GB845492A - Improvements in or relating to electromagnetic waveguide transmission systems - Google Patents
Improvements in or relating to electromagnetic waveguide transmission systemsInfo
- Publication number
- GB845492A GB845492A GB27042/58A GB2704258A GB845492A GB 845492 A GB845492 A GB 845492A GB 27042/58 A GB27042/58 A GB 27042/58A GB 2704258 A GB2704258 A GB 2704258A GB 845492 A GB845492 A GB 845492A
- Authority
- GB
- United Kingdom
- Prior art keywords
- curvature
- bend
- guide
- waveguide
- constant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/02—Bends; Corners; Twists
Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
- Waveguide Connection Structure (AREA)
Abstract
845,492. Waveguides. WESTERN ELECTRIC CO. Inc. Aug. 22, 1958 [Aug. 29, 1957], No. 27042/58. Class 40(8). A bend in a circular waveguide for the transmission of H 01 mode energy is constructed so that it has a gradually increasing curvature in the neighbourhood of its junction with the straight sections of the guide. Such a bend minimizes mode conversion losses due to the curvature discontinuities which occur at the extremities of a bend having a constant radius of curvature. It is stated that optimum transmission characteristics are obtained if the curvature function, e.g. the curvature expressed as a function of axial waveguide length, is the Fourier transform of a Tschebyscheff polynomial of infinite degree. The bend may be constructed by constraining a waveguide 43 to the shape of a template 41 and clamping the guide in position with clamps 42. In a modification, the curvature k, Fig. 6A, is arranged to increase linearly to a maximum value and then to decrease linearly to zero. Such a bend may be obtained by bending the waveguide around a fixed pin having a radius negligible compared to the axial length of the bend. In a further modification, the central portion of the bend has a constant curvature k 0 , Fig. 6B, and a linearly diminishing curvature to either side of the central portion. This bend may be constructed by bending the guide around a pin 61, Fig. 7, of radius R 0 = 1/ko so that the portion of the guide in contact with the pin acquires a constant curvature k 0 . Where the elastic deformation limits of the guide are exceeded the bending method shown in Fig. 5 is employed. The waveguide may be of the type in which degeneracy between the H 01 and E 11 modes has been reduced by known techniques. The length of the portions of tapered curvature should be of the order of, or longer than, the longest beat wavelength associated with the structure, i.e. 1 #2#/## where ## is the smallest difference in phase constant between the H 01 and unwanted higher modes. Specifications 764,737, 845,253 and U.S.A. Specifications 2,751,561, 2,774,945 and 2,779,006 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US681027A US2914741A (en) | 1957-08-29 | 1957-08-29 | Waveguide bend |
Publications (1)
Publication Number | Publication Date |
---|---|
GB845492A true GB845492A (en) | 1960-08-24 |
Family
ID=24733495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27042/58A Expired GB845492A (en) | 1957-08-29 | 1958-08-22 | Improvements in or relating to electromagnetic waveguide transmission systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US2914741A (en) |
DE (1) | DE1071168B (en) |
FR (1) | FR1209693A (en) |
GB (1) | GB845492A (en) |
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Also Published As
Publication number | Publication date |
---|---|
DE1071168B (en) | |
FR1209693A (en) | 1960-03-03 |
US2914741A (en) | 1959-11-24 |
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