144 reputation
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location India
age 46
visits member for 1 year, 5 months
seen May 12 at 7:11

Jul
2
awarded  Curious
Dec
29
comment Is there any antenna with a single null?
I was looking for exactly zero power (not merely very low power). Even a single frequency will do.
Nov
18
revised The far $\vec{\mathrm{E}}(\vec{\mathrm{r}},t)$ field of an arbitrary antenna given an arbitrary input current $I(t)$
added 55 characters in body
Nov
17
revised The far $\vec{\mathrm{E}}(\vec{\mathrm{r}},t)$ field of an arbitrary antenna given an arbitrary input current $I(t)$
added 14 characters in body; edited title
Nov
16
asked The far $\vec{\mathrm{E}}(\vec{\mathrm{r}},t)$ field of an arbitrary antenna given an arbitrary input current $I(t)$
Nov
16
comment Is there a differential equation that can represent a circuit with an arbitrary voltage source connected acrorss an antenna?
Thanks @WetSavannaAnimal this is great. I was looking for what happens to an arbitrary antenna anyway -- what happens for specific antenna designs are generally well known. This answers my question completely.
Nov
16
accepted Is there a differential equation that can represent a circuit with an arbitrary voltage source connected acrorss an antenna?
Nov
16
comment Is there a differential equation that can represent a circuit with an arbitrary voltage source connected acrorss an antenna?
@AlfredCentauri ... unfortunately, that relation would only for short dipoles. For a small loop, we get $R_r \propto \lambda^{-4}$ ... and for a large dipole, it mutates to a large expression in $\lambda$, as shown here
Nov
15
comment Is there a differential equation that can represent a circuit with an arbitrary voltage source connected acrorss an antenna?
I am aware of the expression for radiation resistance of the dipole -- but you'll notice that it contains $\lambda$, which pre-supposes a sinusoidal excitation. I was wondering if there was any way to way to deal with this entirely in the time domain
Nov
15
asked Is there a differential equation that can represent a circuit with an arbitrary voltage source connected acrorss an antenna?
Nov
12
revised Equivalent circuit for an arbitrary receiving antenna
added 224 characters in body
Nov
12
comment Is there any antenna with a single null?
@user23660 did you mean it is possible or isn't possible? If you mean isn't, my question is -- is it essential for radiation emitted from an antenna in all directions to have identical polarizations?
Nov
12
asked Is there any antenna with a single null?
Nov
12
revised Equivalent circuit for an arbitrary receiving antenna
edited body
Nov
12
comment Equivalent circuit for an arbitrary receiving antenna
Thanks @ArtBrown - I am also cautious about that $\cos \psi$ because of the same reason.
Nov
12
accepted Equivalent circuit for an arbitrary receiving antenna
Nov
11
revised Effective aperture of isotropic antenna
deleted 99 characters in body
Nov
11
revised Equivalent circuit for an arbitrary receiving antenna
added 216 characters in body
Nov
11
revised Equivalent circuit for an arbitrary receiving antenna
added 124 characters in body
Nov
11
answered Equivalent circuit for an arbitrary receiving antenna