Multiplex filter with dielectric substrate for the transmission of TM modes in the transverse direction

Patent metadata

Field	Value
Publication number	US-10224588-B2
Application number	US-201615142337-A
Country	US
Kind code	B2
Filing date	Apr 29, 2016
Priority date	Apr 30, 2015
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A multiplex filter has at least n filter chambers which are surrounded by a housing and/or at least one insert positioned in the housing. A metal dividing device is constructed in each of the n filter chambers, dividing each filter chamber into m resonator chambers, wherein m≥2. The resonator chambers are coupled perpendicular to the H fields and/or parallel to the central axis or with a component essentially perpendicular to the H fields and/or parallel to the central axis. A common connection is guided into the first filter chamber via a first opening in the housing, and is coupled in the same to the m resonators of the m resonator chambers. As a result of the fact that the coupling is established perpendicular to the H field, the resonator can have a very compact construction.

First claim

The invention claimed is:

1. A multiplex filter comprising:
a housing which has a housing base, a housing cover spaced apart from the housing base, and a circumferential housing wall between the housing base and the housing cover;
at least n filter chambers, wherein n≥2, which are surrounded by the housing and/or at least one insert which is situated in the housing, the at least n filter chambers being arranged along a central axis, which is perpendicular to an H field, or with a component essentially perpendicular to the H field;
a dividing device comprising metal disposed in each of the at least n filter chambers, dividing each filter chamber into m resonator chambers wherein m≥2, the m resonator chambers being arranged perpendicular to the central axis, the dividing devices being arranged parallel to the central axis or with a component essentially parallel to the central axis, the dividing devices disposed in each filter chamber separating the resonating chambers from each other;
at least n dielectrics, one of each of these at least n dielectrics being arranged in each filter chamber;
n−1 separator, every pair of filter chambers which are adjacent along the central axis being separated by one separator, each of the n−1 separators having at least m coupling openings via which every two resonator chambers which are adjacent in a signal transmission direction are coupled to each other;
the resonator chambers being coupled perpendicular to the H field and/or parallel to the central axis or with a component essentially perpendicular to the H field and/or parallel to the central axis;
a common connection which is guided into a first of the filter chambers via a first opening in the housing and is coupled inside the first of the filter chambers to the m resonator chambers; and
m signal line connections which are coupled via m openings in the housing to in the m resonator chambers in the nth filter chamber.

2. A multiplex filter according to claim 1 , wherein:
the n filter chambers are arranged in the signal transmission direction and/or along the central axis, wherein the H field extends radially about the central axis and/or about the signal transmission direction outward; and/or
each of the n filter chambers is intersected centrally or off-center by the central axis.

3. A multiplex filter according to claim 1 , wherein:
the signal transmission direction for each of the m signal line connections runs either from the signal line connection to the common connection or from the common connection to the signal line connection.

4. The multiplex filter according to claim 3 , wherein:
the signal transmission direction runs from one or more of the m signal line connections to the common connection, wherein one resonator of one resonator chamber of a filter chamber is coupled to exactly one resonator of one resonator chamber of a filter chamber which is adjacent in the signal transmission direction; and/or
the signal transmission direction runs from the common connection to one or more of the m signal line connections, wherein one resonator of one resonator chamber of a filter chamber is coupled to one or more resonators of the filter chamber which is adjacent in the signal transmission direction.

5. The multiplex filter according to claim 1 , wherein:
at least one of the at least n filter chambers and/or one of the n dielectrics has a cylindrical shape.

6. The multiplex filter according to claim 1 , wherein:
each of the n−1 separators consists of:
a) a separating leaf; or
b) a metal layer with which one or two end faces of at least one or all of the n dielectrics is coated, wherein the at least one dielectric is constructed as a single piece with the at least one of the n−1 separators, and the coating of the metal layer has at least one recess as the coupling opening.

7. The multiplex filter according to claim 1 , wherein:
the dividing device is formed by a plurality of through-connections inside the dielectric which are arranged in the filter chamber parallel to, or at least with a component parallel to, the central axis, whereby the dielectric is divided into m parts, wherein each of the m parts is situated in one of the m resonator chambers of a filter chamber; and/or
the dielectric inside each filter chamber is composed of m parts which are the same size, wherein each of the m parts is situated in one of the m resonator chambers of a filter chamber, wherein a metal layer is formed between the individual m parts as a dividing device inside the respective filter chamber, and separates the individual resonator chambers inside a filter chamber from each other, wherein the metal layer is arranged parallel to, or at least with a component parallel to, the central axis.

8. The multiplex filter according to claim 7 , wherein:
at least two or all of then dielectrics, or two or all of the m parts of at least one dielectric, consist of a different material; and/or
at least one or all of the n dielectrics have a recess filled with air.

9. The multiplex filter according to claim 7 , wherein:
the first filter chamber includes a region in which the dividing device only extends over a sub-length of a diameter through the first dielectric, thereby forming an opening region in which the common connection is coupled to all m resonators in the first filter chamber, wherein the opening region has a size or length which is less than 50% of a smallest diameter of the first filter chamber.

10. The multiplex filter according to claim 1 , wherein:
the m resonator chambers of at least one of the filter chambers are the same size.

11. The multiplex filter according to claim 1 , wherein:
a) a diameter of at least one of the at least n filter chambers is formed by at least one an annular insert, which is held by a housing wall which receives the insert; and/or
b) at least one anti-turning element is attached between at least one of the n−1 separators and the at least one insert and/or the adjoining dielectric, and prevents the at least one of the n−1 separators and the at least one insert and/or the adjoining dielectric from turning with respect to each other; and/or
c) at least one anti-turning element is attached between the housing base and/or the housing cover and/or the housing wall and the insert in the first filter chamber and the insert in the nth filter chamber, and prevents the housing base and/or the housing cover and/or the housing wall and the insert in the first filter chamber and the insert in the nth filter chamber from turning with respect to each other.

12. The multiplex filter according to claim 11 , wherein:
the insert of at least one filter chamber has wall segments which are adjacent to the inner wall of the housing and which have different thicknesses such that the volumes of the individual resonator chambers of a filter chamber differ from each other.

13. The multiplex filter according to claim 11 , wherein:
the inserts of at least two filter chambers which are not directly adjacent have an opening;
the at least two openings are connected to each other by a channel, wherein the channel runs at least partially inside the housing wall;
an electrical conductor runs between the two resonator chambers inside the channel, thereby capacitively and/or inductively coupling the two resonator chambers to each other.

14. The multiplex filter according to claim 1 , wherein:
the at least n dielectrics have a disk shape; and/or
at least two or all of the n dielectrics differ in their dimensions entirely or partially; and/or
at least one, or all, of the at least n dielectrics entirely or partially fill in a volume of

Assignees

• Kathrein Werke Kg
• Kathrein Se

Inventors

• Weiβ Frank

Classifications

• H01P1/2084 Primary

  with dielectric resonators · CPC title

• H01P5/12

  Coupling devices having more than two ports (H01P5/04 takes precedence) · CPC title

• H01P1/2138

  using hollow waveguide filters (H01P1/2131 takes precedence) · CPC title

• H01P1/2133

  using coaxial filters (H01P1/2131, H01P1/2136 take precedence) · CPC title

• H01P1/208 Primary

  Cascaded cavities; Cascaded resonators inside a hollow waveguide structure (H01P1/205 takes precedence) · CPC title