FR2752339A1 - FREQUENCY DIVIDER - Google Patents

Abstract

The frequency divider consists of a collector waveguide (1) on which are coupled several bandpass filters (2, 3, 4) tuned to different frequency channels. In order for the bandpass filters to be decoupled from each other in the best possible way, which simplifies the design of the divider, the hollow waveguide (1) is dimensioned so that its length L is a multiple of order n (n = 1, 2, 3 ...) of the mean half-wavelength of the entire useful frequency band of the frequency divider. The passage between the collector waveguide (1) and a connection conductor (7) is ensured by a coupling device (6).

Description

STATE OF THE ART The present invention relates to a divider of

  frequency composed of a collector waveguide on which

  are coupled several bandpass filters tuned on different

different frequency channels.

  We know for example such a frequency divider

  according to the document IEEE TRANSACTIONS ON MICORWAVE

  THEORY AND TECHNIQUES, March 1974, pages 332 to 336. The different

  annuity bandwidth filters of this frequency divider

  are coupled to the side walls of the waveguide collect-

  tor. This collector waveguide is short-circuited to an ex-

  end while its other end is connected to the input or output of the connection waveguide constituting the

  frequency divider. To achieve a certain character-

  filter tick for the frequency divider, it is very important at design time to determine the distances between the different bandwidth filters coupled to the guide

wave collector.

  The development of such a frequency divider is very costly, since there is a strong interaction between the

  bandwidth filters. The location of the wire coupling

  very band passing over the collector waveguide very strongly depends on the predetermined frequency channels. For example, to shift only one frequency channel, you must completely re-study the frequency divider from the beginning. The object of the present invention is to create a frequency divider corresponding to the type defined above, for which the interaction of the passband filters is as weak as possible to allow the frequency channels to be modified without having to completely redesign the frequency divider. Advantages of the invention For this purpose, the invention relates to a frequency divider corresponding to the type defined above, characterized in that the length L of the collector waveguide corresponds to the multiple of order n (n = 1, 2, 3 ...) of the half-length

  mean wave of the entire useful frequency range of the

  frequency finder and the transition between the collector waveguide and a connecting waveguide is provided a coupling device. Thus, the collector waveguide functions as a resonant cavity in which the distribution of the field is fixed. This makes it possible to couple all the bandwidth filters at equidistant intervals corresponding to approximately half the wavelength of the entire band.

  useful frequencies on the collector waveguide. The em-

  coupling placements for bandwidth filters no longer depend on the position of the frequency channels and can later be supplemented with other band filters

  bandwidth for other frequency channels.

  According to other advantageous characteristics, the connection waveguide can be a waveguide or a coaxial cable coupled either to one end of the waveguide

  collector either at the other end. As a covering device

  range of a connection waveguide, it is preferred to

  refers to a capacitive or inductive diaphragm.

  For the coupling of a coaxial conductor, its internal conductor can be protruded in the

  collector waveguide as coupling probe.

  The branching waveguide can be coupled either to the longitudinal component of the magnetic field of

  the H10 wave, that is to say a transverse component of the ma-

  of the H10 wave in the collector waveguide. In addition, we can also couple on the field component

  electric wave H10. However, the branch conductor

  in the form of a coaxial cable, is coupled to the electric field

  wave H10 in the hollow waveguide, collector.

  Description of the exemplary embodiments

  The present invention will be described below in more detail with the aid of different embodiments shown in the accompanying drawings in which: - Figure 1 shows a collector waveguide with bandpass filters coupled on one side, - Figure 2 shows a collector waveguide with bandpass filters coupled on two opposite sides, - Figure 3 shows a collector waveguide with a branching waveguide, coupled laterally and bandpass filters coupled on the front faces, - Figure 4 shows a collector waveguide with a branching waveguide coupled laterally and

  multiple bandpass filters coupled on opposite sides.

  The frequency divider shown in Figure 1 consists of a collector waveguide 1 and several bandpass filters 2, 3, 4 connected to a front wall of this

  collector waveguide 1; these filters consist of my-

  known method of one or more hollow body resonators, coupled to each other. The collector waveguide 1 is provided at the end of a partition forming a short-circuit 5 and its other end is coupled by a coupling device

  6 to a connection waveguide 7. The coupling device

  track 6 consists either of an inductive or passive diaphragm or of several rods penetrating into the waveguide. The

  length L of the collector waveguide 1, i.e. the distance

  tance between the coupling device 6 and the short wall

  circuit 7 corresponds to a multiple of order n (n = 1, 2, 3 ...)

  of the average half-wavelength of the whole band of the frequencies

  useful frequencies of the frequency divider. This dimensioning of the length and the use of a coupling device at the junction with a hollow connection waveguide 7 makes the collecting waveguide function like a hollow resonator in which stationary waves are established. That

  allows the bandpass filters 2, 3, 4 to be coupled to

  equidistant tervalles 1 corresponding to the half-length

  average wave of the useful frequency band or at a multi-

  Whole triple of this length on the collector waveguide 1 where the maximums of the magnetic field of the H10 mode wave lie in the collector waveguide. For

  choose the coupling points of the bandpass filters, the position of the frequency channel associated with the bandpass filters

  respective band in the whole useful frequency band plays no role. This is why we can also add ul-

  bandpass filters for other channels

  frequency in the useful frequency band or replace them without having to develop a new frequency divider. While the example of realization according to the fi-

  gure 1 has bandpass filters 2, 3, 4 on the short side of the collecting waveguide 1, rectangular, bandpass filters can also be coupled on the two opposite small sides of the collecting waveguide 1. Furthermore, according to

  FIG. 2, it is possible to couple bandpass filters 8, 9, 10 10, 11 on one or both short sides of the waveguide col-

reader 1.

  In the embodiment shown in FIG. 3 of a frequency divider, a connecting waveguide

  12 is coupled to a side wall, namely the short side of the collector waveguide 1 via a coupling device 13 (preferably a capacitive or inductive diaphragm). The location of the coupling of the connection waveguide 12 is chosen to be coupled to the longitudinal component of the magnetic field of the H1020 wave in the collecting waveguide 1. The bandpass filters 14, 15 are coupled to the front faces of the waveguide

  manifold 1. You can also couple pass filters

  band laterally on the collector waveguide as in the exemplary embodiments of FIGS. 1 and 2. The exemplary embodiment of FIG. 4 shows two bandpass filters

  16, 17 coupled on opposite sides of the waveguide collectors

  tor 1 opposite the branching waveguide, and at a

  distance 1 = X / 2 by coupling pins 18, 19.

  The exemplary embodiments described above

  give some possibilities of coupling bandpass filters on a collector waveguide. In principle, all

  electrical or magnetic range of bandpass filters on the collector waveguide is possible at the location of a maximum of the magnetic electric field of the H10 wave in the collector waveguide.

  In the exemplary embodiments represented in the drawings, the branching waveguide is a waveguide 7, 12. The branching waveguide can also be a coaxial conductor whose inner conductor penetrates for example as coupling probe in the collecting waveguide and is coupled to the electric field of the HlO wave in the collecting waveguide. The branching waveguides can also be constituted by a microstrip conductor. For this, we can use transitions according to

  the state of the art of microstrip conductor to waveguides for coupling to the collector waveguide.

Claims (5)

R E V E N D I C A T I O NS   1) Frequency divider composed of a collective waveguide   tor on which are coupled several bandpass filters tuned on different frequency channels, characterized in that the length L of the collector waveguide (1) corresponds to the multiple of order n (n = 1, 2, 3 .. .) half-length   mean wave of the entire useful frequency range of the   frequency finder and, - at the transition between the collecting waveguide (1) and a connecting waveguide (7.12), a device is provided coupling (6, 13).   2) Frequency divider according to claim 1, characterized in that   the collector waveguide (1) is short-circuited to an ex-   end and the connection waveguide (7) is coupled to   the other end of the collector waveguide (1).   3) Frequency divider according to claim 1, characterized in that the branching waveguide (12) is coupled laterally on the collector waveguide (1).   4) Frequency divider according to one of claims 1,   2, 3, characterized in that the branching waveguide (12) is a waveguide on   which is coupled the longitudinal component of the ma-   Gnetics of the H10 wave in the collector waveguide (1).    ) Frequency divider according to one of claims 1,   2, 3, characterized in that the branching waveguide (12) is a waveguide coupled to a transverse component of the magnetic field of   the H10 wave in the collector waveguide (1).   6) Frequency divider according to one of the preceding claims,   characterized in that the coupling device comprises a capacitive or inductive diaphragm (6, 13).   ) Frequency divider according to one of claims 1,   2, 3, characterized in that the connection waveguide is a coaxial conductor, the inner conductor of which serves as a coupling probe coupled to the   electric field of the HO10 wave in the collector waveguide.