Wideband miniaturized antipodal Vivaldi antenna

Abstract

A wideband Vivaldi antenna with a miniaturized size is designed in this letter. The resistive loading, slot-loading, and coupling line at the radiation arms are introduced to miniaturize the antipodal Vivaldi antenna, as well as further reduce the lowest operating frequency. To verify the proposed design, a prototype with the size of 132 mm × 161 mm × 0.508 mm is fabricated. The measured results, which agree well with the simulations, show that an impedance bandwidth from 0.4 to 4 GHz with |S 11 | < −10 dB is realized, and the gain of the antenna varies between −7 and 7.5 dBi.

An improved gain and directivity design of an antipodal Vivaldi antenna for ultra‐wideband detection

“…Finally, Table 2 compares the performance of the proposed Vivaldi antenna with the Vivaldi antennas in other articles published in recent years. The proposed antenna achieves a larger bandwidth with comparable dimensions to de Oliveira et al 9 and Gao et al 34 and the slots designed in this paper does not significantly decrease the gain compared to 9 . Besides, although the antennas in Karmakar et al 23 and Ghosh et al 26 can also achieve large bandwidth and high gain, they are larger than that the proposed antenna, and their lenses are more complex compared to that in this paper.…”

“…A square parasitic patch with corrugations was loaded at the sides of the opening for a well-high-frequency directivity. 34 In Fu et al, 35 an I-shaped director was designed which also aims at improving the radiation at the high-frequency band. Another method to enhance directivity is by incorporating metamaterials, such as VA loaded with cross-shaped metamaterials, 36 VA loaded with artificial materials, 37 AVA loaded with high permittivity metamaterial unit cells, 38 AVA loaded with multiple phase compensation metamaterials, 39 VA with exponential spoof surface plasmon polaritons metamaterial, 40 and an AVA loaded with several small square metamaterial cells.…”

“…In Mao et al, 33 five sandglass‐shaped directors were introduced to improve the radiation characteristics. A square parasitic patch with corrugations was loaded at the sides of the opening for a well‐high‐frequency directivity 34 . In Fu et al, 35 an I‐shaped director was designed which also aims at improving the radiation at the high‐frequency band.…”

Ultrawideband 3‐D printed aperture‐shared conformal dual‐horn antenna

“…The conformal antenna can fit the shape of a platform, which is attractive for modern communication. Various types of conformal ultrawideband (UWB) antennas have been studied in the literature, including the Vivaldi antenna, 1 the transverse electromagnetic (TEM) horn antenna, 2,3 and the H‐plane horn antenna 4–10 …”