A small portable directional ultra-wideband Palm Tree Vivaldi Antenna with coverage from 800MHz to 6GHz+Designed by Hex and Flex in United Kingdom
This antenna was tested at Antenna Test Lab, an independent antenna testing company, the full result can be found here This is an Ultra-wideband Palm Tree Vivaldi Antenna. This antenna provides goo…Read More…
This is an Ultra-wideband Palm Tree Vivaldi Antenna. This antenna provides good gain from about 1.7GHz through to at least 6GHz(possibly higher). Above 1.7GHz the antenna provides directional gain. Below this frequency the antenna pattern is less defined, but still usable in many situations. The Palm Tree Vivaldi antenna uses unique corrugations in the radiating arms to improve forward gain. The original concept was developed by Dr. Alexandre and his team at Laboratory Maxwell in Brazil and published in IEEE.
The antenna provides an excellent SWR of less than 2.5:1 from 1.7GHz.
Antenna measures 90mm x 156mm x 1mm (excluding SMA)
Supplied with SMA connector.
I designed this antenna as a cheap multipurpose antenna for use primarily with SDR radios such as the HackRF/BladeRF/RTL Dongle/LimeSDR/Airspy etc etc. I wanted something small and portable that I could always have in my bag ready to investigate signals at whatever frequency I wanted.
For a really portable tool, this antenna can be used with a smartphone running RF Analyzer or SDRTouch and either a cheap (~$20) RTL Dongle or a HackRF.
The antenna suitable for both Receive and Transmit (please play nicely with the spectrum). It can be used for the following bands and more.
I have created a blog that details aspects of the design and performance of this antenna. See here
I have designed some simple Tripod Mounts to fix pairs of antenna to a standard camera tripod. The files for this can be freely downloaded from Thingiverse Small cheap tripods are readily available from Amazon. If you do not have a 3D printer you can select the appropriate product option and I will send you a high quality 3D printed ABS antenna mount with appropriate mounting screws.
The video below shows a demonstration of using this antenna with a HackRF to inspect two 5MHz wide 3G(UMTS) signals at 2.1GHz. In this video I switch from using a generic telescopic antenna (mounted on a ground plane) to the Vivaldi antenna. The Vivaldi antenna provides about 6dB better performance.
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