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Log in| Search found 5 matches |
| Author | Message |
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 Topic: What is the type of antenna with the highest forward gain |
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| chaicustard Replies: 1 Views: 7635 |
 Forum: Questions Related to Antenna Theory Posted: Tue Mar 26, 2019 11:12 pm Subject: What is the type of antenna with the highest forward gain |
| a) is correct.
Note that the Parabolic antenna may have lower gain than yagi, if BOTH have a gain below about 8-10 dB, AND are of SIMILAR size. Tp put it another way, Parabolic dish has to be large ... |
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| Topic: Multiple antennas in parallel. |
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| chaicustard Replies: 3 Views: 9642 |
Forum: Questions Related to Antenna Theory Posted: Tue Mar 26, 2019 12:55 am Subject: Multiple antennas in parallel. |
| I like to think of an antenna as a transformer that idealy converts 50 ohms to 377 ohms ( impedance of air).
A single length of 1/100th wavelength cant do this, BUT we can always at some RF componen ... |
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| Topic: Dipole antenna in a liquid |
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| chaicustard Replies: 6 Views: 10855 |
Forum: Questions Related to Antenna Theory Posted: Tue Mar 26, 2019 12:42 am Subject: Dipole antenna in a liquid |
| Lambda in water could be up to 1/10th that of that in air.
https://en.wikipedia.org/wiki/Relative_permittivity https://www.allaboutcircuits.com/tools/wavelength-tem-calculator/ Everything is sca ... |
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| Topic: Passive Repeater |
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| chaicustard Replies: 6 Views: 10480 |
Forum: Questions Related to Antenna Theory Posted: Tue Mar 26, 2019 12:10 am Subject: Passive Repeater |
| 300 ohm line probably wont work well due to losses at 2.4 GHz. It doesnt like being near any other metal, and may even radiate a little
Personally, If short on antenna-making suppies , Id consider th ... |
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| Topic: RF coil design |
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| chaicustard Replies: 3 Views: 21223 |
Forum: Questions Related to Antenna Theory Posted: Tue Feb 23, 2010 10:55 am Subject: Where's the energy going? |
| This seems an unusual situation ( for typical RF circuits). My first thought is this: are you designing to somehow absorb the energy sent into the coil (S11) ? If S11 is low, then power flows in, but ... | |
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