ANSWERS TO QUESTIONS Q1. THROUGH Q18.

A1. Operating principles and electrical characteristics.
A2. Power gain or power ratio.
A3. Standing-wave ratio (swr).
A4. Omnidirectional.
A5. Antenna directivity.
A6. Reciprocity.
A7. Parabolic.
A8. Light waves.
A9. One.
A10. Determine elevation.
A11. Vertical.
A12. Forces the radial segments of a wavefront into parallel paths.
A13. Some wavefronts are accelerated so that all wavefronts exit the lens at the same time.
A14. Delay lens.
A15. Antenna Array.
A16. Driven Array.
A17. Frequency or phase of radiated energy.
A18. Horizontal.