Dual operational frequency slot antenna
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.
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.