Antenna device
View Patent ↗An antenna device for a radio communication device, preferably a portable radio communication device, comprising a first antenna element ( 20 ) comprising a first feeding portion ( 22 ) connected to a first feeding device ( 24 ), a second antenna element ( 30; 230; 330; 430; 530; 630 ) comprising second feeding portions ( 32, 33; 332, 333 ) connected to a second feeding device ( 34 ), wherein said first antenna element ( 20 ) has an unbalanced feed, and said second antenna element ( 30; 230; 330; 430; 530; 630 ) has an essentially balanced feed.
1. An antenna device for a portable radio communication device, said antenna device comprising
a first antenna element comprising a first feeding portion connected to a first feeding device,
a second antenna element comprising second feeding portions connected to a second feeding device, wherein
said first antenna element has an unbalanced feed and is positioned spaced apart from a ground plane and essentially parallel thereto,
said second antenna element has an essentially balanced feed, and
said second antenna element is a loop antenna.
2. The antenna device according to claim 1 , wherein said first antenna element is adapted for transmitting radio signals and said second antenna element is adapted for receiving radio signals.
3. The antenna device according to claim 1 , wherein both said first and said second antenna element are adapted for transmitting radio signals.
4. The antenna device according to claim 1 , wherein both said first and said second antenna element are adapted for receiving and transmitting radio signals.
5. The antenna device according to claim 1 , wherein both said first and said second antenna element is are adapted for receiving radio signals.
6. The antenna device according to claim 1 , wherein said first antenna element is adapted for receiving radio signals and said second antenna element is adapted for transmitting radio signals.
7. The antenna device according to claim 1 , wherein said first antenna element is adapted for receiving radio signals and said second antenna element is adapted for receiving and transmitting radio signals.
8. The antenna device according to claim 1 , wherein said first antenna element is adapted for receiving and transmitting radio signals and said second antenna element is adapted for transmitting radio signals.
9. The antenna device according to claim 1 , wherein said first antenna element is adapted for transmitting radio signals and said second antenna element is adapted for receiving and transmitting radio signals.
10. The antenna device according to claim 1 , wherein said first antenna element is adapted for receiving and transmitting radio signals and said second antenna element is adapted for receiving radio signals.
11. The antenna device according to claim 1 , wherein said first antenna element is selected from the group consisting of: PIFA, Patch, modified PIFA, meander PIFA, and slot.
12. The antenna device according to claim 1 , wherein said second antenna element is positioned in a plane essentially parallel to said first antenna element.
13. The antenna device according to claim 1 , wherein said second antenna element is positioned in a plane essentially perpendicular to said first antenna element.
14. The antenna device according to claim 1 , wherein said second antenna element essentially surrounds said first antenna element.
15. The antenna device according to claim 1 , wherein said second feeding device comprises a balanced filter, inputs of which are arranged to receive signals from said second feeding portions, and a balanced amplifier the inputs of which are arranged to receive signals from outputs of said balanced filter.
16. The antenna device according to claim 15 , wherein said balanced amplifier is a low noise amplifier, preferably provided by ASIC technology.
17. The antenna device according to claim 1 , wherein said first feeding device comprises a balanced amplifier, inputs of which are arranged to receive signals to be transmitted and an output of which is balanced, and a balanced filter, inputs of which are arranged to receive signals from said amplifier and outputs of which are arranged to transmit signals to said first antenna element.
18. A portable radio communication device comprising an antenna device, said antenna device comprising
a first antenna element comprising a first feeding portion connected to a first feeding device,
a second antenna element comprising second feeding portions connected to a second feeding device, wherein
said first antenna element has an unbalanced feed and is positioned spaced apart from a ground plane and essentially parallel thereto,
said second antenna element has an essentially balanced feed, and
said second antenna element is a loop antenna.