ImmersionRC 5.8GHz SpiroNET 13dBi Instruction Manual

1

ImmersionRC 5.8GHz SpiroNET 13dBi flat patch antenna

Instruction manual

Specifications

Typical impedance at 5.8GHz > 50 Ohm
SWR > <1.35 at 5.8GHz
Gain > 13dBic
Polarization > Left- or Right-hand circular (LHCP, RHCP)
Radiation pattern > 35-degrees vertical and horizontal
Configuration > Multi-element, phased, patch antennas
Dimensions (LxWxH) > 95x95x10mm
Weight (Grams) > 52 grams
Connector > SMA male

Fig 1.

www.immersionrc.com

ImmersionRC 5.8GHz SpiroNET RHCP patch antenna.

[e-mail]

Overview

The ImmersionRC 5.8GHz SpiroNET 13dBi patch antenna was developed to offer a high
gain alternative to its popular SpiroNET omni directional antennas. Using the
ImmersionRC 5.8GHz SpiroNET 13dBi patch antenna directly on a pair of video goggles
with built in 5.8GHz receiver, or mounted on a tripod, will easily triple to quadruple the
range versus the SpiroNET omni directional antennas. On top of that it offers the same
excellent multi-path rejection* not found in any other conventional patch antennas.

The principle behind this hinges on the use of circular polarization rather than linear
polarization. Circular polarization has the benefit that reflections change polarization and
see a natural attenuation of up to >20dB due to the polarization mismatch. This is an
effective means of canceling the negative effects of multi-path interference*.

ImmersionRC offers the same 5.8GHz SpiroNET 13dBi patch antenna in different
configurations, which from a specification point of view only differ from one another in
terms of Left- or Right-hand circular polarization. The different configurations however do
differ in terms of esthetics, i.e. they use different color plastic to distinguish one from
another. The different configurations are listed below:

White radome > Red cable > SMA male connector : Right-hand circular (RHCP)
White/black radome > Red cable > SMA male connector : Left-hand circular (LHCP)

Directions on use

In order to gain the most benefit from using ImmersionRC's 5.8GHz SpiroNET 13dBi
patch antenna the antennas on the transmitter and the receiver need to be of the same
polarization i.e. either both need to Right-hand or both need to be Left-hand polarized
and for the best results they should both be SpiroNET antennas.

The antenna on the model needs to be a SpiroNET omni directional antenna and should
be mounted as much vertical as possible whilst making sure that the antenna has free
'view' all around. Make sure that the antenna is not blocked by parts of your model, for
example the battery or parts of a carbon fiber frame, etc. In practice this means
mounting the antenna high up off of the center of your model, or from the tail or front,
alternatively the antenna can be mounted pointing down, as long as it is mounted
vertically.

On the ground the ImmersionRC 5.8GHz SpiroNET 13dBi patch antenna can be
mounted to the video goggles directly, using the built-in 5.8GHz receiver. Take note
however that the bulk of the gain is distributed in front of the antenna which has a beam
width, much like a flashlight, of about 35-degrees. It is essential to stay within this beam
to guarantee maximum range, or when flying through trees and bushes, maximum
penetration.

If your aim is to both be flying around yourself as well as far out, you either need to keep
turning your head towards the model, or opt for a ImmersionRC Duo5800 which will
allow you to use a SpiroNET omni directional antenna on one antenna input and the
SpiroNET 13dBi patch antenna on the other, where the receiver will always switch to the
one with the best signal.

2

www.immersionrc.com

[e-mail]