Custom Search

More than 10,000 searchable pages indexed.

Greetings: There is so much good stuff on RF Cafe that there is no way to list or link to all of it here. Please use the Search box or the Site Map to find what you want - there is a good chance I have it. Thanks!

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<
Job Board
About RF Cafe™
Copyright 1999-2015

Antenna design question... please help - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

 Post subject: Antenna design question... please help
Posted: Thu Nov 11, 2004 11:47 pm 
Can someone please help me with these questions?

1.Design a pyramidal horn antenna at 5775 MHz to offer a gain of 20 dB. You may assume any appropriate value for the wave guide dimensions.

2.For a gigabit wireless backhaul link ( LOS ), the data rate is 2Gbps. The frequency of operation is 11GHz. Suggest an appropriate antenna and substantiate your choice based on a comparison with other possible antenna structures.

3.Design a matching section ( patch / transmission line ) to match a 50 ohm source to 75 ohm load . You may use any of the freeware available on-line such as “AppCad” or “SMITH ” to do the matching.

 Post subject:
Posted: Fri Nov 12, 2004 9:20 am 
Sounds like a student assignment.

Now, if you were in a fraternity, you could just search the files for last year's solutions from your borthers. Fortunately for you, you're probably not a frat boy, so do yourself an even bigger service and figure these out on your own.

You might be asked something similar on an interview one day and it sure would be nice to know how to come up with the answers on your own.

Good luck - seriously. :)

 Post subject:
Posted: Wed Nov 17, 2004 11:11 am 

Joined: Mon Nov 15, 2004 4:08 pm
Posts: 3
Regarding the third one - try looking it up in Microwave engineering by Pozar, this and many other problems are solved and explained there.

2 - check some we sites of companies that produce antennas and substrats (like Rogers). Simply type "Wi-Fi" in the browser and you should find thousands of solutions.

3. The gain and frequency of a horn antenna depends on the dimensions of the aperture and the lenght of the horn. That should be your start point.

Best wishes and good luck

 Post subject: Antenna Design
Posted: Tue Nov 23, 2004 3:26 pm 
1) 6x8 inch aperture, 12 inches long.
2) Frequency scale the above antenna, or search google
3) incomplete question, no bandwidth, no spec.
Sounds like a homework assignment.

Posted  11/12/2012

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger… single-handedly redefining what an engineering website should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5th MOB: My USAF radar shop

Airplanes and Rockets: My personal hobby website

Equine Kingdom: My daughter Sally's horse riding website