Planar inverted-F antenna

• US 7,482,978 B2
• Filed: 05/03/2006
• Issued: 01/27/2009
• Est. Priority Date: 08/12/2005
• Status: Expired due to Fees

• Current Assignee: Advanced-Connectek Incorporated (ACON Holding, Inc.)
• Original Assignee: Advanced-Connectek Incorporated (ACON Holding, Inc.)
• Inventors: Chen, Chin-Fan, Yang, Mei-Chin, Hsiao, Fu-Ren, Chiu, Tsung-Wen
• Primary Examiner(s): Ho; Tan
• Application Number:
  US11/416,235
• Publication Number:
  US 20070035451A1
• Time in Patent Office: 1,000 Days
• Field of Search: 343/700.MS, 343/702, 343/767, 343/846
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 5/371 Branching current paths
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/0442 with particular tuning means
• CPC Class Codes: H01Q 9/145 by varying the electrical length

Abstract

A PIFA in one embodiment includes a radiating member including a feed point, a shorting point, a first radiating element having a starting point and a terminating point coiled as a longer path terminated at an outer edge of a ground plane and being open for generating a resonance mode having a low frequency, and a second radiating element having a starting point connected to the starting point of the first radiating element, and a terminating point extended to form a shorter path terminated at the outer edge of the ground plane, the terminating points of the first and second radiating elements adjacent for generating a resonance mode having a high frequency; low and high frequency medium frequency regulators for adjusting resonance frequencies of two different resonance modes a substrate; a feed member; and a shorting member.

Claims

1. A PIFA (planar inverted-F antenna) comprising:

a ground plane (31);

a radiating member (30) including a feed point (301), a shorting point (302), a first radiating element (303) having a first starting point proximate the feed point (301) and the shorting point (302), and a first terminating point coiled as a longer path (304) terminated at an outer edge of the ground plane (31) and being open for generating a first resonance mode having a low frequency, and a second radiating element (305) having a second starting point connected to the first starting point of the first radiating element (303), and a second terminating point extended toward the first terminating point of the first radiating element (303) to form a shorter path (306) terminated at the outer edge of the ground plane (31), the second terminating point of the second radiating element (305) being proximate the first terminating point of the first radiating element (303) for generating a second resonance mode having a high frequency;

a low frequency medium frequency regulator (32) located at the first terminating point of the first radiating element (303) and being perpendicular to the ground plane (31) for adjusting a resonance frequency of the first resonance mode having a low frequency;

a high frequency medium frequency regulator (33) located at the second terminating point of the second radiating element (305) and being perpendicular to the ground plane (31) for adjusting a resonance frequency of the second resonance mode having a high frequency;

a substrate (34);

a feed member (35) having one end connected to the feed point (301) of the radiating member (30) and the other end connected to a signal source for signal transmission; and

a shorting member (36) having one end connected to the ground plane (31) and the other end connected to the shorting point (302) of the second radiating element (305).

2. The PIFA of claim 1, wherein the low frequency medium frequency regulator (32) has a dielectric constant in a range of 10 and 150.

3. The PIFA of claim 1, wherein the high frequency medium frequency regulator (33) has a dielectric constant in a range of (10) and (150).

4. The PIFA of claim 1, wherein the substrate (34) is a microwave dielectric member.

5. The PIFA of claim 1, wherein the first radiating element (303) and the second radiating element (305) are located at two different planes.

6. The PIFA of claim 5, wherein the second radiating element (305) is at the outer edge of the ground plane (31).