Planar antenna structure and radio device
First Claim
1. A planar antenna structure for a radio device having at least one operating band and comprising a ground plane, radiating element, feed element, feed circuit and an antenna port, wherein the radiating element is galvanically isolated from other conductive parts of the radio device, there is an electromagnetic coupling between the radiating element and feed element to transfer transmitting energy to field of the radiating element and receiving energy to field of the feed element, and the feed circuit is reactive and it connects an antenna feed point in the feed element to the antenna port and ground plane in order to set said at least one operating band to a desired range on the frequency axis and to match the antenna.
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Accused Products
Abstract
A planar antenna structure intended to be used in small portable radio devices and a radio device using an antenna structure according to the invention. The radiating element (340) of the antenna is a conductive part in the cover of the radio device or a conductive coating attached to the cover. The radiating element is fed electro-magnetically by a parallel planar feed element (330) connected to the antenna port and located near the radiating element, between it and the ground plane (310). Between the feed element and antenna port there is a feed circuit (320) to provide matching for the antenna and, if necessary, forming an additional operating band. The radiating element need not be shaped to set the resonating frequencies or match the antenna. Instead, it can be designed relatively freely, based on the desired external appearance of the device, for example. Moreover the antenna requires relatively little space within the device.
77 Citations
13 Claims
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1. A planar antenna structure for a radio device having at least one operating band and comprising a ground plane, radiating element, feed element, feed circuit and an antenna port, wherein
the radiating element is galvanically isolated from other conductive parts of the radio device, there is an electromagnetic coupling between the radiating element and feed element to transfer transmitting energy to field of the radiating element and receiving energy to field of the feed element, and the feed circuit is reactive and it connects an antenna feed point in the feed element to the antenna port and ground plane in order to set said at least one operating band to a desired range on the frequency axis and to match the antenna.
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13. A radio device comprising a planar antenna structure, which has at least one operating band and comprises a ground plane, radiating element, feed element, feed circuit and an antenna port, 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, and the feed circuit is reactive and it connects an antenna feed point in the feed element to the antenna port and ground plane in order to set said at least one operating band to a desired range on the frequency axis and to match the antenna.
Specification