研究目的
To overcome the issues of deep ripple levels in E-plane mainlobe region and significant H-plane beamwidth variation over upper frequency band in conventional balanced antipodal Vivaldi antennas (BAVAs) for ultra-wideband (UWB) applications.
研究成果
The proposed modified BAVAs based on two types of substrate-integrated gradient-index semi-cylindrical lens and cylindrical lens perform a smaller ripple levels in E-plane mainlobe, a wider beamwidth in H-plane and gradual H-plane beamwidth variation over 9 to 18 GHz while keeping good bandwidth characteristics over 2 to 18 GHz. The BAVA with H-plane lens behaves with higher H-plane peak gains in middle and upper frequencies. Moreover, BAVA-Ls possess nearly constant amplitude and low delay dispersion over whole working band.
研究不足
The study focuses on improving ripple levels in E-plane mainlobe and beamwidth in H-plane but does not address other potential issues such as beam squint in E-plane or further improving the antenna directivity of BAVA.
1：Experimental Design and Method Selection:
The study introduces two types of lens configurations (a gradient-index semi-cylindrical lens and a cylindrical lens) in front of BAVA to improve ripples depth of E-plane mainlobe and broaden H-plane beamwidth. Both lenses and BAVA are integrated on the same substrate. The desired refractive indexes of lenses are realized by a combination of a set of air-filled holes in the substrate.
2：Sample Selection and Data Sources:
Prototypes of the modified BAVA with lenses (BAVA-Ls) are designed, fabricated, and experimentally investigated.
3：List of Experimental Equipment and Materials:
The antenna is constructed on RT/duroid 6002 substrate with εr =
4：94 and loss tangent of Experimental Procedures and Operational Workflow:
The performance of the antennas is simulated by CST MWS Transient Solver and measured for comparison.
5：Data Analysis Methods:
The radiation characteristics, VSWR performance, realized gains, and group delay are analyzed to evaluate the performance of the proposed antennas.
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