F-35 Luneburg lens radar reflector
- Enthusiast
- Posts: 52
- Joined: 05 Apr 2019, 18:06
The design of the cap may be to vary the gain based on angle of incoming radar instead of just adding a fixed amount of gain in all directions. If the cap was rotatable then it would prevent any true mapping of the stealth profile of the plane.
Also a guess that the notches may be tuned for specific frequencies of radar. A manufacture has this to say about Luneberg reflectors have a homogeneous response over a wide angle;
The Luneberg reflector gives an homogeneous response inside a wide angle. It is an ideal passive responder, perfect for highlighting, and eventually monitoring the radar target to which it is attached, with a high level of security.
The Luneberg lens is the most efficient passive radar reflector available.
The Luneberg reflector requires no power supply nor maintenance.
Also a guess that the notches may be tuned for specific frequencies of radar. A manufacture has this to say about Luneberg reflectors have a homogeneous response over a wide angle;
The Luneberg reflector gives an homogeneous response inside a wide angle. It is an ideal passive responder, perfect for highlighting, and eventually monitoring the radar target to which it is attached, with a high level of security.
The Luneberg lens is the most efficient passive radar reflector available.
The Luneberg reflector requires no power supply nor maintenance.
Some moar loony info hear: viewtopic.php?f=59&t=53294&p=378255&hilit=ewssa#p378255
- Elite 5K
- Posts: 5184
- Joined: 13 Mar 2013, 08:31
- Location: Finland
falcon.16 wrote:what frequencies work a luneberg lens? i think only in short waves...
They can work in any possible frequency. You can make Luneburg lens for any frequency, but naturally they have best effect at some frequency range. But Luneburg lens is pretty wideband in any case and nothing stops using several of them to cover wider frequency range.
notkent wrote:The design of the cap may be to vary the gain based on angle of incoming radar instead of just adding a fixed amount of gain in all directions. If the cap was rotatable then it would prevent any true mapping of the stealth profile of the plane.
Also a guess that the notches may be tuned for specific frequencies of radar. A manufacture has this to say about Luneberg reflectors have a homogeneous response over a wide angle;
The Luneberg reflector gives an homogeneous response inside a wide angle. It is an ideal passive responder, perfect for highlighting, and eventually monitoring the radar target to which it is attached, with a high level of security.
The Luneberg lens is the most efficient passive radar reflector available.
The Luneberg reflector requires no power supply nor maintenance.
Kinda looks like the guts of an old Xband cavity magnatron.
https://en.wikipedia.org/wiki/Cavity_ma ... iagram.png
Daddy why do we have to hide? Because we use VI son, and they use windows.
Attached via broken link: 2013 4th edition Electronic Warfare and Radar Systems Engineering Handbook 455 page PDF.
- Attachments
-
- EW 2013 Warfare NAWCWD TP 8347.pdf
- (6.46 MiB) Downloaded 3606 times
zhangmdev wrote:Unlikely. Ejecting those things in-flight could strike the vertical tails.
Plus you'd have to give the poor old maintainer a parachute one hopes.
- Active Member
- Posts: 140
- Joined: 16 Feb 2012, 16:44
- Location: Washington State
It is quite obvious thae metallic device in the hole has a hinge bolt and rotates outbound through the slot in the cover.
Seems to me we need to be looking for a picture of the device not just "installed" on the jet, but in actual "use."
Seems to me we need to be looking for a picture of the device not just "installed" on the jet, but in actual "use."
Who is online
Users browsing this forum: No registered users and 4 guests