Microwave Communication Questions

• As compared to their values in free space
• A rectangular waveguide has a discontinuity in the form of reduced narrow dimension. In the equivalent circuit this discontinuity can be represented by
• In an optional fiber the refractive index of cladding material should be
• What is the numerical aperture an optical fiber when critical angle is 30°?
• If rv is reflection coefficient and VSWR is voltage standing wave ratio, then
• A line of characteristic impedance Z0 branches into two line each with characteristic impedance Z0. The refracted voltage is
• The resistance values of a PIN diode under positive bias and negative bias respectively are about
• The AM, PM, and TV broadcast frequencies are
• A microwave junction is matched at all ports if the S matrix
• The effect of earth's magnetic field on radiowaves is minimum when
• In a microwave power measurement using bolometer, the principle of working is variation of
• In a loss less line the propagation constant is equal to
• The primary constants of a transmission line are
• Reflection from the object to be measured is significant only when the wavelength is
• The total power radiated from an antenna system is determined by imagining that the antenna is at the centre of a very large
• In TE10 mode of rectangular waveguide
• A line is excited by a 100 V, 200 ohm source and is terminated by 100 Ω resistance. If the voltage on line reaches steady value in 80 ns, the natural resonant frequency is
• TE01 mode of propagation of electromagnetic energy
• For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about
• A PIN diode can be used