Dual antenna and radio device
First Claim
1. An arrangement for enhancing electrical isolation between antennas which comprise a first antenna and a second antenna belonging to one and the same radio device, wherein at least the first antenna comprises structural parts to degrade its matching at frequencies of an operating band of the second antenna.
5 Assignments
0 Petitions
Accused Products
Abstract
An arrangement for enhancing electrical isolation between antennas in antenna structures comprising at least two antennas, and a radio device applying the arrangement. The interfering antenna comprises components causing substantial degradation in radiation characteristics in the operating band of another antenna. For example, a PIFA (310) may comprise, instead of a short-circuit conductor, a conductive structure (312, 313, 314) having a parallel resonance in the operating band of another antenna (320). Mutual interference of radio parts using separate antennas can be made relatively small without electrical isolation arrangements between antenna elements. Moreover, the invention makes antenna filter design easier and reduces disadvantages caused by antenna filters.
78 Citations
18 Claims
- 1. An arrangement for enhancing electrical isolation between antennas which comprise a first antenna and a second antenna belonging to one and the same radio device, wherein at least the first antenna comprises structural parts to degrade its matching at frequencies of an operating band of the second antenna.
- 2. An arrangement for enhancing electrical isolation between antennas which comprise a first antenna and a second antenna belonging to one and the same radio device, wherein at least the first antenna comprises structural parts to degrade its matching at frequencies of an operating band of the second antenna, where the first antenna is a PIFA having a radiating plane and a ground plane, wherein said structural parts to degrade the matching of the first antenna constitute a parallel resonance circuit, which replaces a short-circuit conductor in the PIFA and resonance frequency of which is substantially the same as resonance frequency of the second antenna.
- 4. An arrangement for enhancing electrical isolation between antennas which comprise a first antenna and a second antenna belonging to one and the same radio device, wherein at least the first antenna comprises structural parts to degrade its matching at frequencies of an operating band of the second antenna, where the first antenna is a PIFA, said structural parts to degrade the matching of the first antenna constituting a series resonance circuit which replaces feed conductor in the PIFA and resonance frequency of which is substantially the same as resonance frequency of the first antenna.
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6. An arrangement for enhancing electrical isolation between antennas which comprise a first antenna and a second antenna belonging to one and the same radio device, wherein at least the first antenna comprises structural parts to degrade its matching at frequencies of an operating band of the second antenna, where the first antenna is a PIFA, said structural parts to degrade the matching of the first antenna constituting an inductive circuit element which replaces short-circuit conductor in the PIFA and a capacitive circuit element which replaces a feed conductor in the PIFA.
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13. A radio device with a first antenna and a second antenna, wherein at least the first antenna includes structural parts to degrade its matching at the frequencies of an operating band of the second antenna and thus to enhance electrical isolation between said antennas.
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15. An arrangement for enhancing electrical isolation between antennas which comprise a first antenna and a second antenna belonging to one and the same radio device, wherein at least the first antenna comprises structural parts to degrade its matching at frequencies of an operating band of the second antenna;
- where the first antenna is a PIFA having a radiating plane and a ground plane, the arrangement comprising a circuit board between the radiating plane and ground plane of the first antenna and said structural parts to degrade the matching of the first antenna being located on the circuit board.
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16. An arrangement for enhancing electrical isolation between antennas which comprise a first antenna and a second antenna belonging to one and the same radio device, wherein at least the first antenna comprises structural parts to degrade its matching at frequencies of an operating band of the second antenna;
- where the first antenna is a PIFA having a radiating plane and a round plane, the arrangement comprising a circuit board between the radiating plane and ground plane of the first antenna and said structural parts to degrade the matching of the first antenna being located on the circuit board;
further comprising an inductive circuit element formed of conductive material in connection with the radiating plane and ground plane in the first antenna. - View Dependent Claims (17, 18)
- where the first antenna is a PIFA having a radiating plane and a round plane, the arrangement comprising a circuit board between the radiating plane and ground plane of the first antenna and said structural parts to degrade the matching of the first antenna being located on the circuit board;
Specification