Circular Polarized Spiral Antenna with coverage from 300MHz to 3GHz+. Antenna is supplied with suction mounts for easy mounting.Designed by Hex and Flex in United Kingdom
This is an Ultra-wideband Log Spiral Antenna with a main frequency range of 300MHz to ~3GHz and beyond. The antenna is low-gain(omni-directional) circularly polarised. It is provided with an SMA co...Read More…
This is an Ultra-wideband Log Spiral Antenna with a main frequency range of 300MHz to ~3GHz and beyond. The antenna is low-gain(omni-directional) circularly polarised. It is provided with an SMA connector and suction mounts for attachment to RF transparent surfaces such as glass.
This antenna has been professionally measured by Antenna Test Lab in their 3D Anechoic Chamber. Results are shown below.
Dimensions :- 321mm x 227mm (12.6" x 8.9").
|90MHz to 200MHz||<3:1||not measured||not measured|
|400MHz to 2GHz||<2:1||0dBic to 4dBic||CP / < 10dB|
|900MHz to 3GHz||<1.5:1||-2dBic to 4dBic||CP / < 5dB|
|3GHz to 4GHz||<1.5:1||-4dBic to 0dBic||CP / < 5dB|
|4GHz to 5.8GHz+||<1.5:1||-7dBic to -1dBic||CP / < 9dB|
The antenna provides Left-Hand Circular Polarization in one broadside direction and Right-Hand Circular Polarization in the opposite direction. Marking is provided on each side of the antenna to show the direction of polarizations radiated in that direction. The animation below shows the azimuth beam pattern over frequency.
RHCP/LHCP Antenna Pattern Swept from 300MHz to 6GHz
This antenna is suitable for a wide range of applications. The supplied suction mounts make it particularly useful for occasions when it is not possible to erect a large outdoor antenna, or where an ad-hoc needs to be setup quickly.
Antenna mounted on window. Smaller antenna also available from my store
Antenna Gain and Axial Ratio
The antenna was designed and simulated in OpenEMS. This is an open source FDTD EM simulator. More info on how it was designed can be found on my blog.
Antenna design blog results
Antenna design blog modelling and simulation
Antenna design blog design choices
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