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Coax To Stripline Transition

IP.com Disclosure Number: IPCOM000098382D
Original Publication Date: 1960-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Bland, GF: AUTHOR [+3]

Abstract

A right angle transition from a coaxial line to a strip transmission line is provided which utilizes an improved shorting bar for suppressing undesirable radiation.

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Coax To Stripline Transition

A right angle transition from a coaxial line to a strip transmission line is provided which utilizes an improved shorting bar for suppressing undesirable radiation.

The coaxial line 10 has an inner conductor 12 and an outer conductor 14. The strip transmission line 16 has first and second conductive plates 18 and 20, respectively, and a center conductor 22 spaced from the plates 12 and 14 by a dielectric, such as air. To effect the right angle transition, conductor 12 is extended through an opening 24 in plate 18 and electrically connected to conductor 22 by a screw 26. It is necessary to suppress the unwanted parallel plate mode which is produced at the junction of lines 10 and 16. This is accomplished by disposing a V-shaped shorting bar 28 around the junction between the plates 18 and 20.

Bar 28 is made so as to form a semi-circular inner wall at its mid-section. Its ends are gradually flared symmetrically with respect to conductor 22 to a separation of w + 2b, The width of the conductor 22 is w and b is the perpendicular distance between the plates 18 and 20. At this distance the short circuiting effect produced by bar 28 has no influence on the electric field distribution of line 16. The radius of the semi-circular inner wall is shown as being equal to that of the opening 24 and also the inner radius of conductor 14. This radius may be varied in order to compensate for reactance mismatch at the junction of conductors 12 and 22. T...