Radio data transmitter and receiver

• US 5,995,806 A
• Filed: 03/19/1997
• Issued: 11/30/1999
• Est. Priority Date: 03/22/1996
• Status: Expired due to Fees

• Current Assignee: Kazuo Tsubouchi
• Original Assignee: Kazuo Tsubouchi
• Inventors: Tsubouchi, Kazuo, Azuma, Toshiyuki, Hozumi, Jun
• Primary Examiner(s): Loomis, Paul
• Assistant Examiner(s): TIEU, BINH KIEN
• Application Number:
  US08/823,392
• Time in Patent Office: 986 Days
• Field of Search: 455/38.2, 455/38.3, 455/38.5, 455/39, 455/343, 379/106.03, 379/106.04, 379/106.07, 379/106.11, 340/825.06, 340/825.44, 340/825.47, 340/825.54, 340/870.02, 340/870.03, 340/870.11, 340/870.41
• US Class Current: 455/39
• CPC Class Codes: G08C 17/02 using a radio link

Abstract

A radio data transmitter includes radio switching circuit which is activated in response to first radio signal having a predetermined particular pattern, and a data transmitter unit. The data unit transmits a first radio signal include a carrier modulated by predetermined data from an antenna when supplied with power in accordance with the activation of the radio switching circuit, and subsequently disconnect the power supply. In addition, a radio data receiver includes switch-activation to circuit for transmitting the first radio signal having the predetermined particular pattern, a receiving circuit for receiving the second radio signal including the data from the data transmitter unit activated by the first radio signal having the predetermined particular pattern, and a storage device for storing data received by the receiving circuit.

Claims

1. A radio data transmitter comprising:

a radio switching means including;

a receiving antenna for receiving a first radio signal;

said first radio signal comprising a predetermined particular pattern;

a surface acoustic wave device for extracting said particular pattern in said first radio signal received by said receiving antenna;

an accumulation circuit for generating an output power accumulated from said surface acoustic wave device; and

a switching circuit, activated when said output power from said accumulation circuit exceeds a predetermined value, wherein said accumulation circuit is activated in response to said first radio signal;

a data transmitter unit which is supplied with power in accordance with the activation of the radio switching means;

wherein said data transmitter unit transmits a second radio signal comprising predetermined carrier-modulated data from a transmitting antenna and subsequently power is disconnected to said data transmitter unit.

2. A radio data transmitter according to claim 1, wherein said surface acoustic wave device comprises a surface acoustic wave matched filter.

3. A radio data transmitter according to claim 2, wherein said comprises an Al₂ O₃ substrate, an AlN film formed on said Al₂ O₃ substrate, and an Al tapping pattern formed on said AlN film.