Dual band antenna
A dual band antenna includes a first linear periodic array of first individual antennas for a first frequency band and a second linear periodic array of second individual antennas for a second frequency band. The period of the first linear periodic array is essentially twice as large as the period of the second linear periodic array. The second individual antennas are arranged alternately between the first and above the first individual antennas. The first individual antennas and the second individual antennas are embodied as patch radiators. The first and second individual antennas each include a printed-circuit board arranged in a rectangular, electrically conducting box which is open towards the top in addition to several patch plates which are arranged at a distance on top of each other above the printed-circuit board and parallel to the printed-circuit board.
1. A dual-band antenna comprising a first linear periodic array of first individual antennas for a first frequency band and a second linear periodic array of second individual antennas for a second frequency band, the period of the first linear periodic array being essentially twice as large as the period of the second linear periodic array, the second individual antennas being arranged alternately between the first and above the first individual antennas, and the first individual antennas and second individual antennas being constructed as patch radiators, wherein each first and second individual antennas includes a printed-circuit board arranged in a rectangular, electrically conductive box open to the top and a number of patch plates which are arranged at a distance above one another above the printed-circuit board and in parallel with the printed-circuit board.
2. The dual-band antenna as claimed in claim 1 , wherein the patch plates of each individual antenna are held in each case at a distance above one another and from the printed-circuit board by means of electrically insulating spacing elements.
3. The dual-band antenna as claimed in claim 2 , wherein each second individual antenna includes three patch plates arranged at a distance above one another, and each first individual antenna includes two patch plates arranged a distance above one another with a box of one of the second individual antenna arranged at a distance above the top one of said two patch plates.
4. The dual-band antenna as claimed in claim 2 , wherein the first and second individual antennas are arranged above a common base plate extending in the longitudinal direction of the antenna.
5. The dual-band antenna as claimed in claim 2 , wherein the first individual antennas are designed for covering the frequency range of 806–960 MHz and the second individual antennas are designed for covering the frequency range of 1710–2170 MHz.
6. The dual-band antenna as claimed in claim 2 , wherein a total of N first individual antennas and 2N±1 second individual antennas are arranged in the dual-band antenna, where N=integral number>0.
7. The dual-band antenna as claimed in claim 1 , wherein each second individual antenna includes three patch plates arranged at a distance above one another, and each first individual antenna includes two patch plates arranged a distance above one another with a box of one of the second individual antenna arranged at a distance above the top one of said two patch plates.
8. The dual-band antenna as claimed in claim 7 , wherein the first and second individual antennas are arranged above a common base plate extending in the longitudinal direction of the antenna.
9. The dual-band antenna as claimed in claim 7 , wherein the first individual antennas are designed for covering the frequency range of 806–960 MHz and the second individual antennas are designed for covering the frequency range of 1710–2170 MHz.
10. The dual-band antenna as claimed in claim 7 , wherein a total of N first individual antennas and 2N±1 second individual antennas are arranged in the dual-band antenna, where N=integral number>0.
11. The dual-band antenna as claimed in claim 1 , wherein the first and second individual antennas are arranged above a common base plate extending in the longitudinal direction of the antenna.
12. The dual-band antenna as claimed in claim 11 , wherein the base plate is constructed as a reflector.
13. The dual-band antenna as claimed in claim 12 , wherein the first individual antennas are designed for covering the frequency range of 806–960 MHz and the second individual antennas are designed for covering the frequency range of 1710–2170 MHz.
14. The dual-band antenna as claimed in claim 12 , wherein a total of N first individual antennas and 2N±1 second individual antennas are arranged in the dual-band antenna, where N=integral number>0.
15. The dual-band antenna as claimed in claim 11 , wherein the first individual antennas are designed for covering the frequency range of 806–960 MHz and the second individual antennas are designed for covering the frequency range of 1710–2170 MHz.
16. The dual-band antenna as claimed in claim 11 , wherein a total of N first individual antennas and 2N±1 second individual antennas are arranged in the dual-band antenna, where N=integral number>0.
17. The dual-band antenna as claimed in claim 1 , wherein the first individual antennas are designed for covering the frequency range of 806–960 MHz and the second individual antennas are designed for covering the frequency range of 1710–2170 MHz.
18. The dual-band antenna as claimed in claim 17 , wherein a total of N first individual antennas and 2N±1 second individual antennas are arranged in the dual-band antenna, where N=integral number>0.
19. The dual-band antenna as claimed in claim 1 , wherein a total of N first individual antennas and 2N±1 second individual antennas are arranged in the dual-band antenna, where N=integral number>0.
20. The dual-band antenna as claimed in claim 19 , wherein N=7.