 At high power , arcing can occur at the corners of the filter teeth due to strong electric fields being present at sharp corners . This limits the power @-@ handling capability of the filter . The effect can be mitigated by rounding the edges of the teeth . Completely circular teeth are best of all for power handling . Circular teeth will handle about 1 @.@ 4 times the power capability of square teeth without arcing . For instance Matthaei describes a 1 @.@ 2 – 1 @.@ 64 GHz passband filter with rounded teeth and a wide stopband with a power @-@ handling capability of 1 @.@ 4 MW . A similar filter with circular teeth , on the other hand , can handle 2 MW . Using power dividers to connect filters in parallel and then combining their outputs can provide even greater power handling . 
