WIDEBAND IMPEDANCE Matching for Quectel BG95-M3 Mini,

[jose_practicante]

Hi, i am new into the topic of impedance matching, i want to match an antena for the Quectel BG95-M3 Mini in a wide frecuency range. I am trying to get a good matching for the following bands:

Band 28 (705.531 MHz a 747.993 MHz),
Band 26 (814.052 MHz a 848.981 MHz)
Band 5 (824.088 MHz a 848.977 MHz)
Band 2 (1 850.048 MHz a 1 909.984 MHz)
Band 4 (1 710.064 MHz a 1 754.978 MHz)
Band 66 (1 710.044 MHz a 1779.983 MHz)

is there a way for me to get a good impedance matching in this wide range that is aprox from 700 MHz to 1910 MHz?, i have been reading books about impedance matching but they only talk about matching networks for specific frecuencies and i have seen some yotube videos where they do impedance matching and they generate diferent peaks of resonance in diferent frecuencies and they get the following answers:

but the explanations are not detailed and i have not found any book or course that explains how to do this.
the antena that i am using is the W3796. i attached the datasheets for the antena and quectel that i am using.

i also have a network analyser and i performed the reflexion S11, and transmision thests S22 and i got the following results with out using any matching networks.

does anybody knows what to do in this situations?

 

[BigBoss]

A microstrip Line with a approx. 20 Ohm , lambda/4 length will bring this impedance to center of Smith Chart @ 1.7325 GHz.
Find exact value of Zo by applying lambda/4 Impedance Matching Circuit. This technique does not cover a wideband range, but it might give also a reasonable matching over bandwidth.

 

[jose_practicante]

thank you, but do you of any technique for matching the impedances in a wider range?

 

[BigBoss]

thank you, but do you of any technique for matching the impedances in a wider range ?

You should draw Q Lines on Smith Chart then you can use this technique consecutively to reach 50 Ohm in a desired wideband.
There will so be multiple cascaded Quarter Line Impedance Matching Circuits, and this will give you a reasonable matching.