254 research outputs found

    Design and parametric evaluation of UWB antenna for array arrangement

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    This paper has introduced the concept of UWB antenna in array arrangements. The four elements of Balance Antipodal Vivaldi Antenna (BAVA) has been used for planar and H-plane array configuration in this research. Each single element of BAVA Antenna is printed on the glass-reinforced epoxy laminate material (FR4) along an overall thickness of 1.57mm and εr=4.3 respectively. The optimized measurement of each particular element is 60.75mm x 66mm approximatel. Further the parametric evaluation of four BAVA elements in different planes has been observed in this paper. The placement of array elements has almost coverd entire UWB frequency range and appropriate reflection coefficient which is better than -10dB has been established in both combinations. According to simulation results, the array elements in planar arrangement presenting a suitable reflection and works well at 3.2GHz frequency while the arrangement in H-plane the array elements works well at 7GHz of frequency. In planar arrangement, the operating frequency of antenna elements is shifting as results of the distance among inter elements which increase in wavelength. In H-plane arrangement an antenna elements generate additional gain up to 10.2 dB with good radiation patterns as compared to the planar plane. The CSTMWS simulation software has been used for antenna structural design and parametric verification

    UHF Antenna Design for AFIT Random Noise Radar

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    The design of a small ultra-high frequency (UHF) antenna for an ultra-wideband (UWB) random noise radar (RNR) system was undertaken to improve system bandwidth and reduce overall system size. The Vivaldi dipole antenna class showed the greatest potential for high performance in this specific application. After extensive computer simulation, three designs were built using two printed circuit board antenna construction methods. The antipodal chopped Vivaldi dipole antenna, built with a milling machine, achieved a wider bandwidth and more uniform spectral performance characteristics. Though current results show improvement over the current log-periodic antenna (LPA) used on the system, greater performance could possibly be achieved with higher fidelity construction methods. The chopped Vivaldi dipole antenna can be classified as a highly efficient, electrically small antenna optimized for UWB applications, due to the combination of small size as well as a nearly uniform frequency response and low dispersion in the UHF bandwidth. Though designed for AFIT\u27s Noise Network (NoNET) system, a UHF UWB RNR, the antenna could be applied to a variety of UHF systems looking to optimize the trade-off between size and power budgets

    Comparative analysis of UWB balance Antipodal Vivaldi Antenna for array configuration

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    In this paper, an Ultra-wideband Balance Antipodal Vivaldi Antenna in planar and h-plane array configuration is presented. The comparison of four elements of BAVA array in both planes has been observed. Each element of an antenna printed on the glass-reinforced epoxy laminate material (FR4) with a thickness of 1.5mm and relative permittivity of 4.3. The dimension of every single element is 60.75mm x 66mm approximately. The array elements of both planes almost cover the whole UWB frequency range with the reflection coefficient of -10dB. Based on the simulation results, the array elements in planar configuration showing good reflection and works well at 3.2GHz frequency while the configuration in h-plane the array elements works well at 7GHz of frequency. In planar configuration, the operating frequency of antenna elements is shifting as a result of the distance between inter elements which intensification in wavelength. The array elements in h-plane produce more gain up to 10.2 dB with good radiation patterns as compared to the planar plane. The antenna design and optimization development are verified using CST simulation software

    A Planar Dual Notched Band Vivaldi Antenna for Wireless Communication Applications

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    With the aim of realizing a Vivaldi Antenna (VA) with stop bands for wireless communication applications, this paper introduces a novel, uncomplicated, easily fabricated, and compact planar VA featuring two distinctive rejected frequency bands. The designed VA is engraved onto an FR4-epoxy substrate, measuring 0.4243λ0×0.4296λ0 ×0.01315λ0 at 2.63 GHz. The integration of dual notched band functionality is ingeniously achieved through the implementation of a simple additional strip and a U-formed slit. A physical prototype of the VA was successfully constructed and meticulously measured with the R&S®ZNB Vector Network Analyser. The measured impedance bandwidth demonstrates that the realised VA operates from 2.63 GHz to beyond 12 GHz while effectively excluding two bands: 3.46-4.16 GHz (18.37 %) and 5.32-6.5 GHz (19.97 %). Simulated results indicate that the designed VA can provide stable unidirectional radiation patterns, reasonable realized gain, and acceptable radiation efficiency across its operating ranges, with notable drops observed at the two notched bands. As a result, these findings highlight the practical value of the designed VA for wireless communication applications, particularly in scenarios where the integration of filtering structures in antennas becomes essential to prevent interference with co-existing systems. The presented VA opens new avenues for enhancing wireless communication performance, catering to the increasing demand for reliable and interference-resistant solutions

    Peningkatan Directivity Antena Mimo Vivaldi Coplanar Dengan Corrugated Slot Untuk Aplikasi Ultra-Wideband (UWB)

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    Teknologi komunikasi khususnya teknologi antena dengan bandwidth lebar (Ultra Wide Band/UWB) terus berkembang baik di bidang telekomunikasi radio dan radar. Artikel ini bertujuan membahas Peningkatan directivity antenna MIMO Coplanar Vivaldi dengan design corrugated slot untuk frekuensi Ultra-Wideband Yaitu 3.1-10.6 Ghz. Bentuk Patch Vivaldi dipilih karena memiliki kelebihan dengan memberikan bandwidth yang lebar. Dengan memberikan struktur Corrugated slot dan penyusunan antena Multiple Input Multiple Output (MIMO) maka directivity antena dapat di tingkatkan. Antena Vivaldi ini memiliki dimensi 120mm x 120mm x 1,6 mm, difabrikasi menggunakan bahan FR-4 yang memiliki konstanta dielektrik (εr) = 4.3. Hasil dari simulasi antena MIMO Vivaldi UWB dengan corrugated slot menunjukkan bahwa antena tersebut dapat bekerja pada frekuensi UWB dari 2,31 GHz hingga 10,78 Ghz. Nilai gain tertinggi dihasilkan pada frekuensi 4 GHz sebesar 10 dBi dengan polaradiasi directional. Dengan memberikan struktur corrgated pada elemen antena Coplanar Vivaldi dapat meningkatkan directivity sebesar 1,7 dBi di frekuensi 4 GHz Dengan menyusun antena menjadi MIMO 1x4 secara H-Plane dapat meningkatkan directivity sebesar 7,5 dBi. Kata kunci: Antena, UWB, Vivaldi, Corrugated, MIMO, directivit

    A Bibliometric Survey on Antipodal Vivaldi Antenna

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    In this paper bibliometric survey is presented on Antipodal Vivaldi Antenna. The Antipodal Vivaldi Antenna is a broad band and has symmetric E plane and H plane. It has been used extensively in radars, wireless communication and dual polarization applications. The antipodal Vivaldi antenna has significant researches in biomedical imaging, optical lens, Ground-Penetrating Radar (GPR) System, detecting cancer, 5G communications etc. The bibliometric analysis is done for the reason to understand the reach of antipodal Vivaldi antenna and performance enhancement analysis worldwide. The Scopus and web of science are used for accomplishing this survey. The study focuses on 449 documents of conferences, articles, book chapters, review etc in scopus, where in web of science the study was focused on 95 documents of articles. Web of science has research data base of AVA from 1980 and scopus has its database from 1993. The bibliometric analyses are done using i-mapbuilder, VOS builder, Word bar chart, Word It Out, etc in section 3. The bibliometric survey includes the research of document types, year of publications, the various sources involved in performing quality research, affiliations and funding agencies involved to make the research work completed and keywords. It was observed that documents published are mostly in English language. Apart from English language documentation is also done in Chinese and Turkish. The study of this bibliometric analysis shows that the favorable field for antipodal Vivaldi antenna is done under Engineering and Computer Science fields

    Fundamental issues in antenna design for microwave medical imaging applications

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    This paper surveys the development of microwave medical imaging and the fundamental challenges associated with microwave antennas design for medical imaging applications. Different microwave antennas used in medical imaging applications such as monopoles, bow-tie, vivaldi and pyramidal horn antennas are discussed. The challenges faced when the latter used in medical imaging environment are detailed. The paper provides the possible solutions for the challenges at hand and also provides insight into the modelling work which will help the microwave engineering community to understand the behaviour of the microwave antennas in coupling media

    Wideband Antennas of Passive Seekers for Anti Radiation Missiles

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    Suppression of Enemy Air Defence (SEAD) is a fundamental element of Air Power application by means of in protecting friendly air attackers and destroying the enemy’s ability to defend against air attack. Most of the SEAD operation even today relies on Anti-radiation missile (ARM) which is an air-to-surface tactical missile designed to detect, seek, attack and destroy opponent’s radar. Passive seeker of ARM is a miniaturized ESM receiver which is capable of extracting the necessary angular data from the enemy radar emissions. Single head passive seeker covering wide frequency range from L to Ku band is the preferred choice. Wideband antennas have been designed and utilized for Direction Finding applications of ESM/ELINT receivers for ground, air and ship borne platforms. Unlike these platforms, there are several restrictions for passive seeker based compact ESM receiver for missile borne platform specially air to surface missile where lesser diameter is one of the preferred design parameter. This review paper mainly discusses the existing wideband antennas such as spiral, log-periodic, printed circuit vivaldi and all-metal vivaldi antennas and the comparison of their various parameters for passive seeker. The paper also suggests their suitability with respect to their placement on the missile for three configurations: concealed inside the radome, flush-mounted and conformal antenna based. The paper also brought about the specific test facility required for testing and evaluation of passive seeker to characterize it with missile radome which is the most challenging and time consuming task. Among the three passive seeker configuration discussed, conformal antenna based passive seeker using all-metal Vivaldi is the best option avoiding radome aberration correction which is being utilized in the present third generations of ARM. The second commonly and established passive seeker configuration is concealed inside the radome using spiral antennas where handling radome aberration correction is a limitation.&nbsp

    Dual-Stub Ka-Band Vivaldi Antenna with Integrated Bandpass Filter

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    A dual-stub coplanar Vivaldi antenna with a parasitic element is presented. The dual-stub is coupled between the parasitic element and two tapered slots. The parasitic element shape and size is optimised. The use of slits on the outer edge of the ground plane is shown to provide control of beamwidth and maximum gain. A bandpass filter is used for performance control and sub-harmonic suppression

    Optimization of Multi-Band Characteristics in Fan-Stub Shaped Patch Antenna for LTE (CBRS) and WLAN Bands

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    This study aims to optimize a fan-stub slot patch to get better suitability and performance for Citizens Broadband Radio Service (CBRS). The transition from the tedious configuration of slotted patch antenna in fan-stub shape is evaluated. Also, the impact of stub width W, stub length L, and its orientation are tested. Multiple simulation tests ensure the uniqueness in the type of slots or stubs that affect the multiband nature of patch. The optimization of basic fan-stub structure on return loss S11, Voltage Standing Wave Ratio (VSWR), and the operating band at the desired frequency is performed to accommodate the federal and non-federal use of the band. The simulation results show that the designed antenna is technically suitable to cover 4G LTE in CBRS (LTE-43 and LTE-48 band) as well as 5.5 GHz Wireless Local Area Network (WLAN) band of operation
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