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A novel planar end-fire circularly polarized (CP) complementary antenna is presented. It consists of an aperture element as the magnetic dipole and a printed dipole element as the electric dipole. Due to the combination of the vertically polarized component from a magnetic dipole and the horizontally polarized component from a printed dipole on the same substrate, a planar CP antenna with end-fire...
In this paper, a compact quasi-Yagi antenna with ultra-wideband balun filter is presented. The proposed balun filter is constructed with composite microstrip and slotline resonators. With the excited three resonant modes of slotline resonator and two additional resonant modes of microstrip lines, the balun filter with ultra-wideband response can be realized. Thus, with this proposed ultra-wideband...
A compact wideband planar quasi-Yagi antenna is proposed. The antenna consists of a symmetrical dipole connecting with two microstrip elements and can be directly integrated with differential circuits. The return loss, radiation pattern and gain over the whole operational frequency band have been analyzed. The operation principle is also discussed. It is shown that the impedance bandwidth of the antenna...
In this paper, a tunable microstrip antenna-filter is proposed based on a double U-shaped defected ground structure (DGS) and compact tunable square-loop dual-mode bandpass filter using capacitively loaded resonator. The antenna structure consists of a simple trapezoid monopole with a DGS microstrip feedline for excitation and this also yields a broaden impedance bandwidth covering 0.8 GHz to 2 GHz...
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