Magnetic Field Strength Antenna Reception Range

[Padawan]

Does the strength of the electromagnetic field that an antenna emits control how far it can recieve radiation from?

 

Furthermore, are there limits on the range that an antenna can recieve from if you increase the magnetic field?

 

If you were to increase the amount of power in an antenna, 100 fold, for the purposes of recieving radiation, would you be able to absorb radiation, 100 times farther?

 

Is there a maximum amount of power you could put in an antenna, where once you reach a limit, you can no longer get any farther range?

 

Please respond.

 

Thanks!

[swansont]

The reception will be based on a power threshold. That correlates to distance only if other factors, like transmitted power, are held constant.

[YT2095]

there is a Max power yes, I`v seen the base coil on a Sigma 4 actually Glow red using a 500w linear amp on SSB!

so yes, there is a limit

also the range is dependent on the radiated field geometry, a dipole for example will give a toroid (dounut) shaped field, whereas an Ant with a good db gain will be like an upside down flat topped tree, and when you get in Yagi types it`s almost a Ray.

Co-phasing can help too.

[Padawan]

Thanks guys!

 

 

The reason I ask, is because I have an idea for how to make an antenna that could absorb ultraviolet radiation, or infrared radiation, and I'm thinking that if I could simply increase the amount of power in the antenna, I could increase the range, which would absorb more power, which would give me more power to send out to absorb more power and so forth and so on.

 

Hopefully, I could sell electricity for a living, and just work on antennas while I finish up becoming an electrical engineer.

 

Again, Thanks a million!

[YT2095]

Well... the sort of antennas spoken of in here deal with wavelengths ranging from centimeters down to several Kilometers, when you get into mili, micro, nano meter ranges you need an entirely different sort of antenna, things like Waveguides and Optical stuff.

[Mr Skeptic]

Sorry young Padawan, but to receive much more energy from electromagnetic waves you will need your receptor to cover much more surface area. Putting more power into an antenna, you can transmit farther away, or amplify weaker signals. Though you can receive some power from transmissions, like in batteryless radios, it is a small amount and unlikely to pay for the costs of making the antenna.