Microwave Communication Questions

• A microwave connector should have high SWR.
• In the given figure shows a 10dB directional coupler. If power input at port 1 is 100 mW, power output at port 3 is
• In Gunn diode electrons are transferred from
• Satellite communication systems use the frequency band
• If μr is relative permeability, ∈r is relative permittivity, c is velocity of light fc is cutoff frequency, phase velocity vp (i.e., speed with which a particular phase of the wave travels down a rectangular waveguide at frequency f) is given by
• For a directional coupler the power is in the ratio of
• In a high frequency coaxial line and the length of line characteristic impedance is a function of
• The characteristic impedance of a cable is about
• In which of the following devices can the operation be visualised in terms of a series feedback loops?
• Assertion (A): In TE mode for rectangular waveguide. Reason (R): In TM mode for rectangular waveguide.
• The secondary constants of a line are
• To ensure that only dominant TE10 mode propagates in a rectangular waveguide, the operating frequency
• Z0 = (Zoc Zsc)0.5
• Characteristic impedance of a coaxial cable is inversely proportional to ∈r.
• The following components are used to measure power output of a 2 kW TWT amplifier TWT Low pass/High pass filter Low power 20 dB attenuator 40 dB directional coupler with matched load Power meter. The correct sequence of connections of these components is:
• Hollow waveguides are used as transmission lines at frequencies
• A rectangular wave guide has two stubs each of length connected at the source end. The stubs are circuited. Then the stubs present
• A 3 port circulator is in the given figure. Its scattering matrix is
• Integrated fin line can be utilized as a medium for constructing millimeter wave circuits.
• A line of length slightly longer than and open circuited at far end behaves as