Design of an antipodal Vivaldi antenna with fractal‐shaped dielectric slab for enhanced radiation characteristics

Abstract

A conventional antipodal Vivaldi antenna (CAVA) with fractal‐based parallel dielectric slabs is proposed for different wideband applications. At first, a CAVA is designed as a reference antenna, and then Koch fractal‐shaped dielectric slabs are placed parallel to CAVA. The presence of fractal‐shaped dielectric slabs increases the operating bandwidth, and also the field coupling between the antenna arms enhances the gain and directivity of the antenna. The optimized structure of the antenna produces |S11| < −10 dB frequency band from 4.2 GHz to 50 GHz. The total dimension of the fabricated prototype of the proposed antenna is 122 × 66 × 7.692 mm3.

Resistance‐loaded miniaturized dual‐layer Vivaldi antenna for plasma reflection diagnosis

“…In addition, other forms of Vivaldi antennas are listed in Table 1 and compared to the proposed antenna. Each antenna has its own unique characteristics, and the proposed antenna is much more compact than those in References 7‐9,13. Also, compared with References 7,10‐12, the proposed antenna has a wider impedance bandwidth.…”

“…Various miniaturization techniques have been employed to reduce antenna size without degrading impedance and pattern performance. [8][9][10][11][12][13] In Reference 14, a printed Vivaldi antenna using stepped connected structure between tapered patches and slotline has a wide bandwidth from 3 to 15.1 GHz. An antipodal Vivaldi antenna with corrugated-typestructure has obtained a wider impedance bandwidth and higher gain, and is used in microwave imaging.…”

“…Reducing the size severely affects the impedance characteristics of the low frequency and also degrades the pattern performance of the entire frequency band. Various miniaturization techniques have been employed to reduce antenna size without degrading impedance and pattern performance 8‐13 …”

Dielectric loaded directive Vivaldi antenna considering dispersion in near and far field

“…[23][24][25][26][27] On the other hand, the use of metamaterial, periodic structures ultimately introduce the conductor loss and reduces radiation efficiency. 5,[28][29][30][31][32][33][34][35][36][37][38][39][40] Although the antenna radiation characteristics are reported in the above discussed work, time domain characterization is not discussed for the above cases which is very much important for investigating the radiation performance and quality of signal in the near and far field, without this the characterization of Vivaldi antenna remain incomplete. The time domain characterization of the Vivaldi antenna is essential because the pulse spreading, ringing effect degrades the signal to noise ratio and beat error rate in UWB systems.…”

Metamaterial Loaded Nine High Gain Vivaldi Antennas Array for Microwave Breast Imaging Application

“…The medical imaging applications require the antenna with high gain, a directive in nature, and higher efficiency. Several antennas are proposed by researchers for MIS such as tapered slotted antenna (TSA), unit cell antenna, cross Vivaldi antenna, metamaterials antenna, three-dimensional slot-loaded antenna, side slotted Vivaldi antenna [12][13][14][15][16][17][18] and antipodal Vivaldi antennas [19,20].…”