Antenna Horn

[nine_c1]

Do you have a link to some of those equations? I can only find ones for 34ghz yagis and those are kinda small to be practical I'd like to do some math and come up with a few small estimates on size and experiment with a few designs. A little trial and error, and accounting for known weaknesses, for what my purposes are I think it will at least be a worth while practical education and application of more advanced radar theory.

Here is a very good write up on theory and design for a 2.4 GHZ horn antenna. The same principles and theories would apply.......just use different figures for whatever frequency you want to optimize your design for.

http://www.engr.sjsu.edu/rkwok/projects/horn_B.PDF

It will give you an idea of the complexity involved when it comes to designing a good but simple horn antenna. The horns in our RDs are quite a bit more complex in design with the Ridge(s) and multiple flare angles in some being added for improved bandwidth.

[pipinos1976]

Go to:

Antenna Design Associates

and download pcaad 2.1

It's a free dos based program that can simulate different antennas such as the horn antennas you want.

You can enter the size of the horn, the frequency and then you have the gain.

We used it this year at the university with great success. The students loved it because it's simple and can create diagrams.

You can use it to find the gain from the antennas of different RDs on different frequencies. I believe that with this program we can explain the small differences between 34,7 and 35,5 GHz Ka band.

Thnx for your time.

[nine_c1]

Go to:

Antenna Design Associates

and download pcaad 2.1

It's a free dos based program that can simulate different antennas such as the horn antennas you want.

You can enter the size of the horn, the frequency and then you have the gain.

We used it this year at the university with great success. The students loved it because it's simple and can create diagrams.

You can use it to find the gain from the antennas of different RDs on different frequencies. I believe that with this program we can explain the small differences between 34,7 and 35,5 GHz Ka band.

Thnx for your time.

OK........so I was wrong!

It seems there is a simple application out there to do ANYTHING these days!

Even so......I don't think this is going to help us create the perfect horn extension to attach to the existing horns in our RDs. If your building something from the ground up..........a definite aid!

I plugged a few numbers in and made some wild looking patterns but I'm going to have to dust off the text books to figure out what the heck I'm doing here.

Very nice find and Thanks for posting it here.

[WDG]

If the RD is mounted where what it "sees" reflected from the hood is down the road, and instead of a complete external horn you have only the top panel of the four, that might help capture more of the signal from down the road without affecting off-axis. In other words, the hood and panel would be acting as a large "collector."

Thoughts?

[€]

Hello people!
I'm renewing the topic.

Here is a good comparison of Standard Unit / Horn Extension Unit performance on a very hard to detect photoradar Ramet AD9 (low powered Ka 34.00 GHz, radar antenna extremely low by the ground). Since radar beam is 22 degrees to the road, detector needs to have good off-axis sensitivity to catch it, because signal doesn't hit antenna directly but rebounded from the sides of the road (buildings, poles, etc.).

The Unit is Escort X50 EURO.

Test 1

X50E Std (Radar towards the detector):
[ame="http://www.youtube.com/watch?v=VDy4UNvMfR0&feature=player_embedded"]YouTube - X50 EURO vs AD 9 (horyzontal) najazd[/ame]
X50E Std (Radar towards the opposite direction):
[ame="http://www.youtube.com/watch?v=i1rUVLZSpFY&feature=player_embedded"]YouTube - X50 EURO vs AD 9 odjazd (horyzontal)[/ame]

X50E HornExt. (Radar towards the detector):
[ame="http://www.youtube.com/watch?v=f8oTIIyuyi8&feature=player_embedded"]YouTube - X50 EURO Monster - wersja wzmocniona (horyzontal) vs AD 9 ul. Kamie?skiego[/ame]
X50E HornExt. (Radar towards the opposite direction):
[ame="http://www.youtube.com/watch?v=oDSHRCsaiUA&feature=player_embedded"]YouTube - X50 EURO Monster wersja wzmocniona vs AD9 odjazd (horyzontal)[/ame]

Test 2

X50E Std (Radar towards the detector):
[ame="http://www.youtube.com/watch?v=ykbZNLDn3Ok&feature=player_embedded"]YouTube - X50 EURO vs AD9 (horyzont)[/ame]
X50E Std (Radar towards the opposite direction):
[ame="http://www.youtube.com/watch?v=JH0xjlYL9js&feature=player_embedded"]YouTube - X50 EURO vs. AD 9 odjazd[/ame]

X50E HornExt. (Radar towards the detector):
[ame="http://www.youtube.com/watch?v=ct26ImF7Ukw&feature=player_embedded"]YouTube - X50 EURO Monster vs AD 9[/ame]
X50E HornExt. (Radar towards the opposite direction):
[ame="http://www.youtube.com/watch?v=3c6A90qmP30&feature=player_embedded"]YouTube - X50 EURO Monster vs. AD9 odjazd[/ame]

Test 3

X50E Std (Radar towards the detector):
[ame="http://www.youtube.com/watch?v=XKTy9FFZ4pE&feature=player_embedded"]YouTube - P1090617.MOV[/ame]
X50E Std (Radar towards the opposite direction):
[ame="http://www.youtube.com/watch?v=5khQ5hbMm2s&feature=player_embedded"]YouTube - P1090618.MOV[/ame]

X50E HornExt. (Radar towards the detector):
[ame="http://www.youtube.com/watch?v=I-l9u0sBkJ4&feature=player_embedded"]YouTube - P1090619.MOV[/ame]
X50E HornExt. (Radar towards the opposite direction):
[ame="http://www.youtube.com/watch?v=rq9iXCGmzbg&feature=player_embedded"]YouTube - P1090620.MOV[/ame]

Summary:

Test 1
X50E Std: 135m, 80m
X50E HEx: 225m, 105m

Test 2
X50E Std: 220m, 155m
X50E HEx: 350m, 165m

Test 3
X50E Std: 195m, 35m
X50E HEx: 350m, 140m

The Horn Extension is not even so large, app. 5,5 cm of the lenght:



And the opponent - Ramet AD9 C (car inbuilt version):



Thank you wksek and piotreg for completing these great tests!

[nosbusa]

Interesting..

What are these horns made out of?

[€]

Interesting..

What are these horns made out of?

Carton, aluminum foil, duct tape and 30 minutes of work.
The result may shock you!

[nosbusa]

I have all the above supplies. I may try it out it.

[nosbusa]

Interesting..

What are these horns made out of?

Carton, aluminum foil, duct tape and 30 minutes of work.
The result may shock you!

Well I ended up making one. LOL

I guess I made it a little big on the opening part that butts up to the RD.

Mine's big enough to where you can fit the 8500S7 just inside the horn extension. I guess it will still work?

[€]

Well I ended up making one. LOL

I guess I made it a little big on the opening part that butts up to the RD.

Mine's big enough to where you can fit the 8500S7 just inside the horn extension. I guess it will still work?

I can't promise but of course you should try. People learn from mistakes

The best way to make really working H/E is to measure size of the original horn aperture (for S7 it is 2.9cm x 1.25cm, if I remember well), design that end of a H/E with the same dimmensions, and match it exactly to original antenna.

If you don't want to demolish unit's housing, make those dimensions little bigger (for instance 3.1cm x 1,4cm) and stick H/E to the detector's front shield 1,4cm from left side of RD's front and 0,6cm from the bottom.

Please don't let me do all the work for you, because you loose such a fun