HIGHLIGHTED-Microwave-Communications.pdf

Indicate the false statement when the free space

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546. Indicate the false statement. When the free- space wavelength of a signal equals the cut-off wavelength of the guide a. The group velocity of the signal becomes zero b. The phase velocity of the signal becomes infinite c. The characteristic impedance of the guide becomes infinite d. The wavelength within the waveguide becomes infinite 547. A disadvantage of microstrip with respect to stripline circuits is that the former a. Do not lend themselves to printed-circuit techniques b. Are more likely to radiate c. Are bulkier d. Are more expensive and complex to manufacture 548. In order to couple two generators to a waveguide system without coupling them to each other, one could not use a
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a. Rat-race b. E-plane T c. Hybrid ring d. Magic T 549. A PIN diode is a. A metal semiconductor point-contact diode b. A microwave mixer diode c. Often used as a microwave detector d. Suitable for use as a microwave switch 550. For handling high powers, the best transmission medium is a. Stripline b. Microstrip c. Rectangular waveguide d. Coaxial line
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