First of all , please remember:
Baluns will not improve SWR (the exception is where a balun used as part of a matching network,
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The balun should do only two jobs.
1.Isolate transmission line
2.Provide balanced output current
Proper balun designs
A properly engineered balun will include these design points: High winding inductance (reactance) and Low stray capacitance. Very short internal transmission lines- << 1/4 wave (remember: the shorter the better). High power components- High voltage wire and insulation to withstand high power or a mismatch. Large wire gauge reduces I2R losses. Large cores because help to prevent saturation and provide the necessary high inductive reactance values on the low bands.
Balun designs considerations
High choking reactance, 250Ω minimum
(limits low frequency response)
Low stray capacitance
(limits high frequency response)
Short transmission line, << ¼ wave
(The shorter, the better)
High power handling
Minimize resistive losses
Correct core selection
Robust mechanical design
Line Impedance, Z0
For 1:1 make equal to load and line impedance
For 4:1, make geometric mean of line and load impedance (e.g., 50Ω to 200Ω requires 100Ω line)
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———-I suggest you to watch this nice video on BALUN designs – click down here on the arrow—–