I'm starting to study RF propagation at college, and I'm thinking about what antenna I should choose for this scenario:

The distance between the transmitter and receiver is just 700 meters, and the link is not line-of-sight because there are 2 buildings in the way.

The frequency is 408.01250 Mhz and the bandwidth will be 12.5 Khz FM.

Do you think a 1/2 wavelength dipole (omnidirectional) will work for this? Or would a Yagi (directional) be better? I think that a Yagi would oversize the link?.

Which one of these antennas would be the best choice?

Thanks in advanced !!!

 

You don't tell us the needed information about the TX power. If it is 500mW or more, then a 1/2 wave will work at 700 meters.

 

Yeah will be more than 500mW, much more.

Even with the building path loss?

 

And sorry the job frecuency will be 408.00625 Mhz (UHF)

 

Are there any buildings(same size or larger).....close to the inline buildings?

 

Are there any buildings(same size or larger).....close to the inline buildings?

No, the rest of the buildings are small

 

You can run a quick Link Budget check. I see a received power of :-59.28 dBm using 1/2 wavelength dipoles, your numbers (power, frequency, distance) and 3db for each loss (tx, misc, rx)
https://www.pasternack.com/t-calculator-link-budget.aspx

 

Ok thanks u very much is solved