Dual operational frequency slot antenna

• US 20050088354A1
• Filed: 11/02/2004
• Published: 04/28/2005
• Est. Priority Date: 09/15/2003
• Status: Active Grant

• Current Assignee: Tatung Company, Tatung University
• Original Assignee: Tatung Co., Ltd.
• Inventors: Chang, The-Nan
• Granted Patent: US 7,006,048 B2
• Time in Patent Office: Days
• US Class Current: 343/767
• 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 13/16 Folded slot antennas
• CPC Class Codes: H01Q 5/357 using a single feed point

Abstract

A dual operational frequency slot antenna for receiving/transmitting wireless signals from a satellite or for receiving/transmitting wireless signals in an RFID system comprises two L-type slot antennas and a printed circuit feed line to receive and transmit circularly polarized radiation at dual operational frequencies.

Claims

1. A dual operational frequency slot antenna for receiving/transmitting wireless signals from a satellite or for receiving/transmitting wireless signals in an RFID system, comprising:

a F-type slot antenna for receiving and transmitting a wireless signal at a first working frequency and a wireless signal at a second working frequency; and

a feed line for receiving and transmitting the wireless signals at the first working frequency and the second working frequency;

wherein

the F-type slot antenna is consisted of two L-type slot antennas, and the feed line is a metal line and made of printed circuit.

2. The dual operational frequency slot antenna as claimed in claim 1, wherein the feed line is connected to a first feed line and a second feed line.

3. The dual operational frequency slot antenna as claimed in claim 2, wherein the first working frequency is 900 MHz and the second working frequency is 2450 MHz.

4. The dual operational frequency slot antenna as claimed in claim 2, wherein the first working frequency is 1227 MHz and the second working frequency is 1575 MHz.

5. The dual operational frequency slot antenna as claimed in claim 1, wherein a lower face of the F-type slot antenna is metallic.