The feed structure rather than altering the antenna geometry). Installation, it may be easier to add a stub m Hich is being used away from its design frequency. Here, we study a load formed by an antenna O consider stub matching it helps to have a practical example. So possible to design LC matching networks using the SMITH chart Terms of circuit theory, the stub and line may be regarded as a Sonator) the feed excites the resonance and the resonance
Higher than on the transmission line feed theĪves bounce backwards and forwards between the load and the far He voltages and/or currents in the matching section, whichĬonsists of the stub and the section of line betwĮ point of attachment of the stub and the load, may be much Open circuit, or short circuit, or indeed The stub needs to be nearly lossless it may be The length of the line, and the point ofĪttachment, both need to be calculated fromĪd impedance. (or in shunt with) the main transmission line Stub consists of a side section of line attached in series with Such a device can match any load at a spot Stub, connected to a hybrid tee junction, wĬalled an E-H tuner.
Waveguide, there is a special combination of series and shunt Then used in a completely analagous manner as an admittance Ore often stubs are used in shunt with the transmission line Of the SMITH chart in a simple series stub It is possible to cancel out thisflection by adding anĮqual and opposite reflection from a side arm or stub, at leastĮquency close to the design point. N unmatched load, on a lossless transmission line, generates a R the background to this page, please see the other stub Ingle-stub matching of transmission lines to loads
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