Antenna and radio frequency module comprising the same

• US 20040001031A1
• Filed: 05/28/2003
• Published: 01/01/2004
• Est. Priority Date: 05/28/2002
• Status: Active Grant

• Current Assignee: NGK Spark PLUG Company Limited
• Original Assignee: NGK Spark PLUG Company Limited
• Inventors: Kanamori, Takashi, Nakata, Daisuke, Sugimoto, Noriyasu, Takada, Toshikatsu, Wakamatsu, Susumu, Otaka, Naoki
• Granted Patent: US 7,071,875 B2
• Time in Patent Office: Days
• US Class Current: 343/895
• CPC Class Codes: H01Q 1/36 Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewithH01Q1/08, H01Q1/14 take precedence
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/371 Branching current paths
• 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 9/30 with feed to end of elongated active element, e.g. unipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/40 Element having extended radiating surface

Abstract

A multiple band antenna comprising: a dielectric substrate; and a plurality of antenna elements being formed of each a conductor on a same face of the dielectric substrate and provided in a one-to-one correspondence with frequency bands to operate the frequency bands, wherein each of the antenna elements has an open end as one end and is connected at an opposite end to a feeder line and comprises a narrow part being placed on a side of the open end and formed by line with a narrow wide and a wide part being placed on a side of the feeder line and having a wider width than the narrow wide of the narrow part, the narrow part is turned in order in substantially the same direction as a width direction of the wide part, to form a meander shape, and the antenna elements have the wide parts joined in one piece forming a predetermined angle with each other so as to share a part of the wide parts.

Claims

1. A multiple band antenna comprising:

a dielectric substrate; and

a plurality of antenna elements being formed of each a conductor on a same face of the dielectric substrate and provided in a one-to-one correspondence with frequency bands to operate the frequency bands, wherein

each of the antenna elements has an open end as one end and is connected at an opposite end to a feeder line and comprises a narrow part being placed on a side of the open end and formed by line with a narrow wide and a wide part being placed on a side of the feeder line and having a wider width than the narrow wide of the narrow part,

the narrow part is turned in order in substantially the same direction as a width direction of the wide part, to form a meander shape, and

the antenna elements have the wide parts joined in one piece forming a predetermined angle with each other so as to share a part of the wide parts.

2. The multiple band antenna according to claim 1, which operates with two frequency bands of a 2.4-GHz band and a 5-GHz band.

3. The multiple band antenna according to claim 1, wherein the predetermined angle is 5°

or more and 50°

or less.

4. The multiple band antenna according to claim 1, wherein the dielectric substrate is a print circuit board for mounting parts.

5. The multiple band antenna according to claim 4, wherein the print circuit board mounts parts for a radio communication device.

6. The multiple band antenna according to claim 1, wherein at least one of the antenna elements is placed almost along a length direction of the dielectric substrate.

7. The multiple band antenna according to claim 1, wherein all of the antenna elements are placed in a slanting position relative to a length direction of the dielectric substrate.

8. The multiple band antenna according to claim 1, wherein each of the antenna elements has a different line length.

9. A radio frequency module for transmitting and receiving a signal, comprising the multiple band antenna according to claim 1.

10. The radio frequency module according to claim 9, which further comprises a switch for switching a signal path in response to transmission or reception.