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HF Antenna matching device
| Details |
Inventors: Cheze, Rene;
Assignee: Thomson-CSF (Paris, FR)
Primary Examiner: Gensler; Paul L.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
An antenna matching device comprises a directional coupler and, respectively connected, in a prior art manner, to two conjugate ports of the directional coupler, one of which is a high-power port, and the other of which a low-power port, a matching circuit in series with the antenna to be matched, and a matched load. A switching device makes it possible, during the matching phase, to reverse the connections of the aforementioned ports and thus to substitute the directional coupler low-power path for the high-power path in the link between the transmitter and the antenna. |
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DETAILED DESCRIPTION What is claimed is: 1.
A HF antenna matching device comprising: a directional coupler having first and second pairs of conjugate ports, said first pair having first and second ports, said second pair having a high-power port having a given coupling coefficient with said first port and a low-power port having a lower coupling coefficient with said first port, said first and second ports being adapted for respectively coupling to signal generating means and to measuring means during a matching phase a controllable matching circuit for being controlled as a function of the indications of said measuring means during a matching phase; a matched load; and a switching device for coupling the matching circuit to the high-power port and the matched load to the low-power port during a communication phase and vice versa during a matching phase.
2.
A HF antenna matching device as claimed in claim 1, wherein said measuring means form part of the matching device and comprise a phase comparator circuit having two inputs respectively coupled to said second port and to said low-power port.
3.
A HF antenna matching device as claimed in claim 2, wherein said control means also comprise: a voltage reducer circuit having an output and an input coupled to said signal generating means and whose reduction ratio is made equal to said lower coupling coefficient; and a voltage comparator circuit having two inputs respectively coupled to the output of said voltage reducer circuit and to said low-power port.
Description:
The present invention relates to a H.
F.
antenna matching device which makes it possible to very substantially reduce radiation from the antenna during the matching phase.
Throughout this description as well as in the claims, the concept of pairs of conjugate ports has been used in relation to n dB directional couplers; the term pair of conjugate ports of the coupler is intended to signify two of the four parts of the coupler such that, if matched loads are connected there, there is virtually no coupling between the other two ports of the coupler; the other two ports also constitute pairs of conjugate ports
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