There are several options: as indicated above, you can use any non-linear device like a diode or a transistor and adjust it to generate harmonics, then use a filter to reject all unwanted harmonics.
One interesting device is a parametric tripler, using a step-recovery diode. Such tripler often operates over a narrow frequency band but offers a quite high efficiency.
If you need to multiply the wide band you gave, please see "www.minicircuits.com", they have low-cost commercial triplers for such purpose. There are other manufacturers, too.