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Currently, at AP side, we use a Lucent made 10 dBi omni antenna, connected to AP itself.

Here is a view of the AP antenna mount, in the middle of an 18 meters high TV and radio tower.


As far as individual node configuration is concerned, several antennas have been build and tested. Following, a comprehensive set of constructions and installations is presented.

Here is a design of a promising antenna.

Dim: 80 x 80 x 61 (mm)
Gain: 8 dBi
FB ratio: > 40 dB
Beamwidth > 45o
S11: -20 dB to -25 dB at 2.35GHz
The case is made of aluminum 2mm thick.

When removing the case, and adding a metal back you get:
Dim: 70 x 74 x 2 (mm)
Gain: 10 dB
FB ratio: > 40 dB
By moving metal back 3mm away, you get 1.5 dB more.
The metal back is made of aluminum 2mm thick.

An array of 4 elements has been simulated providing:
Dim: 200 x 100 x 5 (mm)
Gain: 15 dB
FB ratio: > 40 dB
Beamwidth > 50o
More accurate results will follow.

All constructions were made using FR4 board 1mm thick, and the connector was of N-type.
Design, simulation and testing (at qualified EMI labs) made by Nick (ee9nt) and Vivi.


Ready made commercial parabolic grid. Tests shown 24 dBi (against Lucent 24 dBi parabolic grid). SV3BSF is preparing a 810 modified-for-outdoor-use on the mast.


PWN1's 810 and parabolic grid combination, beaming towards the AP.



This is an easy made, easy transport, good performer: the double eight pcb. The gain is 13 dBi, measured against Lucent 24dBi parabolic. Click for larger image, containing size details.


A side view of the antenna. Note the rigid cable in use, and the way the N-type connector is attached to it. BSF can build one for you.


An older version of the double eight. The gain is 12 dBi (approx.), measured against Lucent 24dBi parabolic.


For this version, use Heliax to mount the radiating element (2 mm thick enamelled Cu wire with 29 mm inner dimension for each side of the rectagulars). Heliax 1/2" cable. Heliax is soldered on both sides of the reflector (double sided pcb-oriented board 200 mm X 170 mm), keeping radiator 15 mm apart.


This is a side view of the double eight antenna.



A set of antennas: omni (5dBi), D8 pcb and feeds.


Feed for parabolic designs.


Rear feed for parabolic designs.



A simple, yet efficient, mounting bracket for the Stelladoradus grid antennas.
A couple of images of the mounting bracket in action.



The 14dBi (33 Degrees both vert. and hor.) SuperPass directional panel antenna (SPLG22) used in several occasions (i.e at our portable measuring unit , LinuxRules mast). It seems to consists of 8 closed loop dipoles (approx. 320 Ohm each) in phase, binding together with microstrip match lines.

Note that the outer of the rigid cable, on its way to the N-type connector, touches the back metal plate, namely the reflector (not shown here).

This anttenna is highly recommended when this gain is desirable, and the price is right!



Great feed solution!. This is a BiQuad feed, and "blame" Trevor Marshall for this. Slightly modified, a "spacer" 15 mm tall keeps the gap between radiator and reflector ("hot silicon glue" is used). A short RG-174 ended to a N-type female was used for testing.


The box, as shown in devices page, will be connected right to the end of the holding cylinder, and the thin RG will be soldered directly on the client's pcb. The feed will "light" a surplus 100 cm X 90 cm offset dish. Early tests shown 22 dBi (against Lucent 24 dBi parabolic grid). Maximum EIRP, although ETSI (proposing EN 300 328) might disagree...



A corner reflector with 60 degrees angle.


Heliax holds the dipole, as well as feeds the N-type female connector to the back. Tests shown 12 dBi (against Lucent 24 dBi parabolic grid).



A simple dipole feed. Good solution to illuminate parabolic constructions (solid, grid etc.)


Heliax holds the dipole, as well as feeds the N-type female connector to the back. Tests shown 4 dBi (against Lucent 24 dBi parabolic grid).