Use disableRipple as an attribute to disable ripples for the md-tab-group as Angular2+ using the Angular material.
Just simply do something like this:
<md-tab-group disableRipple></md-tab-group>
Also if you are using the latest Angular Material, it’s a little bit different like this below:
<mat-tab-group [disableRipple]="true"></mat-tab-group>