Complex circuit, circuit device, circuit board, and communication device

Patent metadata

Field	Value
Publication number	US-9722570-B2
Application number	US-201515039338-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Oct 28, 2014
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

PROBLEM: To provide a high-performance complex circuit, circuit device, circuit board, and communication device that support a wider band of frequencies.
SOLUTION: A complex circuit includes a first diplexer that passes through the normal-phase signals of balanced signals and a second diplexer that passes through the reverse-phase signals of the balanced signals. A balun includes a low frequency band first balun element and a high frequency band second balun element. The first balun element and the second balun element respectively include a plurality of lines that are connected to the first diplexer and that carry signals occupying two different frequency bands and also respectively include a plurality of lines that are connected to the second diplexer and that carry signals occupying two different frequency bands. The lines form one pair of balanced lines, and the lines form another pair of balanced lines. Furthermore, the first balun element and the second balun element each include an unbalanced line.

First claim

What is claimed is:

1. A circuit, comprising:
a multiplexing/demultiplexing unit, and a balun unit,
wherein the multiplexing/demultiplexing unit has a first multiplexing/demultiplexing unit that passes normal-phase signals of balanced signals of a plurality of differing frequency bands, and a second multiplexing/demultiplexing unit that passes reverse-phase signals of said balanced signals, and
wherein the balun unit includes a plurality of balun elements, each balun element having a single unbalanced line and a pair of balanced lines, said balanced lines being respectively connected to the first multiplexing/demultiplexing unit and the second multiplexing/demultiplexing unit for respectively passing the normal-phase signals and the reverse-phase signals of one of the frequency bands.

2. The circuit according to claim 1 ,
wherein the first multiplexing/demultiplexing unit has a first low-pass filter and a first high-pass filter, and
wherein the second multiplexing/demultiplexing unit has a second low-pass filter that has a same cutoff frequency as the first low-pass filter and a second high-pass filter that has a same cutoff frequency as the first high-pass filter.

3. The circuit according to claim 1 , further comprising:
attenuation circuits that form attenuation poles for each of the frequency bands and that are respectively connected to the unbalanced lines of the balun elements.

4. A circuit device, comprising:
a multilayer member having a plurality of sheets on which conductive patterns are respectively layered together,
wherein the multilayer member has a first circuit pattern that forms a multiplexing/demultiplexing unit and a second circuit pattern that forms a balun unit,
wherein the multiplexing/demultiplexing unit formed by the first circuit pattern has a first multiplexing/demultiplexing unit that passes normal-phase signals of balanced signals of a plurality of differing frequency bands, and a second multiplexing/demultiplexing unit that passes reverse-phase signals of the balanced signals, and
wherein the balun unit formed by the second circuit pattern includes a plurality of balun elements, each balun element having a single unbalanced line and a pair of balanced lines, said balanced lines being respectively connected to the first multiplexing/demultiplexing unit and the second multiplexing/demultiplexing unit for respectively passing the normal-phase signals and the reverse-phase signals of one of the frequency bands.

5. The circuit device according to claim 4 ,
wherein the multilayer member includes a ground electrode sheet on which a ground electrode is formed, and
wherein, with respect to the multilayer member, one or more sheets of the first circuit pattern on which is formed a conductive pattern other than a conductive pattern formed on the ground electrode sheet is arranged between the ground electrode sheet and one or more sheets of the second circuit pattern on which is formed a conductive pattern other than the conductive pattern formed on the ground electrode sheet.

6. The circuit device according to claim 4 , wherein at least the second circuit pattern has:
a first area in which are formed lines that, among the signals of the plurality of frequency bands, pass signals that have a first frequency band; and
a second area that is arranged separately from the first area when viewed from a layering direction of the multilayer member and in which are formed lines that, among the signals of the plurality of frequency bands, pass signals that have a second frequency band differing from the first frequency band.

7. The circuit device according to claim 6 , wherein inductor electrodes that form a part of the first circuit pattern are divided between the first area and the second area when viewed from the layering direction of the multilayer member.

8. The circuit device according to claim 6 , wherein a length of the lines formed in the first area of the second circuit pattern is different than a length of the lines formed in the second area of the second circuit pattern.

9. The circuit device according to claim 4 ,
wherein the multilayer member includes:
one or more first sheets that have a first thickness and form a part of the second circuit pattern; and
a second sheet that forms a part of the second circuit pattern, that is arranged between the one or more first sheets of the second circuit pattern and a sheet of the first circuit pattern, and that has a second thickness greater than the first thickness.

10. A circuit board, comprising:
a substrate;
a first circuit pattern forming a multiplexing/demultiplexing unit; and
a second circuit pattern forming a balun unit,
wherein the multiplexing/demultiplexing unit formed by the first circuit pattern has a first multiplexing/demultiplexing unit that passes normal-phase signals of balanced signals of a plurality of differing frequency bands, and a second multiplexing/demultiplexing unit that passes reverse-phase signals of the balanced signals,
wherein the balun unit formed by the second circuit pattern includes a plurality of balun elements, each balun element having a single unbalanced line and a pair of balanced lines, said balanced lines being respectively connected to the first multiplexing/demultiplexing unit and the second multiplexing/demultiplexing unit for respectively passing the normal-phase signals and the reverse-phase signals of one of the frequency bands, and
wherein at least a portion of lines of the first circuit pattern and a portion of lines of the second circuit pattern are formed on the substrate.

11. A communication device, comprising:
an antenna that receives signals of a plurality of differing frequency bands or that outputs said signals; and
a circuit that has a multiplexing/demultiplexing unit and a balun unit,
wherein the multiplexing/demultiplexing unit of the circuit has a first multiplexing/demultiplexing unit that passes normal-phase signals of balanced signals of a plurality of differing frequency bands, and a second multiplexing/demultiplexing unit that passes reverse-phase signals of the balanced signals, and
wherein the balun unit of the circuit includes a plurality of balun elements, each balun element having a single unbalanced line and a pair of balanced lines, said balanced lines being respectively connected to the first multiplexing/demultiplexing unit and the second multiplexing/demultiplexing unit for respectively passing the normal-phase signals and the reverse-phase signals of one of the frequency bands.

Assignees

• Taiyo Yuden Kk

Inventors

• Saito Toshiyuki

Classifications

• H03H7/42

  Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns · CPC title

• H03H7/0115

  comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence) · CPC title

• H03H7/46 Primary

  Networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source · CPC title

• H04B1/40

  Circuits · CPC title

• H01F19/06

  Broad-band transformers, e.g. suitable for handling frequencies well down into the audio range · CPC title