Abstract: A three-wave shared antenna used in an automobile comprises an MT wave element 10A wherein first and second phasing coils 11 and 12 are formed in an intermediate position of a conductive mast thereby forming the MT wave element 10A is formed in a three-step collinear manner to be able to transmit/receive an MT wave, a trap element 10B for interrupting the MT wave formed on top portion of the MT wave element 10A, and an auxiliary element 10C for AM and FM waves, which comprises another conductive mast connected to said conductive mast through the trap element 10B to be able to receive AM wave, which is a broadcast wave of an amplitude modulation system and FM wave, which is a broadcast wave of a frequency modulation system, in cooperation with said MT wave element.

Abstract: An automobile antenna fastening device comprising an inner fastening assembly and outer fastening assembly. The inner fastening assembly includes a gland washer made of an elastic material and a gland base, and the outer fastening assembly includes a pad and fastening nut. An antenna is mounted on the automobile body wall by clamping the automobile body wall between the outer and inner fastening assemblies, and the clamping force of the fastening assemblies is maintained by the elastic deformation of the gland washer of the inner fastening assembly.

Abstract: An antenna for portable radiotelephones including an antenna element and antenna holder. The antenna element is covered by a non-conductive cover except for the tip and base ends which respectively have a cap and a sleeve, both made of conductive materials thereon. The antenna holder is made of conductive materials, fixed in a case of the telephone and is connected to a matching device. The antenna holder includes a fastening section and an engaging section and holds therein the antenna element so the antenna element can be pulled outside of and pushed back into the case. The fastening section engages with the cap of the antenna element when the antenna element is pulled outside of the case. Thus, the antenna element can be kept in a state of electrical continuity with the antenna holder, which is electrically connected to the matching device, at all times.

Abstract: An antenna system for a portable radiotelephone which does not require an expensive mechanical and bulky change-over switch to switch between the transmitting and receiving main antenna element and the call signal-receiving sub-antenna element. This is accomplished by a rod-shaped transmitting and receiving main antenna element within an antenna retaining mechanism so designed that the antenna element is free to slide in and out of the case of the radiotelephone. This case also houses a sub-antenna element which is in constant electrical contact with the antenna retaining mechanism. Conductive components in the elements provide the switching function, and one of them, a conductive tube, is constantly connected to the transmitter-receiver set in the case so that there is no deterioration of the characteristics of the main antenna element.

Abstract: An improved transmitting and receiving antenna for a portable radiotelephone with an antenna element which can be accommodated inside of the case of the portable radiotelephone, compensating for the drop in reception sensitivity that occurs when the antenna element is located inside of the case. The rod-shaped antenna element freely insertable into and removable from the case, and electrically connected to an antenna retaining mechanism both when the antenna element is retracted and extended. Thus, the antenna element functions even when it is located inside of the case. Moreover, an auxiliary antenna element is connected to the antenna element when the latter is located inside the case. The inductive reactance component of the auxiliary antenna element compensates for deterioration of the Standing Wave Ratio caused by the increased stray capacity resulting from the antenna element being located of inside the case.