antenna-theory.com Forum Index antenna-theory.com
Antenna Theory
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Search found 13 matches
antenna-theory.com Forum Index
Author Message
  Topic: Basic VSWR question
slk23

Replies: 3
Views: 11189

PostForum: Questions Related to Antenna Theory   Posted: Sat Aug 23, 2014 7:12 pm   Subject: Basic VSWR question
Thanks for the reply. I'm still struggling to understand but making some progress.

In Wikipedia standing wave ratio (SWR) is the ratio of the amplitude of a partial standing wave at an antinode (m ...
  Topic: Basic VSWR question
slk23

Replies: 3
Views: 11189

PostForum: Questions Related to Antenna Theory   Posted: Thu Aug 14, 2014 4:30 pm   Subject: Basic VSWR question
One thing I've been pondering about return loss testing and VSWR: if standing waves are present on the transmission line, where one measures on the line affects the result, correct? I mean, there coul ...
  Topic: Slot antenna as a circle
slk23

Replies: 1
Views: 7231

PostForum: Questions Related to Antenna Theory   Posted: Wed Jun 25, 2014 12:05 am   Subject: Slot antenna as a circle
Sorry, I can't answer your questions about a circular slot antenna.

To picture the radiation pattern and polarization of a linear slot antenna, visualize the slot and dipole antennas placed next to ...
  Topic: Slot antenna
slk23

Replies: 5
Views: 15895

PostForum: Questions Related to Antenna Theory   Posted: Mon Jun 09, 2014 7:36 pm   Subject: Slot antenna
Thanks for the reply bigSteve.

The slot antenna I made has a female BNC but I could easily change it to SMA.

I will take some measurements to see if there's space in the installation for a lamb ...
  Topic: Project Loon Antennas Explained
slk23

Replies: 2
Views: 15811

PostForum: News   Posted: Sun Jun 08, 2014 10:16 pm   Subject: Project Loon Antennas Explained
More on the antenna, explaining the reason for the stacked patch antennas: cross-polarization.

https://www.youtube.com/watch?v=iFUjp495gUA&list=UU85vZzdL-PEn_5hl8_FDHoA
  Topic: Slot antenna
slk23

Replies: 5
Views: 15895

PostForum: Questions Related to Antenna Theory   Posted: Sun Jun 08, 2014 4:42 pm   Subject: Slot antenna
Yesterday I built a 1090 MHz transponder slot antenna as best I could with information found on the web. However, the only ground plane I have available on this fiberglass composite airplane is a sma ...
  Topic: Slot antenna
slk23

Replies: 5
Views: 15895

PostForum: Questions Related to Antenna Theory   Posted: Sat Jun 07, 2014 6:59 pm   Subject: Slot antenna
Hello,

I'm going to try making a I would keep the arms shorter than a half-wavelength - maybe closer to 0.46 lambda without a balun, just from experience (resonance typically occurs as less than a ...
  Topic: Cutting-edge science and potatoes enable Wi-Fi advance
slk23

Replies: 0
Views: 12121

PostForum: News   Posted: Wed Oct 02, 2013 9:25 pm   Subject: Cutting-edge science and potatoes enable Wi-Fi advance
[]

[url=https://www.youtube.com/watch?feature=player_embedded&v=9oeXDgEJm2c#t=144]Boeing's cutting-edge science and potatoes enable Wi-Fi advance

[]
  Topic: How does this antenna work?
slk23

Replies: 2
Views: 8674

PostForum: Questions Related to Antenna Theory   Posted: Mon Sep 16, 2013 6:20 pm   Subject: How does this antenna work?
Interesting.... I did some poking around on the web and this appears to be a [url=http://en.wikipedia.org/wiki/J-pole_antenna]J-Pole antenna. The overall length matches but the parallel wire is a bit ...
  Topic: Coaxial Dipole
slk23

Replies: 6
Views: 26511

PostForum: Questions Related to Antenna Theory   Posted: Mon Sep 16, 2013 4:56 pm   Subject: Coaxial Dipole
Thanks for the comments Steve. I shortened it to 0.46 lambda and appears to work very well: my transponder was replying to received interrogation signals at the same rate or better than it did with t ...
  Topic: How does this antenna work?
slk23

Replies: 2
Views: 8674

PostForum: Questions Related to Antenna Theory   Posted: Mon Sep 16, 2013 4:30 pm   Subject: How does this antenna work?
This antenna was provided to me for use with a 978 MHz receiver. Can anyone explain the purpose of the 'wires' and connections near the feed point? I assume it's a balun but I don't understand how it ...
  Topic: Coaxial Dipole
slk23

Replies: 6
Views: 26511

PostForum: Questions Related to Antenna Theory   Posted: Fri Sep 13, 2013 6:03 pm   Subject: Coaxial Dipole
Thanks for the reply. I should have been more specific -- my question was really about impedance matching and whether a coaxial dipole needs a balun. I'm also curious about the The G4CQM 50Ω co ...
  Topic: Coaxial Dipole
slk23

Replies: 6
Views: 26511

PostForum: Questions Related to Antenna Theory   Posted: Wed Sep 11, 2013 12:23 am   Subject: Coaxial Dipole
Do coaxial dipoles really work well without any impedance matching? For example: http://www.hamuniverse.com/bazooka.html
The arms are quarter-wavelength except the inner wire is shortened to account ...
 
Page 1 of 1
All times are GMT
Jump to:  


Powered by phpBB © 2001, 2005 phpBB Group