This brief deals with the improvement of jammer suppression for adaptive br
oadband beamforming. The analysis is carried out with a two-microphone Grif
fiths-Jim Beamformer and a single jammer signal. By examining the derived o
ptimal filter, a design strategy for the constant target-signal filter in t
he main channel of the adaptive beamformer is given. This leads to a substa
ntial reduction in the required filter length of the adaptive filter, while
maintaining the same jammer suppression. Furthermore, a faster rate of con
vergence can be achieved, as there are fewer filter coefficients that have
to be adapted. The brief concludes with measurement results from a real-tim
e implementation of an adaptive beamformer, showing that the proposed desig
n method is effective, even when more than two microphones are used.