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542 questions
What is E-plane Tee? Derive its S-matrix.
E-plane tee is a three port network. Here the auxiliary or side arm axis is parallel t the plane of the electric field of the main guide and hence this tee is known as E –plane Tee.
What are the difference between TED’s and junction device?
The difference between TEDs and Transistor as a junction device are as follows: Transistors operates with either junctions or gates while TEDs are bulk devices having no junction or gates
Explain Read diode. Give the electric field distribution, doping profile, voltage and current characteristics of read diode.
Read diode is nothing but the INPATT diode. The IMPATT diode is a convenient structure for a theoretical analysis and physical understanding but due to complicated nature IMPATT structure the prediction could not be immediately verified experimentally.
Why Schottky diodes are suitable for microwave region?
It is a simple metal semiconductor interface exhibiting non – linear impedance and is basically an extension of the point contact diode. When the diodes are forward biased current follows because of majority carrier from semiconductor into the metal.
Determine the spacing between 2 – holes in a 2 –hole directional coupler made in rectangular waveguide version with inner dimension of 2.286 cm X 1.00 cm at 9 GHz.
Given that b=1 cm, a=2.286 cm and f=9 GHz We know that
Define microwave. What is the significance of using ‘S’ parameter in microwave engineering.
Microwaves are a form of electromagnetic radiation with wavelength ranging from as long as one meter to as short as one millimeter, or equivalently, with frequencies between 300 MHz (0.3 GHz) and 300 GHz.
Explain how high value of VSWR can be measured by the double minimum method.
Measurement of VSWR gives the degree of mismatch between the load and the transmission line. Complex load shifts the face and hence minimum position, so load impedance can be calculated from the VSWR and the position of the minimum point on the line with respect to the load.
Describe the operation of an ideal four port ‘directional coupler’. Define ‘Coupling’ and ‘Directivity’ in the context of a directional coupler.
The directional coupler consists of two transmission lines or waveguides coupled together by fringing fields, or in case of a waveguide, by means of a small slot in such a manner that an incident wave on one line is partly transferred to the other with particular directional properties.
What is scattering Parameters? Why is it used in microwave Network?
Any two port networks are represented by a special type of parameter by which reflection co- efficient or transmission co – efficient of any network is measured. This special type of parameter is called scattering parameter of S - parameter.
What are cross field device? What role does the dc magnetic field play in their normal operation?
The cavity magnetron is a cross field device. Here the electric field between anode and cathode is radial whereas the magnetic field produced by a permanent magnet is axial. The permanent magnet is placed such that the magnetic lines are parallel to the vertical cathode and perpendicular to the electric field between cathode and anode.
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