Szczepan Bialek wrote:

"Ian Jackson" napisal w wiadomosci
...
In message , Szczepan Bialek
writes



"The wire antennas used with crystal receivers are monopole antennas

The words "almost always, almost every time, almost invariably and almost
without exception" are missing.

As crystal receivers are normally used at low frequencies (long and medium
wave), the obvious antenna to use is an end-fed long wire monopole. This,
of course, requires a ground.

However, in principle, you could use a (probably large) dipole, provided
you modified/designed the circuit of the receiver so that it would take a
balanced input (which would probably also be low impedance).

I'm pretty sure that some of the early radar receiving systems used
essentially a dipole antenna feeding a crystal receiver.

You are right:
"A simple rectenna element consists of a dipole antenna with a diode
connected across the dipole elements." And:
"A nantenna is a very small rectenna the size of a light wave, fabricated
using nanotechnology, which acts as an "antenna" for light,"

Each rectenna arm (or dipole element) must be shorter then 1/4 WL.

But: "Where the electrons come from?
S*

The same as any other antenna; they are always in the conductor and don't
"come" from anywhere.

The voltage developed at the antenna terminals causes the electrons in
the conductors to move.

You are an ignorant, babbling, ineducable idiot who knows absolutely
NOTHING about how anything works.

An antenna is a device that converts the AC electrical energy at it's
teminals into electromagnetic energy which radiates from the antenna
and also coverts the electromagnetic energy which antenna intercepts
into AC electrical energy at it's terminals.

How many antennas have you built in your lifetime?

Why do you refuse to answer the question?

Is it because you have built zero antennas and you are trying to say all
the people that have successfully built hundreds that they are all wrong
and you don't want to admit you are an ignorant, inducable, idiot?

Why can't you obtain and read a university level textbook on anything
in any language?

Is it because you are too stupid to be able to understand the material?