Multiband antenna
First Claim
1. A multiband antenna for a radio device, the antenna having at least a first and a second operating band and comprising a ground plane, a radiating element, a feed element, a feed conductor and a shorting conductor, whereinthe radiating element is galvanically insulated from the other conductive parts of the radio device, and the feed conductor and the shorting conductor are connected to the feed element, a connection point of the shorting conductor divides the feed element into a first part and a second part, the first part of the feed element together with the radiating element and the ground plane are arranged to resonate in a range of the antenna'"'"'s first operating band, and the second part of the feed element together with the radiating element and the ground plane are arranged to resonate in a range of the antenna'"'"'s second operating band, and the radiating element has a hole, which is arranged to resonate at a third frequency.
5 Assignments
0 Petitions
Accused Products
Abstract
An internal multiband antenna and a radio device intended particularly for small-sized radio devices. The antenna has a relatively wide surface radiator (330), which is electromagnetically connected to the antenna port of the radio device via a separate feed element (320). At least two useful resonances are generated with the aid of the feed element, and at least one inherent resonance of the radiator is also utilized. The radiator has a hole (350), by which one useful additional resonance is generated. An oscillation is excited in the hole by placing the feed element close to its edge and by suitably choosing the locations of the feed point (F) and the shorting point (S) of the feed element. The frequency of the hole resonance is finely tuned by varying the capacitance between the hole'"'"'s edge and the ground plane at a suitable place (331). An operating band of the antenna can be widened by means of said additional resonance. If a mobile station has a rear display it is possible at the same time to use its hole as a radiator.
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Citations
14 Claims
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1. A multiband antenna for a radio device, the antenna having at least a first and a second operating band and comprising a ground plane, a radiating element, a feed element, a feed conductor and a shorting conductor, wherein
the radiating element is galvanically insulated from the other conductive parts of the radio device, and the feed conductor and the shorting conductor are connected to the feed element, a connection point of the shorting conductor divides the feed element into a first part and a second part, the first part of the feed element together with the radiating element and the ground plane are arranged to resonate in a range of the antenna'"'"'s first operating band, and the second part of the feed element together with the radiating element and the ground plane are arranged to resonate in a range of the antenna'"'"'s second operating band, and the radiating element has a hole, which is arranged to resonate at a third frequency.
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12. A radio device provided with a multiband antenna having at least a first and a second operating band comprising a ground plane, a radiating element, a feed element, a feed conductor and a shorting conductor, wherein
the radiating element is galvanically insulated from the other conductive parts of the radio device, and the feed conductor and the shorting conductor are connected to the feed element, a connection point of the shorting conductor divides the feed element into a first part and a second part, the first part of the feed element together with the radiating element and the ground plane are arranged to resonate in a range of the antenna'"'"'s first operating band, and the second part of the feed element together with the radiating element and the ground plane are arranged to resonate in a range of the antenna'"'"'s second operating band, and the radiating element has a hole, which is arranged to resonate at a range of an operating band.
Specification