Abstract: A formed body of Cu—Al—Mn-based shape-memory alloy may include a screw portion, wherein the screw portion is a form-rolled portion. A method for producing a formed body of Cu—Al—Mn-based shape-memory alloy may involve forming a screw portion having superelasticity by plastically working at least a portion of a material for the formed body with form-rolling in a state that a crystal structure is an A2-type structure and then, subjecting heat-treatment so as to convert the A2-type crystal structure into an L21-type crystal structure. The screw portion can be formed with good working property, and has excellent fatigue resistance and breaking resistance.

Abstract: An extendible whip antenna assembly (37) is provided with a combination of a helical antenna (39) mounted on an outer surface of a housing of a radio communication equipment, and a whip antenna (41). The whip antenna is movable between a retracted position in the housing and an extended position out of the housing. The extendible whip antenna assembly is further provided with a feeding arrangement for stopping the whip antenna at the extended position and feeding the whip antenna and the helical antenna. The feeding arrangement comprises a stopper (45) formed of an elastic electric conductive material and mounted on an end of the whip antenna for preventing the whip antenna from falling off from the housing, and a holder formed of an electric conductive material and electrically connected to a transceiver circuit within the housing. The holder serves to secure the helical antenna to the housing and is electrically connected to the stopper when the whip antenna is in the extended position.

Abstract: An extendible whip antenna assembly (37) is provided with a combination of a helical antenna (39) mounted on an outer surface of a housing of a radio communication equipment, and a whip antenna (41). The whip antenna is movable between a retracted position in the housing and an extended position out of the housing. The extendible whip antenna assembly is further provided with a feeding arrangement for stopping the whip antenna at the extended position and feeding the whip antenna and the helical antenna. The feeding arrangement comprises a stopper (45) formed of an elastic electric conductive material and mounted on an end of the whip antenna for preventing the whip antenna from falling off from the housing, and a holder formed of an electric conductive material and electrically connected to a transceiver circuit within the housing. The holder serves to secure the helical antenna to the housing and is electrically connected to the stopper when the whip antenna is in the extended position.

Abstract: In a multi-band antenna (10) being provided with an antenna element having an LC parallel resonance circuit (3) and a first and a second radiation element (1,2) connected to opposite ends of the LC parallel resonance circuit, the LC parallel resonance circuit is constituted by self-resonance of an inductor itself. A telescopic whip antenna may be constituted by combining a small-size antenna and a whip antenna which is receivable in a radio device casing and expandable.