Microwave Communication Questions

• Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have
• The most commonly used magnetron is
• Assertion (A): For a reciprocal microwave junction the S matrix is symmetrical. Reason (R): In a symmetrical matrix Sij = Sji.
• In a waveguide the dielectric region is generally
• Which part of radio spectrum is more crowded?
• In the given figure the equivalent circuit of a T attenuator. If the condition for matched attenuator is
• In microwave circuits, a mode transducer is used to
• Slotted line can be used for measurement of high frequencies
• Which of the following is not used as a microwave mixer or detector?
• Radar principle is used in
• Which one of the following is also called 'rat race'?
• A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.
• Assertion (A): A line of length slightly more than and open circuited at far end is equivalent to an inductive reactance. Reason (R): A line of length slightly more than and short circuited at far end behaves as a capacitive reactance.
• In TE mode of waveguide Ez = 0
• The speed at which axial electric field due to signal advances in a TWT is equal to
• A line of length slightly less than and short circuited at far end behaves as
• In directional coupler of the given figure, the terms |S14| and |S23| of scattering matrix are nearly
• Depth of penetration does not depend on frequency.
• Assertion (A): Slotted line is frequently used for microwave measurements. Reason (R): The unknown impedance is mounted at the end of slotted line.
• Assertion (A): Inter-digitated geometry is widely used for microwave transistors. Reason (R): Tuning at input and output of transistor uses MOS chip capacitors.