Abstract: A helix antenna with a cap of high dielectric coefficient, which includes the cap to be installed on the end portion of an insulating sleeve, a coil is positioned in the cap and the insulating sleeve. The cap is made of high dielectric coefficient material with an internal extension post integrally shaped therein in matching with the coil by diameter in order that the coil is fitted over the internal extension post, a high dielectric coefficient thus is obtained inside the coil to thereby decrease wavelength correspondingly. Verticality of the coil can be corrected to improve electric stability and make the overall length of the helix antenna be shortened effectively. Thus an improved helix antenna can be formed.

Abstract: An instantly welded antenna of which a helical coil is positioned on an end face of a metallic seat member thereof; the metallic seat member and the helical coil are put into a matched inner blind hole of a plastic insulating sleeve. A heated surface provided on the metallic seat member can be heated instantly. The peripheral surface of the metallic seat member and the inside surface of the matched inner blind hole of the insulating sleeve is used as a heat conductive welding surface to weld the metallic seat member and the insulating sleeve, and the helical coil is positioned therein. Thus, the core diameter, the pitch and the overall length of the helix coil can be maintained, not only the inferiority of products is lowered, but also the processing efficiency of the products is increased.

Abstract: An antenna assembled by actions of vacuum and static electric attraction, which includes a sleeve and an inner connecting rod able to be inserted in and connected to the sleeve and installed therein a helix coil and a metallic connecting seat, the sleeve and the connecting rod are made of flexible material of different friction coefficients; the sleeve has an upper closed end and a bottom opening, an inner bore with plural sections with their diameters gradually enlarged from the inside to the outside are provided therein, at least two inner annular recesses are longitudinally distributed along the antenna to prevent air from communication with the outside and to generate attraction; the connecting rod has plural rod sections corresponding by position to the plural sections of the inner bore, and plural annular protrusions of identical cross-sectional shapes respectively to those of the annular recesses are provided on the inner connecting rod which is inserted through the bottom of and fits the sleeve tight.