13 research outputs found
A left-handed/right-handed leaky-wave antenna derived from slotted rectangular hollow waveguide
No full textAnalysis and design of a composite left-/right-handed leaky wave antenna based on the H10 rectangular waveguide mode
No full textThe presented "open" composite left-handed/right-handed (CRHLH) substrate integrated waveguide performs well as a low-profile leaky wave antenna. This design is distinguished due to the fact that it is derived from the approved equivalent circuit model of the H10 rectangular hollow waveguide mode. The wave propagation behaviour is visualised by the dispersion diagram calculated by two different methods, infinite periodic full-wave simulation and Matrix-Pencil analysis of driven field solutions. The periodic configuration is also analysed in terms of the Bloch impedance. Although FR-4 serves as substrate the antenna features an efficiency of about 50% to 60%. The radiation performance demonstrates nearly backfire to almost endfire scanning capability of the antenna by mere frequency variation. Broadside radiation is possible due to the balanced state at 4 GHz
Electromagnetic Field Synthesis by Hierarchical Plane Wave-Based Field Transformation
No full textn optimization-based field synthesis approach is presented that employs a hierarchical plane wave-based field transformation concept for efficient evaluation of the inverse problem forward operator. Irregular transmit antenna array configurations can be used to synthesize a target field distribution in an arbitrarily shaped test volume with full consideration of the antenna element radiation characteristics. For this purpose, a triangular mesh forms the test zone boundary surface on which Rao–Wilton–Glisson (RWG) vector-basis functions perform electric and magnetic field testing. An iterative Krylov subspace solver is employed to solve the ill-posed inverse problem for the transmit antenna coefficients. The effectiveness, accuracy, and efficiency of the proposed field synthesis algorithm are demonstrated for configurations with test zone extents of up to one hundred wavelengths. Moreover, the approach is utilized for antenna measurements, where antenna near-fields are transformed into far-fields
A {Propagating} {Plane}-{Wave} {Based} {Near}-{Field} {Transmission} {Equation} for {Antenna} {Gain} {Determination} from {Irregular} {Measurement} {Samples}
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SEARCH FOR NARROW QUARKONIUM STATES AND PAIR PRODUCTION OF NEW HEAVY QUARKS AT c.m. ENERGIES FROM 33-GeV TO 36.7-GeV
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