Internal multiband antenna
First Claim
1. An internal multiband antenna of a radio device having at least a first and a second operating band and comprising a ground plane, radiating element, feed element, feed conductor and a short-circuit conductor, whereinthe radiating element is galvanically isolated from the other conductive parts of the radio device, there is an electromagnetic coupling between the radiating element and feed element to transfer transmitting energy to the field of the radiating element and receiving energy to the field of the feed element, the feed element is connected through the short-circuit conductor to the ground plane at a short-circuit point to match the antenna, the short-circuit point divides the feed element into a first portion and second portion, and the first portion of the feed element together with the radiating element and ground plane is arranged to resonate in range of the first operating band of the antenna, and the second portion of the feed element together with the radiating element and ground plane is arranged to resonate in range of the second operating band of the antenna.
5 Assignments
0 Petitions
Accused Products
Abstract
An internal multiband antenna intended to be used in small-sized radio devices and a radio device having an antenna according to the invention. The radiating element (330) of the antenna is a conductive part in the cover of the radio device or a conductive surface attached to the cover. The radiating element is fed electro-magnetically by a feed element (320) connected to the antenna port. The feed element is designed (321, 322) such that it has, together with the radiating element and ground plane (310), resonating frequencies in the areas of at least two desired operating bands. In addition, the resonating frequency of the radiating element itself is arranged to fall into an operating band. Antenna matching is provided by feed element design and short-circuiting (315). The radiating element design can be based on the desired external appearance of the device, and the locations of the operating bands and antenna matching are provided through feed element design and short-circuiting. The antenna requires a relatively minor space within the device.
101 Citations
18 Claims
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1. An internal multiband antenna of a radio device having at least a first and a second operating band and comprising a ground plane, radiating element, feed element, feed conductor and a short-circuit conductor, wherein
the radiating element is galvanically isolated from the other conductive parts of the radio device, there is an electromagnetic coupling between the radiating element and feed element to transfer transmitting energy to the field of the radiating element and receiving energy to the field of the feed element, the feed element is connected through the short-circuit conductor to the ground plane at a short-circuit point to match the antenna, the short-circuit point divides the feed element into a first portion and second portion, and the first portion of the feed element together with the radiating element and ground plane is arranged to resonate in range of the first operating band of the antenna, and the second portion of the feed element together with the radiating element and ground plane is arranged to resonate in range of the second operating band of the antenna.
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18. A radio device, which includes an internal multiband antenna having at least a first and a second operating band and comprising a ground plane, radiating element, feed element, feed conductor and a short-circuit conductor, wherein
the radiating element is galvanically isolated from the other conductive parts of the radio device, there is an electromagnetic coupling between the radiating element and feed element to transfer transmitting energy to the field of the radiating element and receiving energy to the field of the feed element, the feed element is connected through the short-circuit conductor to the ground plane at a short-circuit point to match the antenna, the short-circuit point divides the feed element into a first portion and second portion, and the first portion of the feed element together with the radiating element and ground plane is arranged to resonate in a range of the first operating band of the antenna, and the second portion of the feed element together with the radiating element and ground plane is arranged to resonate in a range of the second operating band of the antenna.
Specification