Loop antenna with a magnetically coupled element
View Patent ↗A loop antenna with a magnetically coupled element is described. In an embodiment, the loop antenna comprises a loop element that has a feed contact and a ground contact. The loop antenna further comprises an open ended conductor that is magnetically coupled around the ground contact.
1. A loop antenna, comprising:
a loop element having a feed contact and a ground contact; and
an open ended conductor wrapped around and magnetically coupled with the ground contact, the open ended conductor comprising an open end and another end that is connected to a transmission line.
2. A loop antenna as claimed in claim 1 , wherein the length of the open ended conductor is substantially equal to a quarter of a wavelength at a frequency of operation.
3. A loop antenna as claimed in claim 1 , wherein the loop element is associated with a first radio system and the open ended conductor is associated with a second radio system.
4. A loop antenna as claimed in claim 3 , wherein the first radio system comprises a cellular radio system.
5. A loop antenna as claimed in claim 3 , wherein the second radio system comprises a complementary wireless system.
6. A loop antenna as claimed in claim 5 , wherein the complementary wireless system comprises at least one of a wireless local area network, a global positioning system, or a bluetooth system.
7. A loop antenna as claimed in claim 1 , wherein the open ended conductor is physically isolated from the ground contact.
8. A loop antenna as claimed in claim 1 , wherein the loop element comprises a folded loop element.
9. A loop antenna as claimed in claim 1 , wherein the open ended conductor is physically connected to a transmission line.
10. A loop antenna as claimed in claim 9 , wherein the loop element is associated with a first radio system and the open ended conductor is associated with a second radio system, and wherein the transmission line carries a signal of the second radio system.
11. A loop antenna as claimed in claim 1 , further comprising at least one matching circuit for adjusting a resonance frequency or impedance of the loop antenna.
12. A loop antenna as claimed in claim 1 , wherein the open ended conductor is wrapped around the ground contact while physically isolated from the ground contact.
13. A loop antenna as claimed in claim 12 , wherein the diameter of the open ended conductor wrapped around the ground contact is lower than a predetermined threshold to prevent the open ended conductor from acting as a radiator.
14. A loop antenna as claimed in claim 1 , wherein the open ended conductor acts as a resonating element.
15. A loop antenna, comprising:
a loop element having a feed contact and a ground contact; and
an open ended conductor wrapped around and magnetically coupled with the ground contact,
wherein the open ended conductor magnetically coupled around the ground contact comprises a planar structure.
16. A loop antenna as claimed in claim 15 , wherein the planar structure is arranged into layers of a printed wiring board.
17. A mobile apparatus, comprising:
at least one processor;
at least one memory storing program instructions; and
a loop antenna comprising:
a loop element having a feed contact and a ground contact; and
an open ended conductor wrapped around and magnetically coupled with the ground contact, the open ended conductor comprising an open end and another end that is connected to a transmission line.
18. A mobile apparatus as claimed in claim 17 , wherein the open ended conductor magnetically coupled around the ground contact comprises a planar structure.
19. A mobile apparatus as claimed in claim 18 , wherein the planar structure is arranged into layers of a printed wiring board of the mobile apparatus.
20. A mobile apparatus as claimed in claim 17 , wherein the loop antenna is arranged in a lower portion of the mobile apparatus.