ECE :: Microwave Communication
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The directivity in a receiving antenna
- increases the intercept area in forward direction
- reduces the noise picked up from other sources
- provides a means of discriminating against undesired signals originating in directions other than in which the desired transmitter lies.
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Assertion (A): PIN diode can be used as attenuator and limiter.
Reason (R): PIN diode has a thin intrinsic layer.
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The bunching action which occurs in multicavity klystron amplifier can be represented by Applegate diagram
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The cut off wavelength in circular waveguide
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Consider the following statements
- Impedance of Gunn diode is about tens of ohms.
- Impedance of Impatt diode is a few ohms.
- Impedance of Impatt diode are of the same order.
- Impedance of Impatt diode is more than that of Gunn diode.
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In high frequency circuits impedance matching can be done by
- open circuited stubs
- short circuited stubs
transformer
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The directive gain of a transmitting antenna is proportional to
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In a loss line RL < Z0, then
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Assertion (A): A backward wave oscillator can be used as a sweep generator.
Reason (R): The frequency of oscillation of a backward wave oscillator can be changed by varying the voltage which controls the beam velocity.
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and is thus proportional to cross sectional area.
Since RL < Z0,