MULTI-POWER AND MULTI-FREQUENCY HIGH DIRECTIVITY DIRECTIONAL COUPLER
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2002-Jan-23
This invention starts with a standard microstrip direc- tivity. This coupler which uses multiport feed lines tional coupler. Additional sections are then added to allow resolves the issue of degraded performance by termi- for more coupling. For couplers which arc terminated nating the lines with loads which compensate for the in the characteristic impedance of the transmission lie, additional lines and actually enhances the directivity. Fig- the addition of sections would degrade the performance ure 1 shows the layout for a 5 port coupler. It should be of the coupler in terms of return loss, coupling, and direc- noted that the number or legs on the coupler can vary.