Communication control device and mounting board

Patent metadata

Field	Value
Publication number	US-2016156231-A1
Application number	US-201314896867-A
Country	US
Kind code	A1
Filing date	Jun 14, 2013
Priority date	Jun 14, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

In a communication control device in which an antenna electrode having an antenna connected thereto, a power supply circuit, and a communication circuit are mounted on a mounting board, the antenna electrode is disposed at one corner portion on a principal surface of the mounting board, the communication circuit is disposed on a side of a first side of the principal surface that shares the corner portion, and the power supply circuit is disposed on a side of a second side facing the first side. Further, a first signal path connecting the antenna electrode and the communication circuit extends along the first side, and a second signal path connecting the antenna electrode and the power supply circuit extends along a third side that shares the corner portion and is perpendicular to the first side.

First claim

What is claimed is:

1 . A communication control device which is mounted on a mounting board, the device comprising:
an antenna electrode to which an antenna is connected; a power supply circuit which is connected to the antenna electrode; and a communication circuit which is connected to the antenna electrode, wherein the antenna electrode is disposed at one corner portion on a first principal surface of the mounting board, the communication circuit is disposed on a side of a first side of the first principal surface which shares the corner portion, the power supply circuit is disposed on a side of a second side facing the first side, a first signal path connecting the antenna electrode and the communication circuit extends along the first side, and a second signal path connecting the antenna electrode and the power supply circuit extends along a third side that shares the corner portion and is perpendicular to the first side.

2 . The communication control device according to claim 1 , wherein
the power supply circuit includes
a rectifier circuit that rectifies an AC signal which is supplied to the antenna electrode, and
a DC/DC converter that generates a DC voltage on the basis of a voltage which is rectified by the rectifier circuit,
the second signal path includes a signal path for transmitting a signal from the antenna electrode to the rectifier circuit, the rectifier circuit is disposed along the third side, and the DC/DC converter is disposed so as to be separated from the rectifier circuit in a direction of a fourth side facing the third side.

3 . The communication control device according to claim 2 , wherein
the mounting board is a multi-layered substrate including a plurality of conductive layers, the antenna electrode, the power supply circuit, the communication circuit, the first signal path, the second signal path, and a first ground pattern for connection to a ground potential are formed on the first conductive layer constituting the first principal surface in the mounting board, the first ground pattern is formed in the vicinity of the first signal path and the second signal path, and the first ground pattern has a slit formed along at least a portion of the second signal path, in a region interposed between the first signal path and the second signal path.

4 . The communication control device according to claim 3 , wherein
a second ground pattern for connection to a ground potential is formed on a second conductive layer different from the first conductive layer so as to overlap the first signal path and the second signal path which are formed on the first conductive layer, when seen in a plan view, and the second ground pattern has a slit formed along at least a portion of the second signal path, in a region interposed between the first signal path and the second signal path when seen in a plan view.

5 . The communication control device according to claim 4 , wherein the second ground pattern has a slit formed along at least a portion of the first signal path, in a region interposed between the first signal path and the second signal path when seen in a plan view.

6 . The communication control device according to claim 4 , wherein the second conductive layer is a layer which is adjacent to the first conductive layer.

7 . The communication control device according to claim 6 , wherein a width of the slit formed in each of the first ground pattern and the second ground pattern is set to be three times or more as large as a minimum line width of a signal wiring formed on the substrate.

8 . The communication control device according to claim 4 , wherein
the first signal path includes a reception signal path for supplying a signal received by the antenna to the communication circuit through the antenna electrode, and a transmission signal path for supplying a signal transmitted from the communication circuit to the antenna through the antenna electrode, and the reception signal path is formed so as to connect the antenna electrode and the communication circuit without passing through the conductive layer other than the first conductive layer.

9 . The communication control device according to claim 4 , wherein the second signal path is formed so as to connect the antenna electrode and the power supply circuit without passing through the conductive layer other than the first conductive layer.

10 . The communication control device according to claim 4 , wherein
the first signal path includes a matching circuit for matching impedance between the antenna and the communication circuit, the matching circuit is configured to include a capacitive element, the mounting board includes an electrode for connecting the capacitive element and a variable capacitor in parallel, the capacitive element is disposed on the first conductive layer, and the electrode for the connection of the variable capacitor is formed on a third conductive layer constituting a second principal surface facing the first principal surface.

11 . The communication control device according to claim 10 , wherein the matching circuit is disposed on the transmission signal path.

12 . The communication control device according to claim 4 , wherein
the first signal path includes a switch circuit that switches between connection and disconnection between the antenna electrode and the communication circuit, and the switch circuit connects the antenna electrode and the communication circuit to each other in case that the communication circuit performs communication through the antenna, and disconnects the antenna electrode and the communication circuit from each other in case that the power supply circuit generates a DC voltage on the basis of an AC signal received by the antenna.

13 . The communication control device according to claim 7 , wherein the second ground pattern has a slit formed in a region interposed between the reception signal path and the transmission signal path when seen in a plan view.

14 . The communication control device according to claim 4 , wherein
the DC/DC converter includes a coil and a semiconductor device for realizing a switching regulator by performing switching control of a current flowing to the coil, a third ground pattern for connection to the ground potential is formed on the second conductive layer so as to overlap at least a portion of the semiconductor device disposed on the first conductive layer when seen in a plan view, and the second ground pattern and the third ground pattern are disposed so as to form a region having no ground pattern in a range overlapping a region in which the coil is disposed, when seen in a plan view.

15 . A communication control device in which an antenna electrode to which an antenna is connected, a power supply circuit which is connected to the antenna electrode, and a communication circuit which is connected to the antenna electrode are mounted on a rectangular mounting board, wherein
the antenna electrode, the power supply circuit, and the communication circuit are disposed on a principal surface of the mounting board along one long side of the principal surface, the communication circuit is disposed on a side of one short side perpendicular to the long side with respect to the antenna electrode, the power supply circuit is disposed on a side of the other short side perpendicular to the long side with respect to the antenna electrode, a first signal path for connecting the antenna electrodes and the communication circuit extends to the side of the one short side along the long side, and a second signal pat

Assignees

• Renesas Electronics Corp

Inventors

• Shibuya Hiroki
• Sasaki Hideki
• Tsukuda Tatsuaki
• Shimizu Tadashi
• Dobashi Masahiro
• Nishizono Shinji
• Kubota Hiroko

Classifications

• H02J50/12 Primary

  of the resonant type · CPC title

• H04B5/0037

  Electricity · mapped topic

• H04B5/0081

  Electricity · mapped topic

• H02J50/80

  involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices · CPC title

• H04B5/79 Primary

  for data transfer in combination with power transfer · CPC title