Abstract
The miniaturized high-gain antenna is required in portable, ultra-wideband radar systems. However, the miniaturization, ultra-wideband and high gain often restrict each other in the antenna design. In this paper, a dual-polarized, double-slot, antipodal tapered slot antenna with a double-layer, dual-loop structure and novel slot edges is presented. The proposed magnetic dual-loop structure has the capacity to reduce the low cut-off frequency of the double-slot tapered slot antenna by weakening the resonance and coupling. In addition, the high gain, low sidelobe level (SLL), and low cross-polarization level are achieved in the boresight direction. A novel gradient slot profile is designed to improve the low-frequency directivity of the tapered slot antenna without affecting the matching. To feed the antenna elements, a kind of wideband, balun-divider structure is designed. The dual-polarized antenna is combined by two orthogonal elements in a cross configuration without galvanic contact or influence to performance. The measured results show that the impedance bandwidth of the proposed antenna is 0.6~4 GHz, and the maximum gain is 11 dBi. The isolation between the two antenna ports is better than 32 dB, and the cross-polarization discrimination (XPD) is better than 20 dB.
Highlights
Dual-polarized antennas have been increasingly in demand and deeply studied in ultra-wideband (UWB) systems, such as radar, wireless communication, and microwave imaging systems [1]
The conventional antipodal tapered slot antenna (TSA) (ATSAs) suffer from the skew of E-field that result in poor cross polarization and beam tilt [6]
It is worth mentioning that the antenna elements of dual-polarized TSAs in the literature usually have different characteristics, especially for another DP-double-slot antipodal tapered slot antenna (DSATSA), such as [18]
Summary
Dual-polarized antennas have been increasingly in demand and deeply studied in ultra-wideband (UWB) systems, such as radar, wireless communication, and microwave imaging systems [1]. As a kind of travelling-wave antennas, the tapered slot antenna (TSA) is widely used to form dual-polarized TSAs owing to its advantages of low cost and low weight [5]. It has disadvantages of lowest frequency limitation and radiation pattern distortion at high frequencies. For TSAs that are uniplanar or antipodal, single-slot or double-slot, orthogonal design without galvanic contact and polarization interference remains an important research field [14,15,16,17,18,19,20]
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