Abstract: A wearable chassis for a helmet has a shape suitable to be worn on a head of a user and being attachable inside a protective structure having a shape protecting the user's from an external impact. The chassis includes one or more connection ports for connecting an electronic device, a control interface for connecting a control unit, a wiring arrangement for connecting the one or more connection ports to the control interface, and a mounting arrangement for attaching an accessory device to the chassis. Moreover, a helmet including such a chassis and the protective structure having a shape protecting a head of a user from an external impact attached to the chassis, as well as a helmet arrangement including such a chassis and one or more protective structures, each having a shape protecting a head of a user from an external impact, removably attachable to the chassis are provided.

Abstract: A wearable chassis for a helmet has a shape suitable to be worn on a head of a user and being attachable inside a protective structure having a shape protecting the user's from an external impact. The chassis includes one or more connection ports for connecting an electronic device, a control interface for connecting a control unit, a wiring arrangement for connecting the one or more connection ports to the control interface, and a mounting arrangement for attaching an accessory device to the chassis. Moreover, a helmet including such a chassis and the protective structure having a shape protecting a head of a user from an external impact attached to the chassis, as well as a helmet arrangement including such a chassis and one or more protective structures, each having a shape protecting a head of a user from an external impact, removably attachable to the chassis are provided.

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.

Abstract: Antenna structure (200) which finds particular utility in mobile stations and the electrical characteristics of which can be electrically modified. The radiating element (210) of the antenna or a part thereof is manufactured from a strongly magnetostrictive material. The antenna is equipped with at least one electromagnet (220) by means of which a magnetic field (?) can be generated into the magnetostrictive material. This causes the radiating element to grow (?l) in a certain direction, whereby the resonance frequency of the antenna will decrease. The antenna can be electrically adjusted without adding any component in the antenna itself, thereby making the adjustment reliable.

Abstract: Antenna structure (200) which finds particular utility in mobile stations and the electrical characteristics of which can be electrically modified. The radiating element (210) of the antenna or a part thereof is manufactured from a strongly magnetostrictive material. The antenna is equipped with at least one electromagnet (220) by means of which a magnetic field (&psgr;) can be generated into the magnetostrictive material. This causes the radiating element to grow (&Dgr;l) in a certain direction, whereby the resonance frequency of the antenna will decrease. The antenna can be electrically adjusted without adding any component in the antenna itself, thereby making the adjustment reliable.

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.

Abstract: An antenna (400; 600) for transmitting and receiving radio-frequency signals comprises a cylindrical coil conductor (601) having a turn A and a turn B and between them other turns. The pitch (x1) of turn A is unequal to the pitch (x2) of said turn B, and the pitches of the other turns between turns A and B are in the order of magnitude between the pitches of turns A and B.