Discussion
What is the effect of moving a reflector feed along the axis away from the focus?
Answer: C
Axial defocusing puts a quadratic phase error across the aperture, which broadens the beam, fills in the nulls and reduces the gain without any steering. It is sometimes done deliberately to spoil a beam for search purposes. Lateral movement is what steers, side lobes rise rather than fall, and polarisation is not improved. Recognising a quadratic phase error by its signature of a broadened beam with filled nulls is a useful diagnostic on any aperture.
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