An Ultrawideband Circularly-Polarized Vivaldi Antenna With High Gain

An Ultrawideband Circularly-Polarized Vivaldi Antenna With High Gain

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This paper proposes a novel ultrawideband antenna with high gain and circular polarization.Its circular polarization can be easily changed to right-handed or left-handed.The antenna consists of four sophisticated antipodal Vivaldi antennas and an ultrawideband feeding network.The feeding network composes of four horizontal-to-vertical transitions, a two-to-four power divider, and a 3-dB directional coupler.

This network can provide two pairs of outputs with equal magnitude and ninety-degree phase difference.In addition, it is horizontally fed with a Medical and Utility Carts single input port that can be directly connected to the corresponding circuit board.The newly introduced transition can reduce the discontinuity between the horizontally placed circuit and vertically standing antenna.A prototype antenna is designed, fabricated, and tested.

Its impedance-matching, circularly-polarized and stable-gain band is sufficiently wide to cover the entire Ku, K, and Ka bands.The fractional bandwidth (FBW) is as large as 113.2%.In the Dining Table entire band, the antenna axial ratio is well below 3 dB, while the antenna gain is stable up to 18.

35 dBic.Remarkable performance has been achieved in the literature for the first time.