We present a simple and accurate perturbation method for obtaining the propagation characteristics of anisotropic rectangular waveguides described by a diagonal dielectric constant tensor. Comparison with the results ...
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We present a simple and accurate perturbation method for obtaining the propagation characteristics of anisotropic rectangular waveguides described by a diagonal dielectric constant tensor. Comparison with the results of finite-element technique shows an excellent agreement.
A method is given for determining the characteristic equations and field components of the LSE and LSM modes in rectangular waveguides filled with a dielectric which is inhomogeneous in one transverse dimension. The m...
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A method is given for determining the characteristic equations and field components of the LSE and LSM modes in rectangular waveguides filled with a dielectric which is inhomogeneous in one transverse dimension. The method is exact and yields solutions for a nearly arbitrary variation in permittivity across the waveguide.
Certain exact relationships between the radiation pattern and impedance characteristics of a radiating rectangular waveguide with vanishingly thin walls are developed. In particular, it is shown that the ratio of radi...
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Certain exact relationships between the radiation pattern and impedance characteristics of a radiating rectangular waveguide with vanishingly thin walls are developed. In particular, it is shown that the ratio of radiation intensities in certain preferred directions and the power gain in these directions are related in a simple manner to the reflection coefficient inside the waveguide. Although the information obtained is restricted in the sense that it applies to only a few discrete points on the radiation pattern, it is quite general as regards the manner in which the waveguide is broken or perforated to allow radiation. The results are shown to apply equally well if conducting sheets, having arbitrary shapes but lying on specified planes, are present in the vicinity of the radiating waveguide.
A representation of the Green's function for a line current in a rectangular waveguide is given in terms of a rapidly converging series. One can obtain numerical results for a wide class of practical problems by c...
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A representation of the Green's function for a line current in a rectangular waveguide is given in terms of a rapidly converging series. One can obtain numerical results for a wide class of practical problems by combining this representation with the "method of moments." The technique is discussed in general and applied to the problem of computing the reflection coefficients of circular posts in waveguides. Post diameters from 0.14 to 0.97 times the guide width are considered and theoretical results are found to be in good agreement with experimental studies.
A rigorous field theory analysis is presented for cross-irises in rectangular waveguides, as well as for cross-iris coupled rectangular waveguide resonators. Arbitrary iris location, unequal E-and H-plane cross size a...
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A rigorous field theory analysis is presented for cross-irises in rectangular waveguides, as well as for cross-iris coupled rectangular waveguide resonators. Arbitrary iris location, unequal E-and H-plane cross size and finite thickness are rigorously taken into account. The scattering parameters of a cross-iris coupled one-resonator filter in the waveguide Ku-band (12-18 GHz) are presented as a calculation example. The theory is verified by comparison with available data for cut-off frequencies, as well as with measurements.
Measurements have been made at 56.2 GHz of reflection coefficients at the junction of two sections of 0.074- by 0.148-in rectangular waveguide, which are offset in the E or H plane. Special precautions were taken to p...
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Measurements have been made at 56.2 GHz of reflection coefficients at the junction of two sections of 0.074- by 0.148-in rectangular waveguide, which are offset in the E or H plane. Special precautions were taken to preserve identical internal dimensions of the two sections at the junction. A special fixture was built to allow controlled offset movements. The experimental data show good agreement with theoretical calculations. This data was obtained with the object of setting tolerances on waveguide alignment for acceptable reflections at waveguide flange junctions in rectangular waveguide at millimeter wave frequencies.
A miniaturized dielectric-loaded rectangular waveguides, which were used as array elements, were investigated. A lower frequency array that allows larger interelement spacing was embedded onto the base array, by repla...
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ISBN:
(纸本)0780383028
A miniaturized dielectric-loaded rectangular waveguides, which were used as array elements, were investigated. A lower frequency array that allows larger interelement spacing was embedded onto the base array, by replacing every after some number of the base array elements with lower frequency elements. The dielectric-loaded hard-walled quasi-TEM rectangular waveguide offered an alternative solution preserving the TEM behavior. It was concluded that operating the dielectric-loaded rectangular waveguide elements of an infinite planar array within the vicinity of the TEM frequency gives rise to the best transmission.
A finite-range gain expression given in the literature for open-ended rectangular waveguide is improved by employing the gain correction factor approach of Polk by returning to the original aperture field integrals. I...
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A finite-range gain expression given in the literature for open-ended rectangular waveguide is improved by employing the gain correction factor approach of Polk by returning to the original aperture field integrals. In these, the phase factor is approximated to third order and the amplitude factor to second order with distance from the antenna from which series approximations have been obtained to simplify computation of gain. Comparison with measured and/or simulated results shows that the closed-form solution is as accurate as a previous expression beyond the far-field boundary, and is more accurate at shorter distances. The formulation is extended to pyramidal horns where results obtained compare well with experiment.
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