Irreversible circuit element and module

Patent metadata

Field	Value
Publication number	US-10027008-B2
Application number	US-201715620849-A
Country	US
Kind code	B2
Filing date	Jun 13, 2017
Priority date	Mar 8, 2013
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

An irreversible circuit element includes first and second high pass isolators each including first and second center electrodes intersecting with and being insulated from each other on a ferrite to which a direct-current magnetic field is applied with a permanent magnet. One end of the first center electrode is an output port and the other end thereof is an input port, and one end of the second center electrode is another output port and the other end thereof is a ground port. A pass frequency band of the first isolator is higher than a pass frequency band of the second isolator. Respective output portions of the first and second isolators are electrically connected and defined as one output terminal, and a low pass filter LPF is inserted between the output terminal and the output port of the second isolator.

First claim

What is claimed is:

1. An irreversible circuit element comprising:
first to N th high pass isolators, where N is an integer equal to or greater than 2, each including first and second center electrodes intersecting with and insulated from each other on a ferrite to which a direct-current magnetic field is applied with a permanent magnet, one end of the first center electrode is an output port and the other end of the first center electrode is an input port, and one end of the second center electrode is another output port and the other end of the second center electrode is a ground port in each of the first to N th high pass isolators, a resistance element and a capacitance element connected in parallel to each other are connected between the input port and the output port in series in each of the first to N th high pass isolators; wherein
a pass frequency band of the N−1 th isolator is higher than a pass frequency band of the N th isolator;
respective output portions of the first and up to N th isolators are electrically connected and define one output terminal; and
a high pass filter is disposed between the output terminal and the output port of the first isolator, a bandpass or low pass filter is disposed between the output terminal and the output port of each of the second and N−1 th isolators, and a low pass filter is disposed between the output terminal and the output port of the N th isolator.

2. The irreversible circuit element according to claim 1 , wherein the low pass filter is an L-type filter or an π-type filter including an inductor and a capacitor.

3. The irreversible circuit element according to claim 1 , wherein the low pass filter includes at least two low pass filters connected in two stages.

4. The irreversible circuit element according to claim 1 , wherein the low pass filter includes a strip line.

5. A module comprising:
the irreversible circuit element according to claim 1 ; wherein
the output terminal of the irreversible circuit element is connected to an antenna side.

6. The irreversible circuit element according to claim 1 , wherein in the first to N th isolators, input/output terminals of at least one filter are connected between the resistance element and the output port or the input port, and a ground terminal of the at least one filter is connected to the input port or the output port.

7. A module comprising:
the irreversible circuit element according to claim 6 ; wherein
the at least one filter passes a transmission band signal and attenuates a receiving band signal; and
the module further includes a branch circuit element that causes a transmission signal and a receiving signal to branch to the input port of the first isolator and/or the second isolator provided with the at least one filter.

Assignees

• Murata Manufacturing Co

Inventors

• Wada Takaya
• Yamada Yoshiki

Classifications

• H01P1/213

  combining or separating two or more different frequencies (H01P1/215 takes precedence) · CPC title

• H01F2038/146

  in combination with capacitive coupling · CPC title

• H01F38/14

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H01F7/0278

  for generating uniform fields, focusing, deflecting electrically charged particles (for magnetic separation by Lorentz force B03C1/023; specially adapted for NMR applications G01R33/383) · CPC title

• H01P1/2135

  using strip line filters (H01P1/2131 takes precedence) · CPC title