Modelling and Analysis of Vivaldi Antenna Structure Design for Broadband Communication Systems (original) (raw)
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A Novel Method for Improving Antipodal Vivaldi Antenna Performance
IEEE Transactions on Antennas and Propagation, 2015
ABSTRACT Herein a new method for improving the directivity and bandwidth of the antipodal Vivaldi antenna structure is presented. The method is based on introducing a parasitic elliptical patch in the flare aperture to enhance the field coupling between the arms and produce stronger radiation in the endfire direction. This approach improves the directivity without compromising the low frequency performance and removes the need for electrically-thin dielectric substrates. The proposed antenna structure including the feeding line and transition measures 140 × 66 × 1.5 mm3 and has a peak gain > 0 dBi over the 2-32 GHz frequency range and > 10 dBi over the 6-21 GHz range, which is an improvement to what has been reported for Vivaldi antennas with similar size.
A Vivaldi Antenna with Improved Bandwidth and Gain
International journal of electrical and computer engineering systems, 2022
In this paper, the radiation characteristics of the conventional Vivaldi antenna are improved by proposing a novel design of a Vivaldi antenna. This proposed Vivaldi antenna is excited through three slots by using the L-probe microstrip feeder. The novel design can provide higher gain and wider bandwidth compared to that of the conventional Vivaldi antenna of the same size. The CST MWS software is used to simulate the proposed Vivaldi antenna. The measured and the simulated S-parameters were compared so that the feasibility of the proposed Vivaldi antenna was validated. The measured S-parameters show that the impedance bandwidth of the proposed Vivaldi antenna was from 1.976 to 7.728 GHz, while the measured maximum gain is 4.9 dBi at the operating frequency of 3 GHz.
IEEE Transactions on Antennas and Propagation, 2019
Novel methods of improving directivity and decreasing sidelobe radiation via the addition of an elliptical pseudoelement and irregularly-spaced notches in the tapered slot antenna are presented in this paper. This antenna has been shown to be functional over the C, X, Ku, K, Ka, and portions of the S and V bands covering 2.5-57 (22.8:1 bandwidth, defined where VSWR < 3) GHz. Minimum and maximum realized gains of 4 and 16 dB were achieved at 2.7 and 29.8 GHz, respectively. The antenna offers directive radiation patterns with a half-power beamwidth under 40° for frequencies above 6 GHz and under 30° for frequencies above 32 GHz. As compared to other Vivaldi antennas reported in the past, the proposed design offers a larger bandwidth while providing higher peak gain and average gain. Good agreement was observed between simulation and measurements.
Design and Performance Enhancement of Vivaldi Antenna
Research & Development in Material Science
In this paper, a computer aided design of Vivaldi Antenna is developed which is used to study the effect of different parameters such as rate of opening of exponential slot and size of the radius of circular slot of the Vivaldi Antenna. The proposed design resulted in enhancement of gain and reduction in reflection losses. COMSOL Multi physics simulator is used to design the proposed Vivaldi antenna.
Investigation of a New Idea for Antipodal Vivaldi Antenna Design
International Journal of Computer and Electrical Engineering, 2011
A novel method for improving the performance of Antipodal Vivaldi antenna is proposed and verified for its effectiveness. An Antipodal Vivaldi antenna is an UWB (Ultra Wide Band) antenna; however, its VSWR can be improved by employing a new procedure. Accordingly, a parasitic parameter is inserted in the structure in order to make the current distribution smoother. The reflection coefficient, radiation patterns and current distribution for both structures (the common and modified Antipodal Vivaldi antennas) are analyzed and compared, using full wave simulation tools.
A Miniaturized Antipodal Vivaldi Antenna With Improved Radiation Characteristics
IEEE Antennas and Wireless Propagation Letters, 2011
In this letter, a modified antipodal Vivaldi antenna is presented. A novel tapered slot edge (TSE) structure is employed in this design. The proposed TSE has the capacity to extend the low-end bandwidth limitation and improve the radiation characteristics in the lower frequencies. A prototype of the modified antenna is fabricated and experimentally studied as well. The measured results show reasonable agreement with the simulated ones that validate the design procedure and confirm the benefits of the modification. Index Terms-Antipodal Vivaldi antenna (AVA), tapered slot edge (TSE), wideband antenna. I. INTRODUCTION A S THE demand of compact, smart, and multifunctional antennas for modern communication in both military and civil applications increases, wideband antennas attract more and more interests in academic field recently. With a history of more than 30 years, the tapered slot antenna (TSA) is still one of the most widely used wideband antennas. The tapered slot antenna, as its name suggests, is a class of antenna with a tapered radiator profile. The first TSA was introduced by Gibson [1] with exponential profile, which is also known as the ETSA or Vivaldi antenna. Other forms, such as linear TSA, constant-width TSA, parabolic TSA Fermi TSA, logarithmically TSA, etc., are introduced afterward [2]-[6]. The dual exponentially tapered slot antenna (DETSA, or also known as the Bunny ear antenna), which supplies additional design degrees of freedom, is also presented in [7] and [8]. Compared to other wideband antennas, the TSAs have moderately high directivity, planer structure, low profile, and symmetric beam in both E-and H-plane. Also, it is inexpensive to fabricate and easy to integrate. All those characteristics make the TSA a good candidate for phased array, remote sensing, and short-rage communication. The TSA belongs to the class of endfire traveling wave antennas, which has theoretically infinite bandwidth. The conventional TSA usually applies slotline as radiation fins. In the practical situation, however, the operating bandwidth is limited. First, the high-end working band is restricted by the transmission structure between the microstrip to slotline. In the low-end Manuscript
Multiband Vivaldi Antenna for X and Ku band Applications
A Multiband vivaldi antenna is designed to operate in the X and Ku bands and simulational results are presented in this paper. Along with the ultrawide band, this particular vivaldi antenna is working in the range between 7 to 20 GHz at different resonent frequencies. Gain of more than 9dB and bandwidth enhancement of 0.92% can be achieved using this model. All the antenna parameters including design considerations and field distributions are presented in this paper.
International Journal of Antennas and Propagation
This paper presents a new miniaturized planar Vivaldi antenna (PVA) design. The proposed antenna structure consists of an aperture tapered profile and cavity stub fed with a simple 50 Ω strip line feeding network. The designed PVA offers versatile advantages, including the miniaturized size and simple design, and exhibited an outstanding performance compared to the latest reported literature. The antenna occupies a minimal space with an electrical size of 0.92λ0 × 0.64λ0 × 0.03λ0. The antenna achieves an excellent relative impedance bandwidth 117.25% at 10 dB return loss, peak realized gain of 10.9 dBi, and an excellent radiation efficiency of 95% at the specific resonances. The antenna’s optimal features, that is, broadband, high gain, and radiation efficiency, are achieved with efficient grooves based approach. Besides, the proposed antenna results are also analyzed in the time domain, which shows the excellent group delay performance <2 ns in the operational band. The proposed...