Five-Stub Directional Device with Substantially Reduced Overall Dimensions

In this paper, a compact design of a five-stub microstrip coupler with significantly reduced overall dimensions has been investigated. To reduce the size, an artificial transmission line was used, with equivalent characteristics at a central operating frequency of 1000 MHz and in its vicinity, with the characteristics of an even-wave-length segment. Using the program of electrodynamic modeling AWR DE, a standard and compact coupler design was simulated. Due to the fact that the artificial line is shorter and the protruding elements are located, so that to maximally use the free space of the coupler without crossing with neighboring conductive lines from other lines, it was possible to reduce the area of the traditional coupler by 70% in relation to the area of the standard design, while the reduction in the band of operating frequencies occurred by 10%.