Analysis and design of circular ridged waveguide components

Børnemann, Jens; Amari, S.; Uher, J.; Vahldieck, R.

doi:10.1109/22.750235

Cited by 42 publications

(20 citation statements)

References 13 publications

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“…D UAL-POLARIZATION antenna feed systems often employ waveguide polarizers which are realized by loading a circular or square waveguide with irises [1], [2], [3], septa [4], grooves [5], or corrugations [6]. These devices have to exhibit a high return loss and provide a differential phase shift between the transmission coefficients of the two principal polarizations with a minimum deviation from 90 .…”

Section: Introductionmentioning

confidence: 99%

Optimum-Iris-Set Concept for Waveguide Polarizers

Virone

Tascone

Peverini

et al. 2007

IEEE Microw. Wireless Compon. Lett.

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Novel profiled irises for the design of waveguide polarizers are presented. The two degrees of freedom of their piecewise-circular profile allow one to better control the frequency behavior of the differential phase shift. Thanks to this feature, an optimum iris set can be found by selecting the discontinuities for which the differential-phase-shift deviation from the average value is minimum in the operative bandwidth. This optimum iris set can be identified for several values of the ratio 0 , where is the waveguide radius and 0 is the free-space wavelength at the central frequency. Hence, even if both the waveguide size and central frequency are assigned in the specifications, polarizers with a very low deviation from 90 of the total differential phase shift can be designed. In this way, the number of waveguide transitions in the antenna feed system can be reduced and the effect of spurious higher-order-mode coupling can be minimized. A Ka-band polarizer in circular waveguide with piecewise-circular-profile irises is described, showing a return loss better than 55 dB and a phase error of about 0.9 in a 10% bandwidth.

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Section: Introductionmentioning

confidence: 99%

Optimum-Iris-Set Concept for Waveguide Polarizers

Virone

Tascone

Peverini

et al. 2007

IEEE Microw. Wireless Compon. Lett.

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“…In order to fulfill all these specifications, design methods for waveguide polarizers have been widely investigated in the past. Generally, these methods are based on parametric analyses of the device [2] or on optimization procedures applied to a starting guess configuration [1], [3]- [5]. However, because of the large number of parameters involved in the polarizer design, and if a good starting guess is not available, these approaches can require a long computation time, sometimes without successful results, because of the presence of local minima.…”

Section: Introductionmentioning

confidence: 99%

“…As reported in [1], the most appealing configuration for broad-band low-loss applications consists of a circular or square waveguide loaded with discontinuities such as irises [1], [2], septa [3], grooves [4], or corrugations [5]. In some cases, two input/output transition sections are also included [1], [6].…”

Section: Introductionmentioning

confidence: 99%

A novel design tool for waveguide polarizers

Virone

Tascone

Baralis

et al. 2005

IEEE Trans. Microwave Theory Techn.

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This paper presents a novel method for the design of broad-band waveguide polarizers. It consists of an interactive procedure where the designer places the zeros of the reflection coefficient for one polarization, simultaneously also controlling the frequency response of the other one and vice versa. In this way, the best matching condition for both polarizations can be found. This design tool is based on an automated phase control procedure and on an algorithmic characterization of the relationship between the two frequency responses. The spurious effects of multimodal interactions, frequency dispersion, and losses are taken into account and compensated by characterizing them with suitable transfer functions. Designs of iris-loaded polarizers in square and circular waveguides are described, with operative bandwidths up to 30%. Measurements on a 10% bandwidth -band prototype show reflection and cross-polarization levels of approximately 50 dB, with a phase error of approximately 0.4 .

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“…Measured and theoretical results for a polarizer with a 90° ± 1° differential phase shift over the operating 7.75-8.55 GHz band show a very good agreement. Figure 1: Type of iris discontinuities used in waveguide polarizer: a) classical iris in circular waveguide; b) rectangular iris in square waveguide; c) the pro posed elliptical iris in circular waveguide.circular ridged waveguides have been proposed and designed by field theoretical techniques in [3]. In this design however the modal characterization of circular ridged waveguides pose some problems, since their cross-section is not conformal to standard coordinate systems.…”

mentioning

confidence: 98%

“…circular ridged waveguides have been proposed and designed by field theoretical techniques in [3]. In this design however the modal characterization of circular ridged waveguides pose some problems, since their cross-section is not conformal to standard coordinate systems.…”

mentioning

confidence: 99%

Analysis and Design of Circular Waveguide Polarizers with Elliptical Irises

Bertin

Piovano

Accatino

et al. 2000

30th European Microwave Conference, 2000

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A new design of a polarizer realized in circular waveguide with the insertion of short lengths of guide with elliptical cross-section is introduced. The new structure, that requires a manufacturing by milling techniques only, compares favourably with circular waveguide implementations, since it is composed only by waveguides with separable cross-section, hence producing a definite advantage in electromagnetic modeling. With respect to previously known solutions using square waveguide sections it has the intrinsic advantage of avoiding the rectangular-to-circular transition when the component is used, as customary, with a circular feed. Measured and theoretical results for a polarizer with a 90° ± 1° differential phase shift over the operating 7.75-8.55 GHz band show a very good agreement. Figure 1: Type of iris discontinuities used in waveguide polarizer: a) classical iris in circular waveguide; b) rectangular iris in square waveguide; c) the pro posed elliptical iris in circular waveguide.circular ridged waveguides have been proposed and designed by field theoretical techniques in [3]. In this design however the modal characterization of circular ridged waveguides pose some problems, since their cross-section is not conformal to standard coordinate systems.

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Analysis and design of circular ridged waveguide components

Cited by 42 publications

References 13 publications

Optimum-Iris-Set Concept for Waveguide Polarizers

Optimum-Iris-Set Concept for Waveguide Polarizers

A novel design tool for waveguide polarizers

Analysis and Design of Circular Waveguide Polarizers with Elliptical Irises

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