FR2727248A1 - TRANSITION BETWEEN A MICRO-RIBBON LINE AND A WAVE GUIDE - Google Patents

Abstract

a) Transition between a microstrip line and a waveguide, b) transition characterized in that the microstrip line (2) forms with a conductive path (8) passing on the side of the facing substrate, a line bilateral suspended substrate having a length equal to a quarter of the average operating wavelength and in that the conductive path (8) is separated by a slot (9) from the ground line (4) of the micro line - ribbon (2).

Description

"Transition between a micro-ribbon line and an on-line guide

  The present invention relates to a transition

  from a micro-ribbon line to a waveguide, the micro-line

  ribbon whose substrate is in contact with the mass side

  with a wall of a housing, becoming a subsurface

  suspended in contact with the waveguide and a cavity

  under the suspended substrate line, in the housing widens to a section corresponding to the section of the guide

wave connected to this cavity.

  Such a transition is known according to DE 42 41 635 A1. In this case, the micro-ribbon line is a unilateral line with a suspended substrate which is continued by

  a section adapted to the cavity of the waveguide and in

  tact with the wall of the waveguide. The contact of the suspended substrate unilateral line with the wall of the waveguide requires continuous tackings, complicated in

the substrate.

  The object of the present invention is to create a

  corresponding to the definitive type above, and

  a low-loss transition between the micro-line

  ribbon and the waveguide, and which is realized with

means as small as possible.

  For this purpose, the invention relates to a transition corresponding to the type defined above, characterized in that the micro-ribbon line forms with a conductive path

  passing on the side of the substrate opposite, a line

  suspended substrate having a length equal to one

  quarter of the average operating wavelength.

  As according to the invention, the micro-ribbon line

  comes a bilateral line to the substrate suspended on the waveguide, the contacting with the waveguide is

  less complicated than before. Indeed, the bilateral line

  suspended substrate present, also on the side of

  substrate opposite the micro-ribbon line, a line

  reading, without continuous contact of the substrate, contact with

the wall of the waveguide.

  According to other advantageous features of the invention: the conductive path is separated by a slot in the line

mass of the micro-ribbon line.

  - the conductive path is wider than the micro-line

  ribbon. The present invention will be described hereinafter

  in more detail with the help of two examples

  FIG. 1 is a longitudinal section of a transition between a microstrip and a waveguide extending in a straight line, FIG. 2 is a view of the underside of the substrate provided with FIGS. of the mass line,

  FIG. 3 is a view of the upper side of the metal substrate

  or the microstrip line, - Figure 4 is a longitudinal section of a transition between a microstrip line and a waveguide disposed at

angle.

  Figure 1 shows a cross-section of a

  housing 1 comprising a substrate 3 provided with a micro-line

ribbon 2.

  The micro-ribbon line passes on the upper side

  substrate (see Figure 3). The mass line 4, corres-

  It is located on the underside of the substrate (see Figure 2) which rests on the wall 5 of the housing and is in contact therewith. A cavity 6 is formed under the substrate 3 in the wall 5 of the housing; in the exemplary embodiment shown, this cavity is enlarged by step to reach the section of a waveguide 7

flanged on the housing 1.

  As a variant of FIG. 1, the adaptation of the section of the cavity 6 to the section of the waveguide 7 may

  for example, in a linear or para-

  bolic. In any case, the adaptation of the section is

  designed for there to be an impedance transformation

  micro-ribbon line 2 and the waveguide 7. The

  The source range in quasi-TEM mode that develops in the micro-ribbon line 2 on the waveguide 7 is via a bilateral suspended substrate line. This suspended substrate line is formed above the cavity 6 by the microstrip line 2 and a conductive path 8, on the opposite side of the substrate. As the view of the face shows

  bottom of the substrate according to FIG. 2, the conductive path

  8 of the ground line 4 of the micro-ribbon line is

  cut by a slit 9. The bilateral line with substrate sus-

  hanged, that is, the area of overlap between the line

  micro-ribbon 2 and the conductive path 8 has a length cor-

  corresponding to a quarter of the average operating wavelength. The conductive path 8 joins the line of

  mass 4 at the end of the overlapping zone of

  X / 4; this mass line is in contact with the

waveguide 7.

  The bilateral suspended substrate line is as-

  metric, that is to say that the conductive path 8 is wider than the micro-ribbon line 2 which passes over it. This makes it possible to concentrate the waves of the microstrip line 2 with a dispersion as small as possible on the slot 9 in the cavity 6 and thus to inject them into the guide

  7. The bilateral line with suspended substrate,

  also? / 4 is also involved in impedance matching

  between the waveguide 7 and the micro-ribbon line 2.

  Figure 3 shows that the end 10 of the micro-ribbon line 2 has been enlarged. The width of the lines 10 and 8 which form the bilateral suspended substrate line makes it possible to act on the transformation characteristics of this

  Suspended substrate line, X / 4 length.

  In the exemplary embodiment shown in the

  1, the waveguide 7 is coupled to the micro-line

  ribbon 2 in the longitudinal direction. As shown in FIG. 4, the waveguide 7 can also be coupled in

through to the micro-ribbon line 2.

R E V E N D I CATIONS

  1) Transition from a micro-ribbon line to a guide

  the micro-ribbon line whose substrate is in contact with

  mass-side tact with a wall of a housing, becoming a suspended substrate line in contact with the

  waveguide and a cavity below the susceptor line

  hung in the case, widens to a correct section

  corresponding to the section of the waveguide connected to this cavity, characterized in that the microstrip line (2) forms with a conductive path (8) passing on the side of the

  substrate, a bilateral line with a suspended substrate

  having a length equal to one quarter of the length

average operating wave.

  2) Transition according to claim 1, characterized

  in that the conductive path (8) is separated by a slot (9) from the ground line (4) of the microstrip line (2)

  3) Transition according to claim 1, characterized

  in that the conductive path (8) is wider than

the micro-ribbon line (2).