Luigi IZ7PDX made this filter. It is a bandpass centered at 450 MHz that Luigi will use as an IF filter.
![](https://www.albfer.com/wp-content/uploads/2022/01/f_1.jpg)
![](https://www.albfer.com/wp-content/uploads/2022/01/f_2.jpg)
Luigi characterized the filter using ADALM-PLUTO and SATSAGEN.
![](https://www.albfer.com/wp-content/uploads/2022/01/f_3.jpg)
![](https://www.albfer.com/wp-content/uploads/2022/01/f_4.jpg)
![](https://www.albfer.com/wp-content/uploads/2022/01/f_5.jpg)
Luigi has further improved the input and output impedance of the filter by acting on the coupling links and measuring with a vector antenna Analyzer:
![](https://www.albfer.com/wp-content/uploads/2022/01/f_6.jpg)
![](https://www.albfer.com/wp-content/uploads/2022/01/f_7.jpg)
![](https://www.albfer.com/wp-content/uploads/2022/01/f_8.jpg)
![](https://www.albfer.com/wp-content/uploads/2022/01/f_9.jpg)
Find Luigi IZ7PDX on: - Youtube channel - Site
It is an excellent job, to take off your hat as we say here(para sacarse el sombrero), many congratulations, greetings from Peru.