| abstract |
The invention relates to a method of manufacturing a structure suitable as an internal antenna in small radio devices, and an antenna element to which the method is applied. The antenna element comprises a radiating plane and additionally e.g. supportive elements, a feed conductor and short-circuit conductor as well as extensions to increase capacitance. The antenna element is fabricated by first extruding from a billet an antenna billet, and working the latter as required. The antenna billet may be symmetrical so that two antenna elements will be produced when it is cut in half. Advantageously the antenna element is fabricated so as to conform with the covering of the device in which it is placed. It may also be part of a covering of a device. The manufacturing costs of the antenna element are relatively low and the radio characteristics of the element are good. An antenna structure employing the element has got few separate parts and is mechanically firm and space-conserving. |