Re: NEC-LIST: Butler Matrix

At 09:35 PM 11/12/2005, zvi frank wrote:
>Hi All ,
> I have a question which is not quite clear to me. In a butler
>matrix antenna I know one can get narrow switched beams . Do these beams
>have the equivalent gain of the array ? I asked this because in theory
>if one would put a receiver on all outputs one would get a high gain in
>all directions which would seem to me against physics. Please any
>comments would be helpful?
> Zvi

The energy received from any given antenna is divided among all the beams.
So the total energy incident on all antennas is the same as the total
energy at the output of the matrix.

The beams have the directivity, but not the gain, of the array.

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James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875

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