A broadband amplifier with a negative feedback circuit having a variable resistance means and first and second parallel resistor-inductor combinations for slope control is shown. The variable resistance means establishes the overall frequency response and can be electronically varied to provide automatic gain control. The first and second parallel resistor-inductor combinations provide compensation for deviations from the desired frequency response over respective first and second frequency rang…

A voltmeter comprising a diode detector, a square root converter and a linear amplifier each connected to receive the diode detector output signal, a resistance network connected to receive the outputs of the square root converter and the linear amplifier, means for selectively switching the resistances of the resistance network to change the proportion at the resistance network output between the signal from the square root converter and the signal from the linear amplifier to inversely match t…

The band-limiting effects of parasitics are minimized in a two-stage amplifier wherein the active elements are operated in the common collector and the common base configurations. A pair of impedances Z.sub.1 and Z.sub.2 connect the emitter of one of the transistors to the emitter and the collector, respectively, of the other transistor. The collector of the latter transistor serves as the amplifier output terminal. Operating into a high impedance output load, the gain of the amplifier is given …

A high return loss is maintained over the passband of a broadband transformer by reducing parasitic interwinding capacitance. This is accomplished by locating the windings along physically separated regions of a common magnetic core. To compensate for any loss of magnetic coupling at the higher frequencies due to a decrease in core permeability, equal portions of the physically separated windings are connected in parallel.

A balun comprised as electrical leads forming a slot line and having a tapered configuration to provide a matching impedance to an asymmetrical conducting system such as coaxial cable, strip-line, microstrip, etc. Broadband impedance matching is achieved between symmetrical and asymmetrical electrical transmission systems.

Wideband antenna systems may provide continuous coverage over the VLF, HF, VHF, and UHF frequency ranges. Matching transformers, insertion resistors and damping elements are integral parts of these antenna systems.

A broadband radiometer including (a) an optical integrating sphere having a enerally spherical integrating chamber and an entry port for receiving light (e.g., having visible and ultraviolet fractions), (b) a first optical radiation detector for receiving light from the sphere and producing an electrical output signal corresponding to broadband radiation, (c) a second optical radiation detector for receiving light from the sphere and producing an electrical output signal corresponding to a prede…

A broadband antenna comprising a connector which is adapted to be connected to a source RF energy having a frequency of 136-174 MH.sub.z or 300-500 MH.sub.z. The connector is secured to one end of a hollow housing which encloses a transformer. One end of transformer is connected to the connector while the other end of the transformer is connected to a radiator. The assembly is enclosed in a sheath with cap.

A broadband space switch matrix includes a parallel combination of individual switch modules each comprising a cascade of pass-transistor selectors, NAND gates, and inverters arranged into a multi-stage tree multiplexing configuration. The switching speed is increased by isolating each switching crosspoint from the stray capacitive loading in the matrix.

A broadband loudspeaker radiating as an approximate point source, whose movable components are fastened to a dome-shaped loudspeaker front, wherein the loudspeaker front flares rearwardly to an enclosure shell disposed coaxially around the central axis of the enclosure and a diagonally disposed deflection plane, which can be formed as the back wall, faces the back side of the diaphragm. The inside cross section of the enclosure shell is preferably a polygon with an odd number of sides, as is the…