Abstract: The present invention is an electrostatic transformer, and more particularly an electrostatic transformer capable of electrically insulating the input and output sides thereof without using any transformer. One A of input terminals A and B is connected to one end of a first capacitor C.sub.1 via a first switch S.sub.1 while the other B of the input terminals A and B is connected to the other end of the first capacitor C.sub.1 via a switch S.sub.4 ' opened and closed simultaneously with the opening and closing operations of the first switch S.sub.1 in interlock with same. The one and other terminals of the first capacitor C.sub.1 are connected to output terminals a and b, respectively, via a second switch S.sub.2 and a switch S.sub.2 ' closed and opened conversely to the opening and closing operations of the first switch S.sub.1 in interlock with same. The inventive electrostatic transformer has the above structure, so that if the first switches S.sub.1 and S.sub.

Abstract: A small, relatively wide-bandwidth, active antenna is usable in a wide range of applications spanning the VLF and SHF bands. The antenna is capable of receiving relatively weak radio frequency signals having a signal strength below that detectable using conventional passive antennas. The antenna includes a lumped constant element forming an electric wave receiving part, and a high impedence amplifier having input terminals connected via leads having a short electrical wavelength at the design frequency, to corresponding ends of the lumped constant element. Output terminals of the antenna are connected to a receiver to provide a small, high sensitivity, active antenna.

Abstract: A wide-band amplifier using a plurality of transistors used in transmission, voice, applications video, high-vision in CATV, etc., for example. In the wide band amplifier, an input signal is applied in common across the respective bases and corresponding emitters of the plurality of transistors and the respective output currents are withdrawn from the transistor collectors. Thus, the output currents of the transistors are reduced, possible distortions in the outputs are greatly reduced, the upper operating frequency limit (f.sub.T) is increased to about 3 GHz, and possible distortions in the output currents of the transistors are cancelled by inserting in the input circuit a transistor having the same characteristic as the first mentioned transistors.