A frequency selective improved directivity of a return loss bridge is achieved by generating a counteractive reflected energy vector to cancel a reflected energy vector caused by imperfections, such as parasitic effects and an unbalanced balun, in the return loss bridge. The counteractive reflected energy...http://www.google.es/patents/US6690177?utm_source=gb-gplus-sharePatente US6690177 - Frequency selective improvement of the directivity of a return loss bridge
Frequency selective improvement of the directivity of a return loss bridge
