Antenna and electronic device equipped with the same

• US 8,537,052 B2
• Filed: 01/29/2010
• Issued: 09/17/2013
• Est. Priority Date: 02/24/2009
• Status: Expired due to Fees

• Current Assignee: Fujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
• Original Assignee: Fujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
• Inventors: Furutani, Nagahisa, Kai, Manabu, Nogami, Satoru
• Primary Examiner(s): LE, HOANGANH T
• Application Number:
  US12/696,527
• Publication Number:
  US 20100214188A1
• Time in Patent Office: 1,327 Days
• Field of Search: 343/700.MS, 343/702, 343/846
• US Class Current: 343/700.MS
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 9/0407 Substantially flat resonant element parallel to ground plane, e.g. patch antenna dipole H01Q9/285; monopole H01Q9/40
• CPC Class Codes: H01Q 9/065 Microstrip dipole antennas patch antenna H01Q9/0407
• CPC Class Codes: H01Q 9/285 Planar dipole H01Q9/065 takes precedence; patch antenna H01Q9/0407

Abstract

An antenna includes a dielectric substrate, a ground electrode provided on a first surface of the dielectric substrate, a first antenna element and a second antenna elements provided to a second surface of the dielectric substrate, the first and second antenna elements having an identical resonance frequency and an identical Q value, a transmission line connecting the first and second antenna elements, and a feed part provided in the transmission line.

Claims

1. An antenna comprising:

a dielectric substrate;

a ground electrode provided on a first surface of the dielectric substrate;

a first antenna element and a second antenna element provided to a second surface of the dielectric substrate, the first antenna element having rectangular shape, the second antenna element having rectangular shape and placed opposite to the first antenna element, each of the first and second antenna element connected to the ground electrode via an electrode provided on an end of the dielectric substrate, each of the first and second antenna element having a short-circuited end and an open-circuited end, each of the first and second antenna element having shape so that a resonance frequency and a Q value of the first antenna element are same as those of the second antenna element;

a transmission line connecting a side of each of the first antenna element and the second antenna element, the side of the first antenna element and the side of the second antenna element are located between the short-circuited end and the open-circuited end respectively, and are placed opposite with respect to one another; and

a feed part provided in the transmission line.

2. An electronic device comprising:

a dielectric substrate;

a ground electrode provided on a first surface of the dielectric substrate;

a first antenna element and a second antenna element provided to a second surface of the dielectric substrate, the first antenna element having rectangular shape, the second antenna element having rectangular shape and placed opposite to the first antenna element, each of the first and second antenna element connected to the ground electrode via an electrode provided on an end of the dielectric substrate, each of the first and second antenna element having a short-circuited end and an open-circuited end, each of the first and second antenna element having shape so that a resonance frequency and a Q value of the first antenna element are same as those of the second antenna element;

a transmission line connecting a side of each of the first antenna element and the second antenna element, the side of the first antenna element and the side of the second antenna element are located between the short-circuited end and the open-circuited end respectively, and are placed opposite with respect to one another;

a feed part provided in the transmission line; and

a circuit chip provided on the dielectric substrate and connected to the feed part.