Vivaldi tapered slot verification#

The measured −10 dB impedance bandwidth and maximum gain were approximately 72.1% (0.47–1.00 GHz) and 2.57 dBi, respectively.

Vivaldi tapered slot verification#

For the experimental verification of the proposed antenna, it was fabricated on a flat circular printed circuit board (PCB) substrate with a radius of 0.25 λ0, where λ0 is the wavelength at 0.74 GHz (the center frequency of the operating band). A wideband impedance matching was achieved by inserting the slots between the flares and the feeding line. The proposed antenna consists of two radiation flares with straight slots and a feeding line.

This paper presents a wideband printed antipodal Vivaldi antenna using straight slots for UHF DVB-T/T2 applications covering a frequency range of 470–862 MHz. Singha Rahul and Vakula Damera, Directive beam of the monopole antenna using broadband gradient refractive index metamaterial for ultra-wideband application, IEEE Access, 5: 9757–9763, 2017.Department of Electronic Engineering, Gyeongsang National University (GNU), 501, Jinju-daero, Jinju, Gyeongnam, 52828, Republic of KoreaĪntipodal Vivaldi antenna, DVB-T/T2, straight slots, UHF applications, wideband Abstract

Bueno, and Henri Baudrand, A high directive Koch fractal Vivaldi antenna design for medical near-field microwave imaging applications, Microwave Opt. Justo, A palm tree antipodal Vivaldi antenna with exponential slot edge for improved radiation pattern, IEEE Antennas Wireless Propag. Nie, A printed Vivaldi Antenna with improved radiation patterns by using two pairs of Eye-Shaped Slots for UWB applications, Progress In Electromagnetics Research, 148: 63-71, 2014.Ī. Priou, Low-profile substrate-integrated lens antenna using metamaterials, IEEE Antennas Wireless Propag. Schüppert B., Microstrip/slot line transition: modelingand experimental investigation, IEEE Trans. Gazit, Improved design of the Vivaldi antenna, Inst. Kong, Robust method to retrieve the constitutive effective parameters of metamaterials, Phys. Cui, Experimental realization of a broadband bend structure using gradient index metamaterials, Opt. Shi, A broadband artificial material for gain enhancement of antipodal tapered slot antenna, IEEE Trans. Cui, Directivity enhancement to Vivaldi antennas using compactly anisotropic zeroindex metamaterials, IEEE Antennas Wirel. J., The Vivaldi Aerial, 9th European Microwave Conference, 101–105, 1979.ī. The peak gain is increased by 2.1 dB at 9.5 GHz. The radiation pattern of the antenna shows the beam width becomes narrow and directive with low side lobe level. The measurement results indicate that the reflection coefficient of the antenna is below -10 dB over the frequency band from 3 to 11 GHz. The GRIN metamaterial is integrated in front of the antenna which has the capability to manipulate electromagnetic wave accurately. Therefore, the proposed metamaterial is act as a regular lens in beam focusing. The metamaterial, whose effective refractive index is lower than that of the substrate on which the antenna is printed. Due to the non-resonant structure, the proposed unit cell exhibits low loss and large frequency bandwidth.

The gradient refractive index (GRIN) metamaterial is constructed by using non-resonant parallel-line unit cells with different refractive index.

The proposed metamaterial is capable of reducing the side lobe level of the antenna. A broadband gradient refractive index (GRIN) metamaterial is used to improve the gain of the tapered slot antenna.