Transcription of Coaxial Traps for Multiband Antennas, the True Equivalent ...
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Coaxial Traps for Multiband Antennas, the True Equivalent ...
Nov/Dec 2004 19 Watzmannstr, 24AD-85586 POINGG ermanyCoaxial Traps forMultiband Antennas, the true Equivalent CircuitBy Karl-Otto M ller, DG1 MFTA new perspective on the analysis anddesign of this popular antenna antenna DesignParallel-resonant circuits (calledtraps) are widely used to isolate partsof Multiband antennas to make theantenna resonant on different fre-quencies (see Fig 1). For more than 20years these circuits have been imple-mented as coils wound from ,2,3 As shown in Fig 2, the in-ner conductor of the coil end is con-nected to the outer conductor at thebeginning. Therefore the current isgoing around the core two times thenumber of turns. The Coaxial cablecapacitance represents the capacitorof this parallel-resonant circuit.
Nov/Dec 2004 19 Watzmannstr, 24A D-85586 POING Germany Coaxial Traps for Multiband Antennas, the True Equivalent Circuit By Karl-Otto Müller, DG1MFT
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