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,,,and a dipole beer-can..

Franklin Cantenna

DVB-T Cantenna

The quad antenna consists of a square loop of wire as shown in the figures below . The side of the loop is approximately lambda/4 in length and it is normally fed with 50-- 75*lambda coaxial cable at the point shown. The loop can be mounted with a diagonal vertical and fed at the bottom corner; in either case the feed point is a current maximum and the performance is identical. In the configuration shown, the polarisation is horizontal. If fed from the side of the loop, the polarisation will be vertical.

A mimo antenna has two ports, one inputs and one output, by definition. The isolation is a measure of how well the ports are separated from each other in terms of unwanted signal coupling. 30dB isolation is in most cases considered 'high isolation'. Leakage or feed thru is the terminology of the unwanted signal coupling.

When an antenna has 2 ports the port-to-port isolation and cross-polarisation discrimination can be specified. Antennas with 2 or more ports are typically used in technologies that deploy MIMO (multiple-input multiple-outputs). MIMO is a technique that is used to improve the data throughput of a system by making use of multiple channels at the same carrier frequency each of which carries separate data. For this reason, the port-to-port isolation and cross-polarisation discrimination are parameters that should be published. The port-to-port isolation is defined as the ratio between the power fed into one port of the antenna to the power received at the other port. It is therefore an important parameter to consider if the antenna is to be used with a transmitterthat makes use of MIMO. Ideally one would like the two ports to be completely independent (infinite isolation) because then what ever signal is transmitted from one port will not interfere with the signal transmitted from the other port. The lower the isolation, the more interference there will be between the two transmitted signals

,,,simple dipole antenna...

some data...

Congratulations ... very good work Andrew77....!!!!!!!!!!!!! it must to have made adapting impedance...!!

Excuse me, but I don"t understand what you want to post here .. !! Can you refer to something like this...!!! ,,,or like this...

Galvanized sheet 0,3-0,4mm Another kind of power supply via coaxial cable Version of REMO.

Biquad Construction

To take full advantage of MIMO (currently used in 4G LTE communications) two antennas must be used. When installing directional antennas like a panel antenna, the first antenna must be rotated horisontally to a 45 degree angle and the second to a 135 degree angle. This is because of "polarisation diversity". LTE uses polarisation diversity to help distinguish between the two data streams sent from the tower. This MIMO panel antenna for 3G has the advantage of good isolation between the two ports.

The radiant element is made on PCB this antenna is better than this...

Yes, this parasitic disc can be applied but only at helical antenna with 3...5 coils or at least reduced by 70-71%.!

,,,a biquad antenna on PCB(10,5dBi) and panel antenna with 4biquad(16.5dBi)... The Best ....!!!

,,,by Oveco ... When used with the WiFi adapter Alfa AWUS036H managed to keep the relationship at a distance of more than 10 nautical miles (18.5 km). Features Wi-Fi antennas AP-15m: * Operating frequency band: 2.4 GHz * Gain: 15 dB * Angle of the main lobe: 30\30 degrees * Weight: 0.75 kg * Dimensions (without mount): 20х20х2см * Crosspolarization: -30dB * Antenna efficiency: more than 90% * 2m cable included, SMA connector * The antenna has a swivel mount on the tube with the wing nuts

a practice of execution by Starik0...

Another variant of the plug.