Internal multiband antenna
First Claim
1. An internal antenna of a radio device, which antenna has at least a lower and an upper operating band and comprises a ground plane and a radiating planar element with an antenna feed point, a short-circuit point and a first slot starting from an edge of the planar element, conductive plane of the planar element being arranged to resonate in the lower operating band, wherein the planar element further comprises a second slot starting from said edge thereof, going between the feed point and the short-circuit point and being arranged to cause a resonance in the upper operating band.
5 Assignments
0 Petitions
Accused Products
Abstract
A multiband antenna applicable as an internal antenna in small mobile terminals especially. The antenna (200) is a PIFA placed inside the housing of a mobile station with at least two operating bands. A first resonance falling into a lower operating band is produced by means of a radiating conductive pattern (B21) in planar element (220). To improve the characteristics of the antenna in the upper operating band the planar element further comprises a slot (232) which goes between the feed point (F) and the short-circuit point (S) of the antenna. The radiator provided by this slot can be considered a quarter-wave slot radiator or a half-wave loop radiator. The PIFA further may have another radiator, which resonates in the upper operation band. By means of said slot the upper operating band of an antenna can be widened or the radiation in the horizontal plane in the upper operating band can be made more effective.
62 Citations
9 Claims
- 1. An internal antenna of a radio device, which antenna has at least a lower and an upper operating band and comprises a ground plane and a radiating planar element with an antenna feed point, a short-circuit point and a first slot starting from an edge of the planar element, conductive plane of the planar element being arranged to resonate in the lower operating band, wherein the planar element further comprises a second slot starting from said edge thereof, going between the feed point and the short-circuit point and being arranged to cause a resonance in the upper operating band.
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9. A mobile terminal with an internal antenna which has at least a lower and upper operating band and comprises a ground plane and a radiating planar element with an antenna feed point, a short-circuit point and a first slot starting from an edge of the planar element, conductive plane of the planar element being arranged to resonate in the lower operating band, wherein the planar element further comprises a second slot starting from said edge thereof, going between the feed point and short-circuit point and being arranged to cause a resonance in the upper operator band.
Specification