• +1 919 200-0292
  • info@antennatestlab.com

Silly Antennas

Silly Antennas

Past Contest – Copper Tape Horn Extension December 12, 2020

The winner of this silly antenna “Guess The Gain Contest” was Stuart McAndrew (@ssshocker on Twitter) with his gain estimate of 12.1 dBi.

Have you ever thought about just lengthening a horn antenna to make it more directive (increase gain)? It’s certainly possible – theory and practice show that a horn’s gain is proportional to it’s aperture size. 

Well we did just that! A simple “down and dirty” copper tape extension was applied to this K-band WR42 standard gain horn antenna. The aperture size was increased by 4 times over the 15 dBi original size, and the flair angles were simply extended. The unmodified horn’s peak gain was measured at +15.6 dBi. So can we expect a 6 dB gain increase (4 x power from 4x aperture increase)?

Nope! Electrically large antennas like this horn that is multiple wavelengths across, need precise geometries to form directive plane waves needed for high gain/directivity. The hand formed copper tape was simply too “wonky” to be effective. In fact, it decreased the gain and distorted the pattern. Peak gain fell to +13.1 dBi. The swept frequency 3D gain plot movie below illustrates some of the pattern distortions.   

Past Contest – Whisky Antenna August 21, 2020

The winner of this silly antenna “Guess The Gain Contest” was @OmgZilla1 on Twitter who guessed the Glenfiddich scotch bottle gain as +10.1 dBic (our actual measured gain is +9.8 dBic). Full test results can be downloaded HERE.

Past Contest – “Cantenna” 13 dBi eBay WiFi Antenna May 5, 2020

The winner of this silly antenna “Guess The Gain Contest” was Robert Watson (@robert_watson on Twitter) who guessed the Cantenna gain as 6.2 dBi (our actual measured gain is 5.8 dBi) at 2440 MHz (WiFi band center). Full test results can be downloaded HERE.

The Cantenna eBay link is HERE. Enjoy the pictures below including the eBay “datasheet” claims.

Past Contest – Baguette Helix Antenna, February 10, 2020

The winner of this silly antenna “Guess The Gain Contest” was Stuart McAndrew (@ssshocker on Twitter) who guessed the gain exactly at 8.6 dBic. The antenna is RHCP (with an axial ratio is 0.5 dB) and has peak gain at 1500 MHz. Full test results can be downloaded HERE.

Want to see what’s going on? – Here is our Twitter feed.