滤波器设计实例（电子科技大学）

filter_material滤波器设计
贾宝富

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设计实例-3
波导滤波器设计举例

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波导滤波器设计举例 波导滤波器设计举例
设计参数： f0 = 15.35 GHz BW= 32 MHz S11 < -20 dB S21 < -40 dB @ f0 ± 40 MHz

滤波器从 14.9到 15.35 GHz连续可调 BJ-140波导技术参数： a=15.8mm; b=7.9mm; 工作频率范围： 11.9~18GHz
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Filter Filter with with inductive inductive posts posts
设计参数：

BJ-140

f0 = 15.35 GHz BW= 32 MHz S11 < -20 dB S21 < -40 dB @ f0 ± 40 MHz

滤波器从 14.9到 15.35 GHz连续可调

Z0

K01

K12

K23

K34

K23

K12

K01

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step step 1: 1: Prototype Prototype filter filter
f0 BW IL RL

1a) Obtain low-pass prototype parameters (gi) from filter specifications (see e.g. Matthaei*)
g2 g0 g1 g3 g4 gn-1 gn

gn+1
6th order Chebychev filter prototype elements g0 = 1.0000 g1 = 0.8836 g2 = 1.3966 g3 = 1.7894 g4 = 1.5528 g5 = 1.6095 g6 = 0.7667 g7 = 1.1524

Example: f0 = 15.35 GHz BW= 32 MHz S11 < -20 dB S21 <