Directional radio wave receiver.

I am working on a project for which i need a directional radio wave receiver which can receive the radio waves of coming from specific direction.

It would be grate if someone could help me out regarding this.

What frequency and bandwidth is the receiver working at,
cheers,
Richard

The band frequency is 40 meters or 7 MHz.

Ouch, not so easy. Radio amateurs typically working in this region use yagis, but they are very large, around 20m wide, by however long you can make it to get better directivity.
Since you don't give any clue as to what sort of directivity you need (beam wide in degrees), it is hard to say how many directors you would need on the yagi. Biggest issue would be mechanical engineering to get reasonable stability out of the antenna assembly.
Look up radio amateurs web sites for yagi antenna at this frequency,
cheers,
Richard

Hi Richard and Vivek,

How's it going?

I remember we made a Yagi-uda antenna for a project in our microwave and antennas class, but the frequencies were for TV.
I think 10m [wavelength divided by 4?] will be the longest requirement?
The following directors will be shorter than that.

AM in the Philippines is ranged at 535-1635 kHz, and is successfully received by a length shorter than that [maybe because the transmitters are powerful].

So if you're having problems with reception, may higher amplification will do the trick.

Just sharing.

Regards,
Justin

Hi Justin,
Thanks for your reply.
I need a complete set of receiver and transmitter which could efficiently work on a band width of 40 m or 7 MHz.
The band width could be upto 50 meter but not less than 40.
The receiver should be directional I.e. It should receive the waves coming from one direction and should neglect the waves coming from any other direction.

It would be grate if you could help me out in this.

Hi everyone..i am new to this forum. I think you should try the Yagi-uda antenna.I think 10m [wavelength divided by 4?] will be the longest requirement?The following directors will be shorter than that.
AM in the Philippines is ranged at 535-1635 kHz, and is successfully received by a length shorter than that [maybe because the transmitters are powerful.