Abstract
An X-band dual-polarized Vivaldi antenna with high isolation is proposed. The procedure of this antenna design includes the conventional Vivaldi antenna with regular slot edge (RSE), the dual-polarized Vivaldi antenna with two Vivaldi antennas which have different feeding point positions in a cross-shaped form, and the two Vivaldi antennas with a galvanic contact in soldering point. By applying the RSE, it reduced the dimensions of the Vivaldi antenna and improved its radiation performance. The modified antenna is fabricated and measured. The measured results show that S11<-10 dB at the entire X-band for the two Vivaldi antennas. The isolation (S21) between the two feeding ports, which has been improved by applying the different feeding point positions and the galvanic contact in soldering point, is better than 34 dB at X-band. In addition, the cross-polarized discrimination is better than 21 dB for the two Vivaldi antennas, and the measured results also include the gain of two Vivaldi antennas.
Highlights
The Vivaldi antenna was firstly described by Gibson in 1979 [1] and developed in an antipodal shape [2]
For conventional Vivaldi antennas, the study results show that the electric field vector of the Vivaldi antenna is parallel to the substrate, which is single-linear-polarized on its two major radiation planes
We used the different feeding point positions for two Vivaldi antennas instead of the one Vivaldi antenna being ahead of another Vivaldi antenna, and there is a galvanic contact in soldering point between the two Vivaldi antennas
Summary
The Vivaldi antenna was firstly described by Gibson in 1979 [1] and developed in an antipodal shape [2]. In [7,8,9,10,11], the dual-polarized Vivaldi antenna is composed of two conventional Vivaldi antennas in a cross-shaped form without galvanic contact, and the isolation (S21) between the two feeding ports is 23 dB in [9] and 25 dB in [7, 10]. The best result is presented in [12], the isolation is better than 30 dB at the entire function frequency band, and for the two Vivaldi antennas, one is ahead of the other, which avoids the antenna feeding lines overlapping each other. A modified dual-polarized Vivaldi antenna with good radiation performance and high isolation is designed and measured. For the two Vivaldi antennas, the measured gain is between 6.4 dB and 12.2 dB at X-band
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