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This paper proposes a high-gain mechanically reconfigurable antenna array based on a ring-shaped slotted-waveguide antenna for mm-wave applications. A full scanning range in the azimuthal plane is ensured by proper mechanically rotating a metallic jacket, which partially covers the array radiating structure. The technique provides a beamwidth of 37° in the azimuth plane and gain of 17.41 dBi at the...
This paper presents a wideband conical antenna incorporating a band-notched resonator. The notch band is created by using four U-shaped slots which are cut into the surface of the elliptical cone antenna. The notch band is located at 5 GHz. In comparison with previous work the main advantages of this contribution include 1) the simplicity with which the position of the notch band can be adjusted by...
This paper presents a square section pyramidal wideband monopole antenna incorporating four loop shaped slots. Each slot is loaded with varactor diodes to provide a tunable notch-band. The experiment shows that the antenna provides at least 10 dB of gain suppression in all horizontal directions in the vertical polarisation. It also yields omni-directional radiation patterns at frequencies throughout...
An ultra-wideband disk monopole antenna incorporating a band-notch function is presented. A narrowband slot antenna has also been integrated into the upper portion of the disk. The slot antenna is fed via a microstrip line, printed onto the reverse side of the substrate. A microstrip open-loop resonator (OLR) was used to generate a stop-band (or band-notch) within the return loss curve for the UWB...
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