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Approximate formulas for the far field and gain of open-ended rectangular waveguide

Approximate formulas for the far field and gain of open-ended rectangular waveguide,10.1109/TAP.1984.1143332,IEEE Transactions on Antennas and Propaga

Approximate formulas for the far field and gain of open-ended rectangular waveguide   (Citations: 35)
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    • ...Accordingly, we have first of all characterized the employed probe according to [10] as done in the software package MI-3000 implementing the standard probe compensated NF–FF transformation [2]...

    F. D'Agostinoet al. Laboratory tests on the direct cylindrical NF - FF transformation for ...

    • ...[22]. The gain measurements shown in Fig. 11 were taken in the directivity direction which coincides with the z axis direction as it is defined in Fig. 1. As can be seen, the presence of the resonating elements and the frequency mismatch cause a significant degradation on the gain value at the frequency band to be rejected in a reconfiguring way...

    Symeon Nikolaouet al. UWB Elliptical Monopoles With a Reconfigurable Band Notch Using MEMS S...

    • ...The co-polar and cross-polar far-field pattern were measured with two probe horns as shown in Fig. 7 .I n Fig.8, the co-polar patterns are compared with an approximate formula for an open-ended waveguide [31 ]a nd are consistent with the calculation...

    Masato Naruseet al. Near-field beam pattern measurement of qualification model of ALMA ban...

    • ...The beam profile at a distance z from the WG end can be calculated from diffraction theory by considering an expansion of the fundamental TE10 mode of the waveguide into the free space and by integrating over the open WG end [20]...
    • ...Following Ref. [20], we calculated the power profile P/Pmax as a function of x, y and z. Along x (the electric field direction) P/Pmax can be approximated with that of a spherical wave, hence it has a Lorentzian shape of width 2z and decaying as 1/x 2 . Along y (the H-plane of antenna theory) the decay of P/Pmax for large y is faster than in the x direction, while for y-values inside the waveguide section P/Pmax is almost constant...
    • ...[20]. The value of z was allowed to vary as a free parameter and best-fit curves, displayed as grey lines in Fig. 6, correspond to a best-fit value of z = 0.76 mm, not far from the geometrically determined value of 1 mm...
    • ...[20] account quite well for the diffraction effects along both directions, within the lateral resolution of our setup...

    Michele Ortolaniet al. Study of the Coupling of Terahertz Radiation to Heterostructure Transi...

    • ...These probes are often treated as first-order probes [3] in spherical near-field antenna measurement systems, and the well-known, computationally efficient first-order probe correction technique is applied [4]...

    Tommi Laitinen. Modified Scanning Technique for First/Third-Order Probes for Spherical...

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