New answers tagged antenna
5
votes
How could most mobile device antennas not lose signal even if their s11 goes above -10 dB quite often in daily use?
1 Textbooks did tell you that as an antenna designer, you should try to make s11<-10dB. Textbooks didn't tell you antennas can also work at s11=-1dB. It's just an efficiency loss. At s11=-3dB, ...
- 174k
0
votes
Measurement of s11 of differential output antenna transmitter
The answer to your question highly depends on the situation, especially on the balanced side.
If both conductors on the balanced side do have a high degree of isolation towards GND, then you can e.g. ...
- 7,803
1
vote
Left and right circularly polarized antennas - which one to choose for reception-emission?
The antennas should be wound in the same direction, which is to say they have opposite polarization, since polarization of an antenna is defined according to what you see when looking down the ...
- 278
1
vote
How can I add an external antenna to a GooSKY S1 mini helicopter flight controller?
The people who designed the RF module will have done the best job they can within the constraints of the size and placement. Unless you know what you’re doing and have access to the right equipment, ...
- 7,865
3
votes
Can a microwave antenna detect single microwave photons?
An antenna doesn't detect anything: it delivers electromagnetic energy to a receiver. So your question really should be "can a microwave receiver detect single microwave photons".
The answer ...
- 4,987
10
votes
Can a microwave antenna detect single microwave photons?
No, the system cannot distinguish individual photons.
A single photon at, say, 10 GHz has an energy of about 6.62607015×10−24 J.
A barely-detectable radio signal has a power of about 1 femtowatt, or ...
- 178k
7
votes
Accepted
Can a microwave antenna detect single microwave photons?
No, microwave antennas cannot "detect" (and I'm using "detect" as a very loose euphemism... It's really "conversion"...) microwave photons because their energies are too ...
- 1,886
Top 50 recent answers are included