Details: Published: 09 January 2015; Hits: 33380

Helical resonator bandpass filter

The calculation is based on the method described in the book: "Handbook of Filter Synthesis, A.I.Zverev 1967 p.499-521", see more...

ENTER THE INPUT DATA:

f₀	= MHz	– Working frequency
ΔF	= MHz	– Bandwidth-3dB
α	= dB	– Admissible loss in the passband
R_i	= Ω	– Input impedance
R_u	= Ω	– Output Impedance

Calculate

RESULT:

Q_u	=	– Unloaded Q of the resonator
Z₀	=	– The characteristic impedance of the resonator [Ω]
α₀	=	– Estimated losses in the passband [dB]

d	= cm	– Diameter of the helix
b	= cm	– The length of the helix
S	= cm	– The width of the box shield
H	= cm	– The height of the box shield
τ	= mm	– The helix winding pitch
d₀	= mm	– The diameter of the wire
N	=	– Number of turns of the helix
tap_i	=	– Input tap (number of turns)
tap_u	=	– Output tap (number of turns)
h	= cm	– Helix above of shielding wall
K	= cm	– The height of shielding wall

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