Title :
Design of waveguide narrow-wall short-slot couplers
Author :
Hendrick, Louis W. ; Levy, Ralph
Author_Institution :
Hughes Aircraft Co., El Segundo, CA, USA
fDate :
10/1/2000 12:00:00 AM
Abstract :
It is shown that the broad-band coupling properties of narrow-wall short-slot directional couplers and hybrids are due to the effect of the evanescent TE30 mode in the coupling region. This causes a change to the effective phase length of the even-mode circuit, especially when a central tuning element is used. Using the results of a previous paper on the formation of an equivalent circuit from the generalized scattering matrix, an equivalent circuit for the even mode of the coupler is formed, clearly depicting the effect of the TE30 mode
Keywords :
S-matrix theory; directional couplers; equivalent circuits; tuning; waveguide couplers; broadband coupling properties; central tuning element; coupling region; directional couplers; equivalent circuit; evanescent TE30 mode; even mode coupler; even-mode circuit; hybrids; phase length; short-slot couplers; waveguide narrow-wall couplers; Antenna feeds; Circuit optimization; Coupling circuits; Directional couplers; Directive antennas; Equivalent circuits; Hybrid junctions; Scattering; Transmission line matrix methods; Waveguide junctions;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
