Wireless communication apparatus

{
  "publication_number": "US10992280B2",
  "country": "US",
  "kind": "B2",
  "title": "Wireless communication apparatus",
  "abstract": "A wireless communication apparatus which comprises: a shared antenna shared for communication and power reception; an impedance matching circuit connected to the shared antenna and having a first switch element; a communication circuit connected to the impedance matching circuit; a second switch element connected to the first switch element; and an impedance matching adjustment circuit configured to switch an on/off state of each of the first switch element and the second switch element at the time of communication and at the time of power reception.",
  "claims": [
    "1. A wireless communication apparatus comprising: a shared antenna shared for communication and power reception; an impedance matching circuit connected to said shared antenna and having a first switch element; a communication circuit connected to said impedance matching circuit; a second switch element connected to said first switch element; and an impedance matching adjustment circuit configured to switch an on/off state of each of said first switch element and said second switch element at the time of communication and at the time of power reception.",
    "2. The wireless communication apparatus according to claim 1, further comprising: a rectifier circuit connected to said impedance matching circuit; an auxiliary power receiving antenna; an auxiliary impedance matching circuit connected to said auxiliary power receiving antenna; and an auxiliary rectifier circuit connected to said auxiliary impedance matching circuit, and configured to supply electric power to said first switch element.",
    "3. The wireless communication apparatus according to claim 1, further comprising a rectifier circuit connected to said impedance matching circuit, and configured to supply electric power to said first switch element."
  ],
  "description_excerpt": "The present invention relates to a wireless communication apparatus for performing communication and power reception in a non-contact manner.\n\nThere is known a communication apparatus which includes non-contact transmitting and receiving devices, and which operates under the Qi standard (which is a wireless power transfer standard developed by WPC (Wireless Power Consortium)) using a frequency band of 110 kHz to 205 kHz. Further, there are also known NFC (Near Field Communication) standards used for short-range communication. Recently, a mobile communication apparatus (hereinafter referred to as an NFC apparatus) such as an NFC earphone or an NFC touch pen has been developed by taking advantage of the advantage that an antenna can be miniaturized by NFC using a frequency (13.56 MHz band) higher than the frequency band used for Qi. Power is supplied to the mobile communication apparatus by NFC to charge a battery (see Japanese Patent Kokai No. 2017-538377). In addition, there has been already developed an antenna automatic adjustment apparatus which changes a frequency and a circuit constant according to an impedance change (see Japanese Patent Kokai No. 2011-217212).\n\nIn the mobile communication apparatus, the transmitting device uses a battery (secondary battery). Therefore, there is a strong demand to extend the operation time of the battery of the transmitting device by lowering the transmission power at the time of communication.",
  "cpc": [
    "H03H 7/38",
    "H01Q 7/00",
    "H02J 50/12",
    "H02J 50/20",
    "H02J 50/40",
    "H02J 50/80",
    "H02J 7/02",
    "H04B 1/0458",
    "H04B 1/40",
    "H04B 5/0037",
    "H04B 5/26",
    "H04B 5/263",
    "H04B 5/48",
    "H04B 5/70",
    "H04B 5/79"
  ],
  "ipc": [
    "H02J 50/12",
    "H02J 50/20",
    "H02J 50/40",
    "H02J 50/80",
    "H02J 7/02",
    "H03H 7/38",
    "H04B 1/40",
    "H04B 5/48"
  ],
  "assignees": [
    "Lapis Semiconductor Co Ltd"
  ],
  "inventors": [
    "Yutaka Mimino"
  ],
  "filing_date": "2020-03-25",
  "publication_date": "2021-04-27",
  "grant_date": "2021-04-27",
  "priority_date": "2019-03-26",
  "application_number": "US-202016830237-A",
  "family_id": "72607401",
  "cited_by_count": 3,
  "citations": [
    "US9673660B2",
    "US8410637B2",
    "JP2011217212A",
    "US20150065041A1",
    "US9991731B2",
    "US10079514B2",
    "JP2017538377A",
    "US10778039B2"
  ]
}