MINIATURE MULTI-FREQUENCY ANTENNA

• US 20110095947A1
• Filed: 09/22/2010
• Published: 04/28/2011
• Est. Priority Date: 10/23/2009
• Status: Active Grant

• Current Assignee: Unictron Technologies Corp.
• Original Assignee: Unictron Technologies Corp.
• Inventors: CHOU, Chih-Shen
• Granted Patent: US 9,030,358 B2
• Time in Patent Office: Days
• US Class Current: 343/700.0MS
• 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

Abstract

A miniature multi-frequency antenna, comprising at least one dielectric substrate, at least one signal electrode and at least one ground electrode. The signal electrode and the ground electrode are disposed on a substrate. The signal electrode contains at least two branches and at least one branch is partially overlapped with the ground electrode. Each interlayer region between the partially overlapped electrodes forms a specific capacitance. By utilizing this interlayer capacitive effect, the resonant frequency of lower frequency band is achieved while the size of the antenna is effectively reduced. For obtaining the resonant frequency of the high frequency bands, the design concept of PIFA is applied on other branches of the signal electrode. A miniature antenna thus obtained is capable of transmitting/receiving multi-frequency signals having the benefits of easily adjusting impedance and resonant frequency.

Claims

1. A miniature multi-frequency antenna which is capable of transmitting and receiving signals and is connected to at least one signal feed line and at least one ground line, comprising:

at least one dielectric substrate;

at least one signal electrode, is disposed on said substrate and is connected to said signal feed line, said signal electrode comprises at least two branches; and

at least one ground electrode, is disposed on said substrate and is connected to said ground line, said ground electrode is partially overlapped with at least one branch of said signal electrode.

2. The miniature multi-frequency antenna as claimed in claim 1, wherein said miniature multi-frequency antenna is incorporated and manufactured integrally with a circuit board directly, wherein

said circuit board, with a prearranged clearance region having said signal electrode and said ground electrode being disposed within, is formed of a board and a circuit, and said board is being treated as said substrate.

3. The miniature multi-frequency antenna as claimed in claim 2, wherein

said board comprises a plurality of board units, wherein said branches of said signal electrode and said ground electrode are disposed between said board units or on the surfaces of said board;

said signal electrode and said ground electrode are separated by a spacing of at least the thickness of one said board unit.

4. The miniature multi-frequency antenna as claimed in claim 2, wherein

a plurality of said signal electrodes are disposed respectively between said board units or on the surfaces of said board.

5. The miniature multi-frequency antenna as claimed in claim 4, wherein

said board further comprises at least one through hole penetrating through said board units to connect with said signal electrodes.

6. The miniature multi-frequency antenna as claimed in claim 2, wherein a plurality of said ground electrodes are disposed respectively between said board units or on the surfaces of said board.

7. The miniature multi-frequency antenna as claimed in claim 6, wherein

said board further comprises at least one through hole penetrating through said board units, thus achieving connection of said ground electrodes.

8. The miniature multi-frequency antenna as claimed in claim 1, wherein

said at least one signal electrode is connected with said signal feed line and with said ground line.

9. The miniature multi-frequency antenna as claimed in claim 1, wherein

said substrate is made of ceramic material, glass material, magnetic material, polymeric material, or a composite of the above mentioned.

10. The miniature multi-frequency antenna as claimed in claim 1, wherein a carrier substrate is further disposed between said substrate and a circuit board in which both said signal feed line and said ground line are disposed on. The carrier substrate has at least two connection electrodes disposed on for the connection of said signal electrode with said signal feed line and the connection of said ground electrode with said ground line, respectively.

11. The miniature multi-frequency antenna as claimed in claim 10, wherein said signal electrode is connected with said signal feed line and with said ground line.