Titlebook: Microwave Electronic Devices; Theo G. Roer Book 1994 Springer Science+Business Media Dordrecht 1994 Diode.Modulation.circuit.communication

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Diodes,ide in the sense that passive diodes are used for frequency conversion and control and active diodes for signal generation. In the following we will discuss the many physical diode structures that exist nowadays. Applications will be discussed in Chapters 8, 9 and 10.

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Carrier transport and noise in devices,ctor devices, which in general are small compared with a wavelength, this simplifies to the response of the terminal currents to the terminal voltages. Depending on what the purpose is we distinguish two kinds of models: physical models and equivalent circuits.

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Transmission lines and microwave circuits,nt y is called the . and is in general a complex quantity. Its real part (α) is called the . and its imaginary part (.) the .. For lossless lines the . dependence simplifies to exp[j (ω. — .)]. Another important quantity that characterizes a transmission line is the . Z., in principle also a complex quantity.

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History,nna had the same dimensions. Hertz also used parabolic mirrors and lenses of dielectric material. In 1893 Lord Kelvin gave a theoretical analysis of hollow waveguides and shortly afterwards Oliver Lodge demonstrated waveguides at frequencies of 1.5–4 GHz.

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Semiconductor materials,rowave semiconductor devices it is therefore necessary to have some understanding of the physics involved. What follows is not intended as a crash course in semiconductor physics but as a brief memory-refreshing review for those who previously had a course in semiconductor physics.

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Amplifiers,mmunication satellites. In these systems, when the power is not too great, say 20 W, transistor amplifiers can be used; for greater powers vacuum tubes are still necessary. In particular, traveling wave tubes are still widely used because of their large bandwidth and high amplification.