Communication terminal device including a UHF-band RFID system

• US 9,232,034 B2
• Filed: 12/04/2014
• Issued: 01/05/2016
• Est. Priority Date: 10/05/2012
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Dokai, Yuya, Mukai, Tsuyoshi, Nomura, Masato
• Primary Examiner(s): MAUNG, NAY AUNG
• Assistant Examiner(s): Perez, Angelica M
• Application Number:
  US14/560,274
• Publication Number:
  US 20150087362A1
• Time in Patent Office: 397 Days
• Field of Search: 455/575.7, 455/575.1
• US Class Current: 1/1
• CPC Class Codes: G06K 7/10346 the antenna being of the far field type, e.g. HF types or dipoles
• CPC Class Codes: G06K 7/10386 the interrogation device being of the portable or hand-handheld type, e.g. incorporated in ubiquitous hand-held devices such as PDA or mobile phone, or in the form of a portable dedicated RFID reader
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
• CPC Class Codes: H04M 1/026 Details of the structure or mounting of specific components
• CPC Class Codes: H04M 2250/04 including near field communication means, e.g. RFID

Abstract

A communication terminal device includes a UHF-band RFID system including a wireless IC element for UHF-band RFID and a loop-shaped conductor coupled to the wireless IC element for UHF-band RFID, and a UHF-band mobile communication system including a wireless IC element for UHF-band mobile communication and an antenna conductor coupled to the wireless IC element for UHF-band mobile communication. The loop-shaped conductor and the antenna conductor are closely adjacent to each other. The loop-shaped conductor is electromagnetically coupled to a portion of the antenna conductor.

Claims

1. A communication terminal device comprising:

a UHF-band RFID system including a wireless IC element for UHF-band RFID and a loop-shaped conductor coupled to the wireless IC element for UHF-band RFID; and

a UHF-band mobile communication system including a wireless IC element for UHF-band mobile communication and an antenna conductor coupled to the wireless IC element for UHF-band mobile communication;

wherein

the loop-shaped conductor is coupled to a ground conductor provided in a case of the communication terminal device;

the wireless IC element for UHF-band mobile communication is coupled to the ground conductor;

the loop-shaped conductor and the antenna conductor are closely adjacent to each other, and the loop-shaped conductor is electromagnetically coupled to a portion of the antenna conductor;

the loop-shaped conductor is arranged on a feeding portion side of the antenna conductor relative to a longitudinal center of the antenna conductor;

the antenna conductor includes a first radiating portion and a second radiating portion, the second radiating portion being configured to radiate and/or receive a high frequency signal in a frequency band which is different from that of a high frequency signal that the first radiating portion is capable of radiating and/or receiving; and

the loop-shaped conductor is electromagnetically coupled to one of the first radiating portion and the second radiating portion of the antenna conductor which is configured to radiate and/or receive a high frequency signal near a UHF band.

2. The communication terminal device according to claim 1, wherein the wireless IC element for RFID is one of a single wireless IC chip and a wireless IC module including a wireless IC chip and a feeder circuit board.

3. The communication terminal device according to claim 1, wherein the loop-shaped conductor includes a slit that partially divides the loop-shaped conductor.

4. The communication terminal device according to claim 1, wherein the antenna conductor is provided in an inner wall portion of the case.

5. The communication terminal device according to claim 1, wherein the antenna conductor defines a dipole antenna.

6. The communication terminal device according to claim 1, wherein the antenna conductor is a T-branched antenna element.

7. The communication terminal device according to claim 1, wherein the loop-shaped conductor is electromagnetically coupled to a low band portion of the antenna conductor.

8. The communication terminal device according to claim 1, wherein the feeder circuit board includes a filter circuit and a bandwidth expansion circuit.

9. The communication terminal device according to claim 1, wherein the antenna conductor a first end that defines a feeding portion and a second end that defines a ground portion.

10. The communication terminal device according to claim 1, wherein the feeding portion is electrically coupled to the wireless element IC for UHF-band RFID.

11. The communication terminal device according to claim 1, wherein the antenna conductor is a turned-back T-branched antenna element.

12. The communication terminal device according to claim 1, wherein the communication terminal device is one of a phone and a computer.

13. The communication terminal device according to claim 1, wherein the ground conductor is one of a printed wiring board, a metal chassis, and a metal case.

14. The communication terminal device according to claim 1, wherein the loop-shaped conductor includes one of a cutout portion and an opening.

15. A communication terminal device comprising:

a UHF-band RFID system including a wireless IC element for UHF-band RFID and a loop-shaped conductor coupled to the wireless IC element for UHF-band RFID; and

a UHF-band mobile communication system including a wireless IC element for UHF-band mobile communication and an antenna conductor coupled to the wireless IC element for UHF-band mobile communication;

wherein

a portion of the loop-shaped conductor and a portion of the antenna conductor overlap each other when viewed in plan;

the loop-shaped conductor and the antenna conductor are closely adjacent to each other, and the loop-shaped conductor is electromagnetically coupled to a portion of the antenna conductor;

the loop-shaped conductor is arranged on a feeding portion side of the antenna conductor relative to a longitudinal center of the antenna conductor;

the antenna conductor includes a first radiating portion and a second radiating portion, the second radiating portion being configured to radiate and/or receive a high frequency signal in a frequency band which is different from that of a high frequency signal that the first radiating portion is capable of radiating and/or receiving; and

the loop-shaped conductor is electromagnetically coupled to one of the first radiating portion and the second radiating portion of the antenna conductor which is configured to radiate and/or receive a high frequency signal near a UHF band.