Patent ID: 6342861
Filing Date: 2002-01-29
Classification: H01Q

Abstract:
A loop antenna assembly for the transmission or reception of electromagnetic energy comprising:at least one support structure; a driven loop antenna element having an electrical length for use on at least one frequency within a selected range of frequencies having a geometric configuration installed on said at least one support structure and being coupled to a transmission line for the transmission or reception of electromagnetic energy to or from said loop antenna assembly; an additional loop antenna element having an electrical length which is greater than approximately 5% different from said electrical length of said electrical length of said driven loop antenna element for use on the same said at least one frequency within the same said selected range of frequencies, defining a selected difference in said electrical length between said elements, and installed on the same said at least one support structure at a selected distance from said driven loop antenna element, said additional loop antenna element having a geometric configuration, the geometric configuration of at least one of said driven loop antenna element and said additional loop antenna element being non-equilateral and structured and arranged to deliver approximate maximum coincidence of approximate maximum forward gain and approximate maximum front-to-back ratio wherein a change in the difference in electrical lengths between said driven loop antenna element and said additional loop antenna element compensates for a change in said selected distance between said driven loop antenna element and said additional loop antenna element to maintain said approximate maximum coincidence of said approximate maximum forward gain and said approximate maximum front-to-back ratio, said selected difference in said electrical length between said driven loop antenna element and said additional loop antenna element being a function of said selected distance between said driven loop antenna element and said additional loop antenna element to maintain said approximate maximum coincidence of said approximate maximum forward gain and said approximate maximum front-to-back ratio, for use on said at least one frequency within said same selected range of frequencies.