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Microwave filter has coaxial structure manufactured by metallized synthetic foam

A microwave filter, coaxial structure technology, applied in waveguide type devices, electrical components, circuits, etc., can solve the problems of complicated microwave filter, dielectric loss, expensive and so on

Inactive Publication Date: 2010-01-20
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, realizing such a microwave filter with a coaxial structure proved to be complex and expensive, especially in order to maintain perfect coaxiality between the inner and outer cores of the filter.
Usually spacers made of plastic or another dielectric material are used to keep the coaxiality, but this introduces dielectric losses

Method used

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  • Microwave filter has coaxial structure manufactured by metallized synthetic foam
  • Microwave filter has coaxial structure manufactured by metallized synthetic foam
  • Microwave filter has coaxial structure manufactured by metallized synthetic foam

Examples

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Embodiment Construction

[0015] exist figure 1 A first example of a microwave filter with a coaxial structure according to the present invention is shown in an exploded perspective view.

[0016] For more clarity, in figure 1 The outer conductive tube 1 and the inner conductive rod 2 of the filter are shown separated from each other, but it must be understood that the rod 2 extends along the axial direction A in the outer tube 1 .

[0017] The inner rod 2 of the filter consists of a cylindrical rod made of synthetic foam, the outer surface of which follows a periodic function according to the axial direction. It is preferably formed as a continuous concentric crenellation 3A-3D to fulfill the transfer function of a filter, eg a low-pass filter by defining successive sections of the low and high characteristic impedance axes. The construction of the foam rod 2 takes place by thermoforming, in particular according to thermocompression molding techniques. The outer surface of the metallized foam rod 2...

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PUM

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Abstract

The invention relates to a microwave filter comprising a coaxial structure, consisting of a tubular outer conductor ( 1 ) and an inner bar conductor ( 2 ). According to the invention, the inner bar conductor extends in an axial direction ( A ) inside the outer tube and, together with said tube, forms a series of concentric slots ( 3A-3D ) in the axial direction, thereby defining successive coaxial line segments with low characteristic impedance and coaxial line segments with high characteristic impedance. The aforementioned concentric slots are produced in a synthetic foam block.

Description

technical field [0001] The present invention relates to a microwave filter with a coaxial structure, which includes an outer conductive core and an inner conductive core, the inner conductive core extends in the outer conductive core according to the axial direction and forms a continuous concentric crenelation (crenelation) with the outer conductive core according to the axial direction ) to determine successive low characteristic impedance axis and high characteristic impedance axis parts. Background technique [0002] In 1962, Mgraw Hill described such a microwave filter, especially a low-pass filter, in the document "Microwave Filter, Impedance Matching Network and Coupling Structure". Cylindrical metal rods build the outer conductive core, and the metal discs form continuous concentric open crenellations. The cross-section of the inner core thus varies axially such that each larger diameter portion of the inner core (corresponding to the metal disc) defines a portion o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/202
CPCH01P1/202
Inventor 多米尼克·洛心唐阿利·洛泽菲利普·钱伯林克里斯琴·珀森让-菲利普·库普兹
Owner THOMSON LICENSING SA
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