Nonreciprocal circuit element and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-11062832-B2
Application number	US-201816476602-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Mar 7, 2017
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A cavity is formed in a surface of a dielectric component on the permanent magnet side. The cavity has a bottom surface extending in a direction along one main surface and a side surface extending in a thickness direction crossing the bottom surface. At least a part of the permanent magnet is disposed in the cavity. A surface of at least a part of the permanent magnet disposed in the cavity is fixed to both of the bottom surface and the side surface through an adhesive.

First claim

The invention claimed is:

1. A nonreciprocal circuit element comprising:
a magnetic plate having one main surface and another main surface on a side opposite to the one main surface and having a plurality of input/output terminals;
a dielectric component connected on the one main surface of the magnetic plate;
a permanent magnet connected to the dielectric component on a side opposite to the magnetic plate;
a magnetic yoke connected to the permanent magnet on a side opposite to the magnetic plate; and
a circuit board connected to the other main surface side of the magnetic plate and having a plurality of signal conductors, wherein
a cavity is formed in a surface of the dielectric component on the permanent magnet side, the cavity having a bottom surface extending in a direction along the one main surface and a side surface extending in a thickness direction crossing the bottom surface, at least a part of the permanent magnet is disposed in the cavity, and
a surface of at least a part of the permanent magnet disposed in the cavity is fixed to both of the bottom surface and the side surface through an adhesive, wherein
the magnetic plate includes a plurality of through holes connecting the one main surface with the other main surface.

2. The nonreciprocal circuit element according to claim 1 , wherein the side surface of the cavity includes a missing portion at a part of periphery of the permanent magnet in a two-dimensional view.

3. The nonreciprocal circuit element according to claim 1 , wherein a dimension of the dielectric component in a direction along the one main surface on the magnetic plate side is larger than a dimension of the dielectric component in a direction along the one main surface on the magnet side.

4. The nonreciprocal circuit element according to claim 1 , wherein the dielectric component is connected to the magnetic plate on the inside of the through holes in a two-dimensional view.

5. The nonreciprocal circuit element according to claim 1 , wherein
the circuit board has pad electrodes,
the magnetic plate has a ground electrode, and
the pad electrodes are electrically connected with the input/output terminals and the ground electrode.

6. A method of manufacturing a nonreciprocal circuit element, the method comprising the steps of:
forming a magnetic plate having one main surface and another main surface on a side opposite to the one main surface and having a plurality of input/output terminals;
connecting a dielectric component on the one main surface of the magnetic plate;
connecting a permanent magnet to the dielectric component on a side opposite to the magnetic plate;
connecting a magnetic yoke to the permanent magnet on a side opposite to the magnetic plate; and
connecting a circuit board having a plurality of signal conductors to the other main surface side of the magnetic plate, wherein
a cavity is formed in the dielectric component on a side connected with the permanent magnet, the cavity having a bottom surface extending in a direction along the one main surface and a side surface extending in a thickness direction crossing the bottom surface, and
in the step of connecting a permanent magnet, a surface of at least a part of the permanent magnet disposed in the cavity is fixed to both of the bottom surface and the side surface through an adhesive, in a state in which at least a part of the permanent magnet is disposed in the cavity, wherein
the magnetic plate includes a plurality of through holes connecting the one main surface with the other main surface.

7. The method of manufacturing a nonreciprocal circuit element according to claim 6 , wherein the step of connecting a magnetic yoke is performed while a surface of at least a part of the permanent magnet is kept fixed to both of the bottom surface and the side surface through the adhesive.

Assignees

• Mitsubishi Electric Corp

Inventors

• Ueda Tetsuya
• Shibata Hironobu
• Tarui Yukinobu
• Ishibashi Hidenori

Classifications

• H01P11/003

  Manufacturing lines with conductors on a substrate, e.g. strip lines, slot lines · CPC title

• H01F7/0242

  Magnetic drives, magnetic coupling devices · CPC title

• H01P11/00

  Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type · CPC title

• H01P1/387 Primary

  Strip line circulators · CPC title

• H02K1/02

  characterised by the magnetic material · CPC title