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In this paper we show that significant sidelobe reduction can be achieved in uniformly-fed arrays by combining space taper (ST), beamwidth taper (BT) and direction taper (DT). A uniformly-fed 4 rectangular microstrip element array is presented as an example. The beamwidth and the beam direction of the elements are controlled by adding parasitic elements above. It is shown that the obtained sidelobe...
In this paper we show that significant sidelobe reduction can be achieved in uniformly-fed arrays by combining space taper (ST), beamwidth taper (BT) and direction taper (DT). A uniformly-fed 4 U-shaped element array is presented as an example. The beamwidth of the elements is controlled by changing the space between its arms, and the beam direction of each element is controlled by using parasitic...
A wideband antenna having low cross-polarization level, based on a cavity slot element with a parasitic structure is proposed. The bandwidth of the antenna is 50% as demonstrated in the range 4.2 – 6.9 GHz (simulation) or 4.15 – 7.1 GHz (measurement). The cross-polarization level is −35 dB at the E-plane cut and −90 dB at the H-plane cut. The gain of the antenna is 6–7 dBi.
We present here two linear arrays mounted in the same aperture: the first array with 4 elements at 2.7 GHz (spacing 0.7λ) and the second array with 4 elements at 7.0 GHz (spacing 1.8λ). It is shown that by special design of the single high frequency element grating lobes are eliminated. The isolation between the two arrays is better than 14 dB.
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