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Antenna reception theory
Hi,
I am looking for an explanation of how an antenna receives a signal due to the E-field of an electromagnetic wave. I have looked in some books, and can understand transmission, but the books I have looked in don't explain reception. I have found an explanation of how the H-field induces a signal in a loop antenna: a changing magnetic flux will induce a current. But what about the E-field and a dipole antenna? I guess that the E-field causes electrons to move in the antenna wire, because in a solid conductor, electrons will move until the E-field inside the solid is cancelled out? I have googled but having difficulty finding a good explanation. Any pointers? Thanks & regards, Paul. -- Remove _rem_ before replying by email. |
#2
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Antenna reception theory
"Paul Taylor" wrote in message news Hi, I am looking for an explanation of how an antenna receives a signal due to the E-field of an electromagnetic wave. I have looked in some books, and can understand transmission, but the books I have looked in don't explain reception. I have found an explanation of how the H-field induces a signal in a loop antenna: a changing magnetic flux will induce a current. But what about the E-field and a dipole antenna? I guess that the E-field causes electrons to move in the antenna wire, because in a solid conductor, electrons will move until the E-field inside the solid is cancelled out? I have googled but having difficulty finding a good explanation. =================================== It is impossible for an E-field to exist without an H-field. Therefore, antennas of all sorts receive signals in the same way as a simple loop. Calculations can begin using either the E-field or the H-field but they both give the same answer. ---- Reg. |
#3
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Antenna reception theory
Reg Edwards wrote:
It is impossible for an E-field to exist without an H-field. Must have been before electrostatics was invented. :-) ac6xg |
#4
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Antenna reception theory
Jim Kelley wrote:
Reg Edwards wrote: It is impossible for an E-field to exist without an H-field. Must have been before electrostatics was invented. :-) ac6xg How do you make an electrostatic radio wave? 73, Tom Donaly, KA6RUH |
#5
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Antenna reception theory
Tom Donaly wrote: Jim Kelley wrote: Reg Edwards wrote: It is impossible for an E-field to exist without an H-field. Must have been before electrostatics was invented. :-) ac6xg How do you make an electrostatic radio wave? 73, Tom Donaly, KA6RUH Certainly you're aware that radio waves don't have a monopoly on E fields, Tom. 73, jk |
#6
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Antenna reception theory
Jim Kelley wrote:
Certainly you're aware that radio waves don't have a monopoly on E fields, Tom. But they should have a monopoly on threads in this newsgroup. :-) -- 73, Cecil http://www.qsl.net/w5dxp |
#7
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Antenna reception theory
Tom Donaly wrote:
Jim Kelley wrote: Reg Edwards wrote: It is impossible for an E-field to exist without an H-field. Must have been before electrostatics was invented. :-) ac6xg How do you make an electrostatic radio wave? Wave to it first? - 73 de Mike KB3EIA - |
#8
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Antenna reception theory
"Jim Kelley" bravely wrote to "All" (28 Nov 05 11:52:53)
--- on the heady topic of " Antenna reception theory" JK From: Jim Kelley JK Xref: core-easynews rec.radio.amateur.antenna:220506 JK Reg Edwards wrote: It is impossible for an E-field to exist without an H-field. JK Must have been before electrostatics was invented. :-) Yes, but you are changing the topic into static fields. We were discussing changing electric fields, not statics but dynamics! A*s*i*m*o*v .... "Hey, I'm just this guy, see?" --Zaphod Beeblebrox |
#9
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Antenna reception theory
Asimov wrote:
Yes, but you are changing the topic into static fields. We were discussing changing electric fields, not statics but dynamics! When is someone going to come up with a context-free language? -- 73, Cecil http://www.qsl.net/w5dxp |
#10
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Antenna reception theory
Asimov wrote: "Jim Kelley" bravely wrote to "All" (28 Nov 05 11:52:53) --- on the heady topic of " Antenna reception theory" JK From: Jim Kelley JK Xref: core-easynews rec.radio.amateur.antenna:220506 JK Reg Edwards wrote: It is impossible for an E-field to exist without an H-field. JK Must have been before electrostatics was invented. :-) Yes, but you are changing the topic into static fields. We were discussing changing electric fields, not statics but dynamics! But do you agree that it's not impossible for an E field to exist without an H field? ac6xg |
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