Transceiver and radio frequency identification tag reader

• US 9,460,320 B2
• Filed: 04/03/2012
• Issued: 10/04/2016
• Est. Priority Date: 10/27/2009
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Sakai, Ken, Ieki, Tsutomu, Kato, Noboru, Shiroki, Koji
• Primary Examiner(s): Kim, Wesley
• Assistant Examiner(s): CHAKRABORTY, RAJARSHI
• Application Number:
  US13/437,978
• Publication Number:
  US 20120190310A1
• Time in Patent Office: 1,645 Days
• Field of Search: 455/73, 455/80, 455/126, 455/269, 455/572, 343/730, 343/848
• US Class Current: 1/1
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10316 using at least one antenna particularly designed for interrogating the wireless record carriers antennas in general H01Q1/22
• CPC Class Codes: H01Q 1/2283 mounted in or on the surface of a semiconductor substrate as a chip-type antenna or integrated with other components into an IC package
• CPC Class Codes: H01Q 25/001 Crossed polarisation dual antennas orthomode horns H01Q13/0258; cross-polarised rear feeds H01Q19/136; orthomode transducers H01P1/161

Abstract

In a transceiver, on a top surface of a rectangular plate-shaped substrate, transmission radiating elements and receiving radiating elements are provided. The transmission radiating elements extend in the horizontal or lateral direction from the center of the substrate. The receiving radiating elements extend in the vertical or longitudinal direction from the center of the substrate. Inductors included in a matching feeding element are individually electromagnetically coupled to transmission-side feeding points that are inner end portions of the transmission radiating elements and receiving-side feeding points that are inner end portions of the receiving radiating elements. A transmission signal is transmitted with a wave polarized in the horizontal or lateral direction, and a signal having a vertical or longitudinal polarization direction is received.

Claims

1. A transceiver comprising:

a transmission radiating element including a feeding point and arranged to transmit a transmission signal in a first polarization direction;

a receiving radiating element including a feeding point and arranged to receive a receiving signal in a second polarization direction orthogonal or substantially orthogonal to the first polarization direction;

a transmission feeding circuit coupled to the feeding point of the transmission radiating element;

a receiving feeding circuit coupled to the feeding point of the receiving radiating element;

a transmission circuit configured to supply a transmission signal to the transmission feeding circuit; and

a receiving circuit configured to receive a receiving signal via the receiving feeding circuit;

wherein

the transmission radiating element and the receiving radiating element are disposed on a surface of a substrate or in an inner layer of the substrate, and arranged in a common plane or in adjacent planes that are parallel or substantially parallel to one another and parallel or substantially parallel to an upper surface of the substrate;

the transmission radiating element and the receiving radiating element overlap each other in a plan view; and

the transmission radiating element is fixed so as to transmit the transmission signal while the receiving radiating element is fixed so as to receive the receiving signal.

2. The transceiver according to claim 1, wherein the feeding point of the transmission radiating element and the transmission feeding circuit are electromagnetically coupled to each other, and the feeding point of the receiving radiating element and the receiving feeding circuit are electromagnetically coupled to each other.

3. The transceiver according to claim 1, further comprising a transmission matching circuit connected to the transmission feeding circuit;

wherein

the transmission radiating element, the transmission feeding circuit, and the transmission matching circuit define a transmission antenna apparatus; and

a frequency band in which a gain of the transmission antenna apparatus is obtained is determined by the transmission matching circuit.

4. The transceiver according to claim 1, further comprising a receiving matching circuit connected to the receiving feeding circuit;

wherein

the receiving radiating element, the receiving feeding circuit, and the receiving matching circuit define a receiving antenna apparatus; and

a frequency band in which a gain of the receiving antenna apparatus is obtained is determined by the receiving matching circuit.

5. The transceiver according to claim 1, wherein the transmission radiating element and the transmission feeding circuit define a transmission antenna apparatus, and a frequency band in which a gain of the transmission antenna apparatus is obtained is determined by the transmission feeding circuit.

6. The transceiver according to claim 1, wherein the receiving radiating element and the receiving feeding circuit define a receiving antenna apparatus, and a frequency band in which a gain of the receiving antenna apparatus is obtained is determined by the receiving feeding circuit.

7. The transceiver according to claim 1, wherein the transmission radiating element and the receiving radiating element are electric field emission-type radiating elements.

8. The transceiver according to claim 7, wherein the transmission radiating elements define a dipole antenna including two feeding points, and the receiving radiating elements define a dipole antenna including two feeding points, and the transmission radiating elements and the receiving radiating elements are disposed so that the transmission radiating elements and the receiving radiating elements radially extend from the feeding points.

9. The transceiver according to claim 1, wherein one of the transmission radiating element and the receiving radiating element is an electric field emission-type radiating element, and the other one of the transmission radiating element and the receiving radiating element is a magnetic field emission-type radiating element.

10. The transceiver according to claim 1, wherein the transmission radiating element and the receiving radiating element are magnetic field emission-type radiating elements.

11. The transceiver according to claim 10, wherein the transmission radiating element and the receiving radiating element are loop-shaped antennas located at a substrate, and one of the transmission radiating element and the receiving radiating element defines a loop along with a via electrode provided in the substrate.

12. A radio frequency identification tag reader comprising:

the transceiver according to claim 1;

a transmission signal generator configured to generate the transmission signal; and

a receiving signal processor configured to acquire from the receiving signal information about a radio frequency identification tag that is a communication target of the transceiver and includes an integrated circuit to store information and an antenna to transmit information stored in the integrated circuit or to receive information to be stored in the integrated circuit.

13. The transceiver according to claim 1, wherein the transmission radiating element and the receiving radiating element are configured to operate as dipole antennas.

14. The transceiver according to claim 1, wherein one of the transmission radiating element and the receiving radiating element is configured to operate as a dipole antenna, and another of the transmission radiating element and the receiving radiating element is configured to operate as a loop antenna.

15. The transceiver according to claim 1, wherein the transmission radiating element and the receiving radiating element are configured to operate as loop antennas.