Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
1999-08-26
2001-05-29
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S829000, C343S846000
Reexamination Certificate
active
06239750
ABSTRACT:
The present invention relates to an antenna arrangement for multi frequency band operation, comprising a first radiator element for operation in a first frequency band and a second radiator element for operation in a second frequency band, wherein said second element is arranged in a different plane from said first element. The invention also relates to an array antenna arrangement comprising groups of first and second elements. Also, the invention relates to the use of such an antenna arrangement.
BACKGROUND
A large number of base station antenna installations have been necessary for the operation of cellular mobile telecommunication systems. Base station antenna arrangements have to be provided all over the area that is to be covered by the cellular communication system and how they are arranged among other things depends on the quality that is required and the geographical coverage, the distribution of mobile units etc. Since radio propagation depends very much on terrain and irregularities in the landscape and the cities the base station antenna arrangements have to be arranged more or less closely.
However, the installation of multiple antenna base stations has caused protests among others from an esthetical point of view both on the countryside and in the cities. Also, the construction of these antenna masts is expensive, e.g. because each antenna needs to be supplied with energy via a separate, expensive feeding cable.
The introduction of new base station antenna arrangements would be considerably facilitated if the infrastructure that already is in place could be better used. Today various examples of microstrip antenna elements which are capable of operating in two distinct frequency bands are known. However, it is difficult to avoid grating lobes when the frequency bands are not closely spaced.
SUMMARY
An object of the invention is therefore to provide a multi frequency band antenna which does not present the above described problems. Another object of the invention is to provide an antenna which operates with different polarization states.
For these objects, the antenna arrangement in accordance with the invention is characterized in accordance with the accompanying independent claims.
Advantageous embodiments of the invention are described in the accompanying depending claims.
It is an advantage of the invention that the existing infrastructure already provided for the 800 or 900 MHz frequency band can be used also for new frequency bands such as about 1800 MHz or 1900 MHz. It is also an advantage of the invention that the antenna elements or the radiating elements are simple and flexible and enables a simple feeding etc. It is also an advantage that dual polarization states can be supported with a high mutual insulation.
REFERENCES:
patent: 4903033 (1990-02-01), Tsao et al.
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patent: 5300936 (1994-04-01), Izadian
patent: 5307075 (1994-04-01), Huynh
patent: 5680144 (1997-10-01), Sanad
patent: 5952971 (1999-09-01), Strickland
patent: 0 207 029 (1986-12-01), None
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patent: 95/07557 (1995-03-01), None
patent: 98/37592 (1998-08-01), None
Burns Doane Swecker & Mathis L.L.P.
Nguyen Hoang
Telefonaltiebolaget LM Ericsson (publ)
Wong Don
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