RF test fixture for adaptive-antenna radio systems

Details RF test fixture for adaptive-antenna radio systems RF test fixture for adaptive-antenna radio systems

1998-10-14

2000-02-08

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Having branched circuits

324628, 343703, 455 671, H01P 512, H04B 1700

Patent

active

06023203&

ABSTRACT:
An RF-signal combiner-splitter comprises a microwave cavity that is intended to mix together radio signals in the 2.0 GHz spectrum. A hollow cylindrical metal tube with a volume of a few cubic feet to a few cubic yards is closed at one end and open at the other. Many RF-ports into the microwave cavity are provided at random positions that penetrate the hollow cylindrical metal tube. For example BNC-type bulkhead connectors with 10 dB attenuator pads are used with a 2 to 3 inch whip antenna inside the cavity volume. The attenuator pads brute-force an impedance match between the radio equipment under test and their corresponding RF-ports. The open end of the hollow cylindrical metal tube allows for the quick decay of RF-reflections that reverberate inside the cavity volume. Such open end is preferably directed toward nadir because interfering signals are generally minimum from that direction. In alternative embodiments, the cavity volume is partially filled with an RF-absorbing foam or other material to control reflections and limit the RF-energy within.

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