Today we have a simple ebook or manual that helps you in antenna measurement ,the book called Measurement of Antenna Radiation Patterns .To download it just click the word <<click here>> below ,i hope you enjoy it. 




<<click here>>

If you want to extend your wifi coverage  just watch this video and follow the steps and if you have any problem post a comment and i'll answer it as soon as possible
i hope you enjoy the video and learn new things

Here is an ebook  called Understanding Antenna Specifications and Operation , it is talking about antennas in general also it is written in basic English so i hope you enjoy it  and learn from it.
for any question just post a comment and i'll answer it as soon as possible  




>>click here<<

       How many time did you have a problem with receiving TV channels  because of the antenna of the TV so now you can build your own antenna by following these steps 

o    1

Look around the back of your television for two screws close together and the word "ant" nearby. It might fully spell out "antenna," but the abbreviation is more common.

o    2

Find a length of wire with a good gauge. The thicker the better. Make sure that the length of wire can reach from the back of your television to the nearest window.

o    3

Strip both ends enough to allow one end to wrap behind the screws. Affix the other end to the window frame, taping or nailing down the insulated part and leaving the stripped end free.

o    4

Secure the rest of the wire with tape, nails or another fixative to keep it from being an obstacle in the room.

o    5

Wrap the wire around a coat hanger or other piece of metal and place it on or near the television set, instead of using the window, as an alternative. This allows you to adjust the antenna more easily, but also makes it more necessary.



Read more: How to Build a Simple Antenna | eHow.com 

Today we will learn how to install a satellite dish so, we will watch this video and follow the steps.

In this video you will see and recognize the Array Antenna Fundamentals.

So as not to linger on you, leave you to watch the video, and in case of any queries you have, you can comment the end of the matter, let us watch the video.

This video demonstrates how to build a home radio tri-band 6 meter, 2 meter
& 70 cm yagi beam antenna using an old TV antenna for parts.

A simple design using dipole driven elements

A monopole antenna is a radio antenna that is one half of a dipole antenna combined with a right-angle ground plane of considerable length in place of its other half.

 

A dipole antenna has two halves, while a monopole antenna replaces one of the halves with an electrically conductive surface known as a ground plane, which behaves like the other half of a dipole antenna.

With a large enough ground plane, the monopole antenna can be as strong as a dipole antenna. Automobile antennas are a common example of a monopole antenna, with the metal of the automobile itself forming the ground plane.

A cross-sectional view of the antenna, clearly showing the upper frequency notches (side) and lower fequency notch (centre).
 
A coax of 75 Ohms is used to feed the antenna. The behaviour of the antenna can be easily investigated using CST MWS. Three configurations were simulated; With all notches present, with only the centre notch and with only the side notches.

The S-parameters for the 3 aforementioned cases are shown in this Figure .

As expected, the side notches contribute a high frequency mode with a low frequency mode results from the central notch.

The combined effect is shown in complete all-notches configuration.

The 3D Farfield plots at 4GHz and 4.78 GHz are shown in this Figure  with the polar forms in Figure 5.

These results correspond to those presented in [1] where simulated results were compared to measurements for a wide-range of antenna configurations.

This article summarises only a fraction of the work carried out in the [1] but does demonstrate the ability of CST MWS to simulate such structures.

CST MWS lends itself naturally to the simulation of UWB antennas since it enables the user to investigate their real Time Domain behaviour.

Other possibilities include CST DESIGN STUDIO™ (CST DS) which allows a co-simulation to be carried out of the UWB system. 

For a comparison between the measurement and simulated results, the reader is advised to consult [1] where the excellent agreement is shown.


Reference: http://www.wisegeek.com/what-is-a-monopole-antenna.htm

https://www.cst.com/Content/Applications/Article/Multiple+Band-Notched+Planar+Monopole+UWB+Antenna

In this topic, we'll show some pictures with explanations about small loop antenna.

The small loop antenna is a closed loop. These antennas have low radiation resistance and high reactance, so that theirtg impedance is difficult to match to a transmitter. As a result, these antennas are most often used as receive antennas, where impedance mismatch loss can be tolerated.

Loop-stick antenna

Ferrite core and multiple turns
Large radiation resistance
AM receiver

Reference: http://www.antenna-theory.com/antennas/smallLoop.php
                       http://www.slideshare.net/YongHeuiCho/loop-antenna

There are many websites detailing the construction of cantennas, all of them referring to a pigtail. A pigtail connects the antenna to the WiFi adaptor. However, any length of cable induces signal loss through impedance of the electromagnetic wave.

This cantenna design does away with the pigtail by using an n-type to reverse polarity male SMA adaptor. This adaptor connects your cantenna directly to a WiFi adaptor without need for a pigtail.

The microwave signal is processed in the adaptor so you can then use a long USB cable to connect from the WiFi adaptor to your computer without signal loss.

The cantenna is directional so you will need something like a tripod to direct and hold the cantenna in place. Expect about a 3dB improvement of the signal, which is roughly a doubling in power, and hopefully many more access points being revealed.

I won't go into detail about the construction of a cantenna but point you towardshttp://www.saunalahti.fi/elepal/antenna2.html for detailed measurements.

However, do look at the slide show to see the subtle difference that obviates the need for a pigtail.

Parts List:

High power WiFi USB adaptor with SMA connection for antenna ( I use an ALFA AWUS036H)
Can - over 76mm in diameter (Long and thin is better than short and fat)
N-type female chassis connector
N-type male to RPM SMA adaptor
Some thick unsheathed copper wire (about 1 to 1.5mm diameter mains wire is best)
Solder
Four small nuts and bolts to attach N-type female to can

Tools:

Drill and bits (cone bit to make hole for n-type chassis connector)
Soldering iron
Screwdriver
Wire cutters

You can see other self-reliant things I make and do at http://www.ecopunk.org.uk


reference: http://www.instructables.com/id/WiFi-Cantenna-without-pigtail/