Filter and method of designing same

Patent metadata

Field	Value
Publication number	US-10170815-B2
Application number	US-201715433444-A
Country	US
Kind code	B2
Filing date	Feb 15, 2017
Priority date	Feb 26, 2016
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A filter includes: a first resonator and a second resonator; a first strip-shaped conductor which is provided on a dielectric layer provided on a surface of a first wide wall of the first resonator; a first conductor pin which is electrically connected to a first end of the first strip-shaped conductor; a second strip-shaped conductor which is provided on a dielectric layer provided on a surface of a first wide wall of the second resonator; and a second conductor pin which is electrically connected to a first end of the second strip-shaped conductor.

First claim

The invention claimed is:

1. A filter comprising:
a first resonator and a second resonator coupled to each other directly or via one or more other resonators;
a first strip-shaped conductor which is provided on a dielectric layer provided on a surface of a first wide wall of the first resonator;
a first conductor pin which is (i) electrically connected to a first end of the first strip-shaped conductor and (ii) inserted into the first resonator;
a second strip-shaped conductor which is provided on a dielectric layer provided on a surface of a first wide wall of the second resonator; and
a second conductor pin which is (i) electrically connected to a first end of the second strip-shaped conductor and (ii) inserted into the second resonator, wherein
(1) a partition wall having an opening is provided between the first resonator and the second resonator, and the first resonator and the second resonator are coupled to each other via the opening; or
(2) a first partition wall having a first opening is provided between the first resonator and the one or more other resonators and the first resonator and the one or more other resonators are coupled to each other via the first opening, and a second partition wall having a second opening is provided between the second resonator and the one or more other resonators and the second resonator and the one or more other resonators are coupled to each other via the second opening.

2. The filter as set forth in claim 1 , wherein:
the first wide wall of the first resonator partially has a first opening;
the first end of the first strip-shaped conductor is provided above the first opening;
the first conductor pin passes through the first opening;
the first wide wall of the second resonator partially has a second opening;
the first end of the second strip-shaped conductor is provided above the second opening; and
the second conductor pin passes through the second opening.

3. The filter as set forth in claim 1 , wherein (i) the dielectric layer between the first strip-shaped conductor and the first wide wall of the first resonator and (ii) the dielectric layer between the second strip-shaped conductor and the first wide wall of the second resonator each have a thickness which falls within a range from 10 μm to 30 μm.

4. The filter as set forth in of claim 1 , wherein:
the first resonator and the second resonator share a dielectric substrate whose front surface and rear surface are covered by respective of a pair of electric conductor plates; and
the first resonator and the second resonator further include a first post wall and a second post wall, respectively, each constituted by conductor posts provided in a fence-like manner.

5. A filter as set forth in claim 1 , further comprising one or more other resonators coupled between the first resonator and the second resonator.

6. A method of designing a filter,
the filter comprising:
a first resonator and a second resonator each including a narrow wall and a pair of wide walls, the first resonator and second resonator being coupled to each other directly or via one or more other resonators;
a first strip-shaped conductor which is provided on a dielectric layer provided on a surface of a first wide wall of the first resonator;
a first conductor pin which is (i) electrically connected to a first end of the first strip-shaped conductor and (ii) inserted into the first resonator;
a second strip-shaped conductor which is provided on a dielectric layer provided on a surface of a first wide wall of the second resonator; and
a second conductor pin which is (i) electrically connected to a first end of the second strip-shaped conductor and (ii) inserted into the second resonator,
said method comprising the steps of:
(A) obtaining a correlation, between a parameter and an external Q factor, occurring in a case of altering at least one parameter of first through third parameters,
the first parameter being lengths of portions of the respective first and second conductor pins, which portions are inserted into the respective first and second resonators,
the second parameter being (i) a distance between (a) a first short wall, constituting a portion of the narrow wall of the first resonator and (b) the first conductor pin and (ii) a distance between (c) a second short wall constituting a portion of the narrow wall of the second resonator and (d) the second conductor pin,
the third parameter being widths of the respective first and second strip-shaped conductors;

(B) determining, in accordance with a result of the step (A), a parameter corresponding to a desired external Q factor.

Assignees

• Fujikura Ltd

Inventors

• Uemichi Yusuke

Classifications

• H01P5/107

  Hollow-waveguide/strip-line transitions · CPC title

• G06F30/394

  Routing (G06F30/396 takes precedence) · CPC title

• H01P1/20309 Primary

  with dielectric resonator · CPC title

• H01P3/08

  Microstrips; Strip lines · CPC title

• G06F30/36

  Circuit design at the analogue level · CPC title