Transmission antenna module, non-contact transmission module, non-contact communication system provided therewith and non-contact communication method

Patent metadata

Field	Value
Publication number	US-11956028-B2
Application number	US-202117200123-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Jan 12, 2017
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A module and system are provided for reducing or suppressing ringing occurring in a digital signal to be transmitted. A transmission module Ma includes a transmitter 200 a configured to transmit a digital signal, a transmission antenna 100 a constituted by a metal plate, or by a conductor formed on an insulator, the transmission antenna 100 a being configured to be electromagnetically or magnetically coupled to a reception antenna 100 b of a non-contact reception module Mb for digital communication, and a resistor 400 a connected in series between the transmitter 200 a and the transmission antenna 100 a . The resistor 400 a has such a resistance value that the resistor 400 a entirely blunts a waveform of the digital signal outputted from the transmitter 200 a so as to reduce or suppress ringing occurring in the digital signal. The blunted digital signal is to be inputted into the transmission antenna 100 a.

First claim

What is claimed is:

1. A non-contact transmission module comprising:
a transmission antenna module; and
a transmitter configured to transmit a digital signal containing high frequency components of a plurality of hundred MHz or higher,
wherein the transmission antenna module includes
a transmission antenna constituted by a metal plate, or by a conductor formed on an insulator, the transmission antenna being configured to be electromagnetically or magnetically coupled to a reception antenna of a non-contact reception module, wherein a distance between the transmitter and the transmission antenna is between a plurality of millimeters and 200 millimeters, and
at least one resistor connected in series between the transmission antenna and the transmitter, the at least one resistor having such a resistance value that the at least one resistor attenuates, over the entire frequency range, frequency components of the digital signal to be inputted into the at least one resistor so as to reduce or suppress ringing occurring in the digital signal,

wherein the transmission antenna module is configured to input the digital signal with the frequency components thereof attenuated over the entire frequency range, directly into the transmission antenna from the at least one resistor, and
wherein the resistance value of the at least one resistor is between several ohms and hundreds of ohms.

2. The non-contact transmission module according to claim 1 , wherein
the transmitter includes a first port and a second port,
the transmission antenna includes a first portion and a second portion,
the at least one resistor comprises a plurality of the resistors including at least one first resistor and at least one second resistor,
the at least one first resistor is connected in series between the first port of the transmitter and the first portion of the transmission antenna, and
the at least one second resistor is connected in series between the second port of the transmitter and the second portion of the transmission antenna.

3. The non-contact transmission module according to claim 1 , wherein the transmitter is configured to output a single-ended signal.

4. The non-contact transmission module according to claim 2 , wherein the transmitter is configured to output a single-ended signal.

5. A non-contact communication system comprising:
the non-contact transmission module according to claim 1 ; and
a non-contact reception module configured to perform non-contact digital communication with the non-contact transmission module, wherein
the transmitter includes a first port and a second port,
the transmission antenna includes a first portion and a second portion,
the at least one resistor comprises a plurality of the resistors including at least one first resistor and at least one second resistor,
the at least one first resistor is connected in series between the first port of the transmitter and the first portion of the transmission antenna,
the at least one second resistor is connected in series between the second port of the transmitter and the second portion of the transmission antenna,
the digital signal comprises differential signals,
the transmitter is configured to output a positive signal of the differential signals from the first port and output a negative signal of the differential signals from the second port,
the at least one first resistor has such the resistance value that the at least one first resistor entirely blunts the waveform of the positive signal so as to reduce or suppress ringing occurring in the positive signal outputted from the first port, and
the at least one second resistor has such the resistance value that the at least one second resistor entirely blunts the waveform of the negative signal so as to reduce or suppress ringing occurring in the negative signal outputted from the second port,

and wherein the non-contact reception module includes
a reception antenna configured to be electromagnetically or magnetically coupled to the transmission antenna of the non-contact transmission module to induce a reception signal corresponding to at least part of the blunted digital signal, and
a restorer configured to restore the induced reception signal to the digital signal.

6. A non-contact communication system comprising:
the non-contact transmission module according to claim 1 ; and
a non-contact reception module configured to perform non-contact digital communication with the non-contact transmission module,
wherein the transmitter is configured to output a single-ended signal, and
wherein the non-contact reception module includes
a reception antenna configured to be electromagnetically or magnetically coupled to the transmission antenna of the non-contact transmission module to induce a reception signal corresponding to at least part of the attenuated digital signal, and
a restorer configured to restore the induced reception signal to the digital signal.

7. A non-contact transmission method comprising: applying a digital signal to at least one resistor having a resistance value and thereby entirely attenuating, over the entire frequency range, frequency components of the digital signal so as to reduce or suppress ringing occurring in the digital signal, wherein the at least one resistor is connected in series to a transmission antenna and the transmission antenna is configured to be electromagnetically or magnetically coupled to a reception antenna of a non-contact reception module; and inputting the digital signal, with the frequency components thereof attenuated over the entire frequency range, directly into the transmission antenna from the at least one resistor, wherein the resistance value of the at least one resistor is between several ohms and hundreds of ohms, the applying of the digital signal includes applying the digital signal, which has been transmitted from a transmitter and contains high frequency components of a plurality of hundred MHz or higher, to the at least one resistor, and a distance between the transmitter and the transmission antenna is between a plurality of millimeters and 200 millimeters.

8. The non-contact communication method according to claim 7 , wherein
the inputting of the digital signal into the transmission antenna includes electromagnetically or magnetically coupling a transmission antenna of the non-contact transmission module and a reception antenna of the non-contact reception module, wherein the transmission antenna is constituted by a metal plate or by a conductor formed on an insulator of the non-contact transmission module.

Assignees

• Hosiden Corp
• Univ Keio

Inventors

• Kondo Hayato
• Sasada Kosuke
• Kuroda Tadahiro

Classifications

• H04B5/24 Primary

  Inductive coupling · CPC title

• H04B5/48 Primary

  Transceivers · CPC title

• H04B1/59 Primary

  Responders; Transponders · CPC title