Discussion
Why is the feed pattern of a reflector antenna designed to fall off towards the rim?
Answer: C
Energy that misses the reflector is lost and, worse, arrives from directions near the horizon where it picks up ground noise, so the feed is designed to illuminate the rim about ten decibels below the centre. The taper against spillover optimum follows. Mechanical loading is unrelated, cross polarisation depends on the geometry, and there is no impedance match between a feed and a reflecting surface. Controlling where the feed power goes is the whole art of feed design.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development