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Title      : Microwave Engineering
Subject      : Microwave Engineering
copyright © 2018   : Sanguine Technical Publishers
Author      : Somanathan Nair B
Publisher      : Sanguine Technical Publishers
Chapters/Pages      : 14/466
Total Price      : Rs.      : 338
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Fundamental Principles Total views (409)  
In 1864, James Clark Maxwell, the famous British physicist, predicted the existence of electromagnetic (EM) waves. In 1887, Heinrich Hertz, the German scientist, was able to generate EM waves for the first time in the history of science and engineering. Since then, there has been tremendous progress in the theory and applications of EM waves. Consider a very elementary experiment in which we place ......
Pages: 20
Price: Rs 0   
Limitations of Conventional Vacuum Tubes Total views (407)  
It is observed that, as the frequency of operation is increased, conventional vacuum tubes such as triodes cease to function properly. This happens when the frequency of operation is in or above the very high frequency (VHF) range.
Pages: 8
Price: Rs 6   
Microwave Vacuum Tubes Total views (409)  
One of the major problems they encounter is the transit-time effects. To reduce transit time, dimensions of the ordinary vacuum tubes were considerably reduced. This resulted in special microwave vacuum tubes such as the acorn tube and the light-house tube. These tubes have now become obsolete. Even though transit time was a major problem in ordinary vacuum tubes, it was discovered that this effec ......
Pages: 84
Price: Rs 63   
Microwave Semiconductor Devices Total views (410)  
Microwave semiconductor devices can, in general, be classified as two-terminal device (microwave diodes) and three-terminal devices (microwave transistors). The major microwave diodes are the tunnel diode, the Gunn diode, the IMPATT diode, the TRAPATT diode, the BARRITT diode, the Schottky-barrier diode, the varactor diode, and the pointcontact diode. Microwave transistors include BJT and FET devi ......
Pages: 58
Price: Rs 43.5   
Masers and Lasers Total views (411)  
The word MASER has been derived from the words Microwave Amplification by Stimulated Emission of Radiation. Even though these words actually describe a process, the shortform derived from the words, viz., MASER, is used to describe the device that produces amplification. Masers are low-noise microwave amplifiers, invented by C. H. Townes, J. J. Ziegler, and J. P. Gordon in 1954. The word LASER was ......
Pages: 18
Price: Rs 13.5   
Parametric Amplifiers Total views (406)  
A parametric amplifier (paramp) is one that makes use of a nonlinear reactive device such as a capacitor or an inductor for producing amplification. Since capacitors and inductors are two-terminal devices, parametric amplifiers are two-terminal amplifiers. The major problem associated with such amplifiers is that they have the same (common) terminals for applying the input and the output, and henc ......
Pages: 16
Price: Rs 12   
Scattering Parameters Total views (409)  
Four-terminal networks can be represented in terms of Z, Y, h, g, and T parameters. These parameters are sufficient at low frequencies for representing the network concerned.
Pages: 44
Price: Rs 33   
Microwave Transmission Lines Total views (407)  
Compare the solution of (8.4) with that of (8.6). It is found that the general solution of the former equation contains an exponentially increasing function and an exponentially decreasing function. Depending on the boundary conditions available, we can determine which of the two components will be the real solution. In a similar fashion, it is found that the general solution of (8.6) contains two ......
Pages: 68
Price: Rs 51   
Passive Microwave Components Total views (418)  
Low-frequency transmission of electrical signals through wires and transmission lines is essentially a one-dimensional operation in time. Wires are interconnected by using soldering or other similar techniques. The above picture is totally lost, when we deal with microwave frequencies. In the microwave region, we know that electrical signals get propagated in the form of electromagnetic waves, whi ......
Pages: 22
Price: Rs 16.5   
Microwave Measurements Total views (434)  
Microwave energy is used in several industrial applications. For example, if we want to design a microwave oven, then we must know precisely how much microwave power is going to be used by the oven, and for this we must measure it. Thus, power measurement is an important task in any microwave application. In some other applications, we must know the way in which microwave radiation is propagating. ......
Pages: 22
Price: Rs 16.5   
Applications of Microwaves Total views (446)  
Electromagnetic waves in the microwave range find applications in several fields, which include communication, medicine, remote sensing, etc. The special features of microwaves that are of importance in applications are Very small wavelengths (on the order of centimeters and millimeters), Reduction in the size of components due to the small wavelengths involved, Straight-line (or line-of-sight) na ......
Pages: 26
Price: Rs 19.5   
Hazards of Microwave Radiation Total views (447)  
Energy in concentrated form is always dangerous, under any circumstances, to living organisms. When energy gets concentrated at a point (or area), it will heat up that point (or area). If the heat generated is excessive, then it can destroy the point (or area) concerned. Such concentrated form of energy is available with small-wavelength entities, such as microwave, optical, and ultrasonic frequen ......
Pages: 4
Price: Rs 3   
Impedance Matching Total views (456)  
One of the major problems that is commonly and frequently encountered in the transmission of information over long distances is the problem of impedance matching. Consider the long transmission line shown in Fig. 13.1. The transmission line is fed froma source voltageVS, having an internal impedance of ZS ohms. This transmission line delivers the electrical power input to it to a load impedance of ......
Pages: 14
Price: Rs 10.5   
Microwave Filters Total views (463)  
We know that electromagnetic frequency spectrum consists of frequencies ranging from 0Hz (DC) to about 1018 Hz (cosmic rays). It can be easily observed that this is an extremely wide frequency range. However, in most practical cases, we have to deal with only a very small range of frequencies in the vast range mentioned above. For example, in modern telephone transmission, a frequency range of 0-4 ......
Pages: 62
Price: Rs 46.5   

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