. The dipoles are individually fed with signals with quadrature phases from a 3-dB hybrid coupler chip. A metal cavity serving as a reflector is used to produce a unidirectional radiation pattern. Measurements show that the antenna has...
A compact broadband dual-polarized patch antenna operating from 1.71 to 2.69 GHz for multi-functional services is presented. It has the total size of 100×100×22 mm3 (0.74λ0×0.74λ0×0.16λ0). Four fork-shaped probes are used to feed a square patch antenna to enhance the impedance bandwidth. A pair of broadband 180°-baluns designed using metamaterial transmission lines (MM TLs) is used in the feeding...
A microwave lens implemented using multi-layer substrates is proposed for antenna gain enhancement. The microwave lens proposed is composed of 11 layers of parallel substrates. A 3D-patch antenna designed to operate in the frequency band from 8 to 9 GHz (S11<−10 dB) is used for studying the microwave lens. Dual-feeding is used in the patch antenna to reduce cross polarization. For gain enhancement,...
A wideband circularly polarized (CP) antenna with a compact size of 0.64λ0×0.64λ0×0.27λ0 operating at the frequency of 2 GHz is presented. The antenna consists of a 4-way power divider, a patch antenna and a metasurface (MS). The input signal is fed to the 4-way power divider and the signals at the outputs of the 4-way power divider are coupled to a patch antenna using 4 orthogonally oriented L-shape...
In this paper, a wideband circularly polarized (CP) antenna array employing four monopoles is proposed. The feed network has a wideband 4-way power divider and is constructed using matermaterial transmission line (MM TL). The signals from adjacent output ports of the 4-way power divider have a phase difference of 90° and are used to feed the four monopole elements. Results show that the CP antenna...
A small metasurface (MS) lens is proposed to enhance the gain of antennas. The small MS lens has a circular shape with diameter 1λ, where λ is wavelength in free space. The unit cells on the MS lens has rectangular shapes and are designed according to the gradient index (GRIN) in the y-axis direction. The MS lens is placed at λ/2 from a source antenna. A slot and patch antennas are used for studies...
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