Introduction Ideal Choke - Karinya

IntroductionBaluns can be difficult components to analyse and understand fully; however it's possible to get a good basicunderstanding of how they operate by treating them as combinations of idealised common-mode RF paper uses that method to explore the advantages and disadvantages of some of the common baluns used by Radio ChokeThe schematic of a typical Choke is shown in Drawing 1. The Choke comprisestwo windings a-c and b-d that have the same number of turns and share acommon flux path. Typically the windings will comprise a bifilar pair or a length ofcoaxial cable; in the case of coax, a-c might be the centre conductor and b-dthe braid. The Choke is used in transmission line mode - in other words a signalis applied between terminals a-b and appears as an output at terminals Ideal Choke will have the following properties: P1: It is lossless, and the winding length is very small compared to a wavelength, so Vcd=Vab. We will refer to this as the Differential-Mode voltage applied to the Choke .

B) 1:1 Voltage Balun Drawing 4 shows our unbalanced RF source connected to the load through a 1:1 voltage balun. The important feature of this balun is that a third (tertiary) winding (c-b) has been added to the choke with the

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