microwave solid state devices
... applications from low power radar systems to alarms. Nevertheless these diodes make excellent microwave generators for many applications. An alternating signal is generated simply by applying a DC supply when a suitable tuned circuit is applied. The output is reliable and relatively high when compar ...
... applications from low power radar systems to alarms. Nevertheless these diodes make excellent microwave generators for many applications. An alternating signal is generated simply by applying a DC supply when a suitable tuned circuit is applied. The output is reliable and relatively high when compar ...
GAAS: A Fully Integrated SiGe Low Phase Noise Push
... SiGe integrated circuits can open up mass markets for millimeter wave systems due to the significant lower costs. Using enhanced circuit concepts as the push-push topology allows to reach a maximum in performance with a given technology. In combination with passive components realizable in monolithic ...
... SiGe integrated circuits can open up mass markets for millimeter wave systems due to the significant lower costs. Using enhanced circuit concepts as the push-push topology allows to reach a maximum in performance with a given technology. In combination with passive components realizable in monolithic ...
Hour 1 Atoms to frequency
... We must understand that both of these are happening at the same time, it is only a matter of how we look at what is happening. If we take a bottle of water with a narrow neck and dump it into a sink do you see bubbles flowing upwards or water flowing downward? One can not happen without the other. S ...
... We must understand that both of these are happening at the same time, it is only a matter of how we look at what is happening. If we take a bottle of water with a narrow neck and dump it into a sink do you see bubbles flowing upwards or water flowing downward? One can not happen without the other. S ...
2016 China International Conference on Electricity Distribution
... equipment. It is easy to fail under high frequency voltage, the main cause of which is partial discharge (PD). A comprehensive test system is established to study the impacts of the frequency on PD characteristics. The PD inception voltage (PDIV), PD times, and PD mean amplitude of polyimide film ar ...
... equipment. It is easy to fail under high frequency voltage, the main cause of which is partial discharge (PD). A comprehensive test system is established to study the impacts of the frequency on PD characteristics. The PD inception voltage (PDIV), PD times, and PD mean amplitude of polyimide film ar ...
Electric current
... nothing connected to it. There is no current, but a current can flow if there is a conductive path between the two points. Even a large emf might not drive much current through a conductor or resistance. A good example is your body after walking around on the carpet. Although the voltage seems dead ...
... nothing connected to it. There is no current, but a current can flow if there is a conductive path between the two points. Even a large emf might not drive much current through a conductor or resistance. A good example is your body after walking around on the carpet. Although the voltage seems dead ...
Extremely Low Frequency Plasmons in Metallic Microstructures
... transition temperature, dissipation could be small down to zero frequency. In the context of superconductivity it should be noted that plasma frequencies in these structures can be well below the gap energy of a conventional superconductor. Anderson [13] has stressed the role of the plasmon in the e ...
... transition temperature, dissipation could be small down to zero frequency. In the context of superconductivity it should be noted that plasma frequencies in these structures can be well below the gap energy of a conventional superconductor. Anderson [13] has stressed the role of the plasmon in the e ...
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron and traveling-wave tube (TWT), the magnetron cannot function as an amplifier, increasing the power of an applied microwave signal, it serves solely as an oscillator, generating a microwave signal from direct current power supplied to the tube.The first form of magnetron tube, the split-anode magnetron, was invented by Albert Hull in 1920, but it wasn't capable of high frequencies and was little used. Similar devices were experimented with by many teams through the 1920s and 30s. On November 27, 1935, Hans Erich Hollmann applied for a patent for the first multiple cavities magnetron, which he received on July 12, 1938, but the more stable klystron was preferred for most German radars during World War II. The cavity magnetron tube was later improved by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from their device made centimeter-band radar practical for the Allies of World War II, with shorter wavelength radars allowing detection of smaller objects from smaller antennas. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships.In the post-war era the magnetron became less widely used in the radar role. This was because the magnetron's output changes from pulse to pulse, both in frequency and phase. This makes the signal unsuitable for pulse-to-pulse comparisons, which is widely used for detecting and removing ""clutter"" from the radar display. The magnetron remains in use in some radars, but has become much more common as a low-cost microwave source for microwave ovens. In this form, approximately one billion magnetrons are in use today.