US 4,063,249 AGranted

Small broadband antenna having polarization sensitive reflector system

AssigneeLicentia Patent-Verwaltungs-G.m.b.H.

InventorsArmin Bergander, Georg Kurz

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Abstract

A broadband antenna system of small dimensions and composed of at least one antenna having an associated design operating frequency, and a plurality of reflectors operatively associated with the antenna and disposed at respectively different distances therefrom, each reflector being spaced from the antenna and having a reflection characteristic to be optimally matched with the antenna for operation at a respective partial frequency band, each reflector being associated with a different partial band such that the total operating frequency range of the system is divided into a plurality of partial bands equal in number to the number of reflectors and covering the design operating frequency range and a further frequency range below the lower limit of the design range, whereby the antenna characteristics are improved, and in particular the operative bandwidth of the system is increased in the low frequency direction.

Claims10

Dependent claims

A broadband antenna system of small dimensions comprising:

an antenna having a frequency dependent polarization characteristic and an associated design operating frequency range;
and a plurality of reflectors operatively associated with said antenna and disposed at respectively different distances therefrom, each said reflector being spaced from said antenna and having a reflection characteristic to be optimally matched with said antenna in a manner to enable said system to be operative over a respective partial frequency band at least that reflector which is closest to said antenna being polarization selective, each said reflector being associated with a different respective partial band and having a polarization corresponding to the polarization of said antenna at frequencies within its respective associated partial band, at least one of said reflectors being associated with a partial band extending to a frequency below the lower limit of the design operating frequency range, such that the total operating frequency range of said system is divided into a plurality of partial bands equal in number to the number of said reflectors and covering the design operating frequency range and a further frequency range below the lower limit of the design operating frequency range;
whereby the antenna characteristics are improved and particularly the operative bandwidth is enlarged in the low frequency direction.

Dependencies are inferred from the claim text.