# US 10,770,773 B2 · Electronic apparatus

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- Number: US 10,770,773 B2
- Document ID: US10770773B2
- Status: Granted
- Kind: B2
- Application number: 16/751,239
- Filed: 2020-01-24
- Published: 2020-05-21
- Granted: 2020-09-08
- Earliest claimed: 2014-12-01
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Takahiro Baba; Nobuo Ikemoto; Kosuke Nishino; Jun Sasaki
- Web page: https://patentgrep.com/patent/US10770773B2

## CPC

- H01P 3/085: {Triplate lines}
- H01P 3/08: Microstrips; Strip lines
- H05K 1/0239: {Signal transmission by AC coupling}
- H05K 1/0242: {Structural details of individual signal conductors, e.g. related to the skin effect}
- H05K 1/0245: {Lay-out of balanced signal pairs, e.g. differential lines or twisted lines}
- H05K 1/0298: {Multilayer circuits}
- H05K 1/0313: {Organic insulating material}
- H05K 1/111: {Pads for surface mounting, e.g. lay-out}
- H05K 1/141: {One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters (H05K1/142 and H05K1/147 take precedence)}
- H05K 1/147: {at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit (H05K1/148 takes precedence)}
- H01P 3/026: {Coplanar striplines [CPS]}
- H05K 1/0243: {Printed circuits associated with mounted high frequency components}
- H05K 1/144: {Stacked arrangements of planar printed circuit boards}
- H05K 2201/0141: Liquid crystal polymer [LCP]
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

An electronic apparatus includes a first substrate and a second substrate mounted on the first substrate and having a smaller area than the first substrate. The second substrate extends in a longitudinal direction and has a planar or substantially planar shape with a uniform or substantially uniform width across all portions of the second substrate in the longitudinal direction. The second substrate includes a signal line, and a high-frequency transmission line including the signal line, and further includes an input/output pad electrically connected to the signal line, and an auxiliary pad arranged between two input/output pads, on the mounting surface of the second substrate. The first substrate includes lands each connected to the input/output pad and the auxiliary pad. The input/output pad and the auxiliary pad are each soldered on each of the lands of the first substrate and, thus, the second substrate is surface-mounted on the first substrate.

## Claims

### Claim 1

An electronic apparatus comprising:
a first substrate that includes a mounting surface; and
a second substrate that includes a mounting surface, is mounted on the first substrate, and has a smaller area than the first substrate; wherein the second substrate extends in a longitudinal direction;
the second substrate includes:
a signal line;
a high-frequency transmission line including the signal line;
a plurality of input/output pads electrically connected to the signal line, on the mounting surface of the second substrate; and
an auxiliary pad arranged between at least two input/output pads among the plurality of input/output pads on the mounting surface of the second substrate;
the first substrate includes a plurality of lands provided on the mounting surface of the first substrate, each of the plurality of lands being respectively connected to a corresponding input/output pad of the plurality of input/output pads or the auxiliary pad;
each of the input/output pad of the plurality of input/output pads and the auxiliary pad is respectively soldered to a corresponding land of the plurality of lands on the mounting surface of the first substrate and the second substrate is surface-mounted on the first substrate in a state in which an entirety or substantially an entirety of the mounting surface of the second substrate faces the mounting surface of the first substrate;
the second substrate includes a base material with a dielectric constant lower than a dielectric constant of the first substrate;
the high-frequency transmission line includes a ground conductor;
a protective film including at least one opening is provided on the ground conductor; and
the auxiliary pad is defined by a portion of the ground conductor exposed in the at least one opening.

### Claim 2 (depends on 1)

The electronic apparatus according to claim 1, wherein the at least two input/output pads and the auxiliary pad are arranged in the longitudinal direction.

### Claim 3 (depends on 1)

The electronic apparatus according to claim 1, wherein the auxiliary pad includes a plurality of auxiliary pads.

### Claim 4 (depends on 3)

The electronic apparatus according to claim 3, wherein the plurality of auxiliary pads include at least three auxiliary pads.

### Claim 5 (depends on 4)

The electronic apparatus according to claim 4, wherein the plurality of auxiliary pads include a plurality of auxiliary pads provided at equal or substantially equal intervals.

### Claim 6 (depends on 5)

The electronic apparatus according to claim 5, wherein the plurality of auxiliary pads are arranged in two lines in the longitudinal direction so as to interpose at least one of the plurality of input/output pads between the two lines in a width direction perpendicular or substantially perpendicular to the longitudinal direction.

### Claim 7 (depends on 4)

The electronic apparatus according to claim 4, wherein the plurality of auxiliary pads are arranged in two lines in the longitudinal direction so as to interpose at least one of the plurality of input/output pads between the two lines in a width direction perpendicular or substantially perpendicular to the longitudinal direction.

### Claim 8 (depends on 4)

The electronic apparatus according to claim 4, wherein the plurality of auxiliary pads interpose at least one of the plurality of input/output pads in the longitudinal direction.

### Claim 9 (depends on 3)

The electronic apparatus according to claim 3, wherein the plurality of auxiliary pads interpose at least one of the plurality of input/output pads in the longitudinal direction.

### Claim 10 (depends on 3)

The electronic apparatus according to claim 3, wherein the plurality of auxiliary pads are arranged in two lines in the longitudinal direction so as to interpose at least one of the plurality of input/output pads between the two lines in a width direction perpendicular or substantially perpendicular to the longitudinal direction.