A compact antipodal Vivaldi antenna with metamaterial half-lens for beam control

Abstract

A compact antipodal Vivaldi antenna (AVA) with metamaterial half-lens (MHL) for beam control is proposed. The proposed AVA has three different beam forms in the operating frequency band, including end beam from 3 GHz to 9 GHz, beam splitting at 12.2 GHz, and 30 ∘ beam deflection at 13 GHz. Furthermore, it can perform 18 ∘ beam scanning by adjusting operating frequency from 12.7 GHz to 13.5 GHz. The simulation indicates that the proposed AVA has a −10 dB impedance bandwidth of 143.6% (2.3–14.0 GHz) and a −3 dB gain bandwidth of 100% (4.5–13.5 GHz), which is consistent with the experimental results. Besides, the gain of the proposed AVA has an improvement of about 2 dB in the working band. As a new method to control the beam, the loading of MHL realizes the design of a small size and multi-function antenna, which can be widely used in wireless communication systems.

A novel pattern reconfigurable dual beam Vivaldi antenna with water-based absorbers

“…The working mechanism of the proposed antenna is mainly the wavefront reconstruction function of ML and the electromagnetic wave absorption function of WBA [27]. We use the equivalent medium theory and the law of refraction of light to explain the working mechanism of ML.…”

Ultra-Wide Band Double-Slot Podal and Antipodal Vivaldi Antennas Feed by Compact Out-Of-Phase Power Divider Slot for Fluid Properties Determination

“…Different antenna designs are implemented for dielectric measurement systems such as crescent-shaped patch and slotted partial ground patch antenna [3,30], conventional microstrip patch antenna [21,26], EBG Based Microstrip Patch Antenna [15], microstrip rectangular patch with a grid pattern ground plane [28], SRR and CSRR-based microstrip sensor [31,32], and TEM horn antenna [33][34][35], depending on whether the application demands high gain, efficiency, and a consistent radiation pattern for improved sensitivity in the depiction of materials property. Several methods are proposed for achieving higher gain such as using dielectric [36] and metamaterial lenses [37], placing parasitic elliptical patch [38], electromagnetic bandgap (EBG) [39], adding profiled dielectric directors [40], applying negative index material (NIM) [41]. zero-index material (ZIM) [42], frequencyselective surface (FSS) [43], and dielectric slab [44].…”

Vivaldi Antenna Arrays Feed by Frequency-Independent Phase Shifter for High Directivity and Gain Used in Microwave Sensing and Communication Applications

“…However, the conventional Vivaldi antenna in an array undergoes some weaknesses, like slanting beam and changeable in directivity and gain at higher frequency [ 25 , 26 ]. To overcome these problems, several methods have been proposed for achieving higher gain by using methods like employing dielectric lens [ 26 ], metamaterial lens [ 27 , 28 ], parasitic elliptical patch [ 29 ], and electromagnetic bandgap (EBG) [ 30 ]. Other methods include use of profiled dielectric directors [ 31 , 32 ], modification of radiating arm slots [ 33 ], array structure [ 34 , 35 ], negative index material (NIM) [ 36 ], zero-index material (ZIM) [ 37 ] and dielectric slab [ 38 ].…”