A novel miniaturized antipodal Vivaldi antenna with high gain

Abstract

A novel antipodal Vivaldi antenna operating at an ultra‐wideband of 5.2 to 40 GHz with high gain and miniaturized size is presented in this article. By introducing a pair of radiation arms with maple‐leaf edge shape, the antenna gain is increased by 1 to 3 dB over the upper operation band (10‐40 GHz) compared to the normal antipodal Vivaldi antenna (AVA). To remain the beamwidth while increasing the gain, two rows of specialized symmetrical metallized vias are loaded on the two inside edges of the exponentially slot. By loading the resistors between the top and the bottom planes, the side lobe level at E‐plane is reduced by 3 dB. This proposed maple‐leaf antipodal Vivaldi antenna (MAVA) has the miniaturization size of 0.66λg × 0.68λg × 0.003λg. According to the simulated results, the relative bandwidth of the reflection coefficient less than −10 dB is 154%, and the gain is higher than 10 dBi over the 22 to 40 GHz band with the maximum value of 14.3 dBi. The antenna design is validated by the measurements.

High‐gain UWB double slot vivaldi antenna loaded with metasurface and semi‐elliptical slots

“…In, 9 the exponential slot edge can improve the radiation pattern without increasing the size of the antenna. Similar slotted edge designs can be found in works 10–13 . In addition, different types of metamaterial structures have been integrated with Vivaldi antennas to improve the radiation performance.…”

“…Similar slotted edge designs can be found in works. [10][11][12][13] In addition, different types of metamaterial structures have been integrated with Vivaldi antennas to improve the radiation performance. For example, an antipodal tapered slot antenna is loaded with a zero-index metamaterial (ZIM) structure in.…”

Vivaldi antennas: a historical review and current state of art

“…A highly directed Vivaldi antenna structure is obtained in [16] where the radiator is fed by a tapered microstrip line and slot line for impedance transformation from 50 Ω to about 80 Ω. In [17], a microstrip line to a symmetric double-sided slot line formation is used, which makes the input impedance conveniently matched to 50 Ω within a broadband. In [18], the design of a three-port diversity antenna capable of producing three-directional radiation pattern for vehicular communications is presented.…”

“…Here to restrict the field radiation and concentrate the energy in the end-fire direction, coupling patches are introduced in the aperture area of the antenna. In [17], a Vivaldi antenna is presented where the gain of the antenna is enhanced by adding a via-loaded maple leaf shape on the edge of the radiator and ground plane. These maple leaves increase the gain at the upper-frequency band.…”

Design and Development of a Wideband Planar Yagi Antenna Using Tightly Coupled Directive Element

“…Commonly used broadband microstrip antennas include antipodal and slot-coupled Vivaldi antennas; log-periodic arrays; feedline-coupled, multilayer-stacked patch antennas; and quasi-Yagi antennas [11][12][13][14][15][16]. Generally, Vivaldi and log-periodic array antennas are capable of operating over an ultra-broad bandwidth, but they may not be suitable for some applications where signal bandwidth is smaller.…”