Directivity tuning of microstrip couplers

Author

Müller, Johannes ; Pham, Nhat M. ; Jacob, Arne F.

Author_Institution

Inst. fur Hochfrequenztech., Techn. Univ. Hamburg, Hamburg, Germany

fYear

2012

fDate

12-14 March 2012

Firstpage

1

Lastpage

4

Abstract

A method for tuning the directivity of directional couplers by simultaneously adjusting the phase velocity and the impedance level of the coupler is presented. It is shown that by using three symmetrically positioned capacitors, the solution of the compensation problem is under. Here, the additional degree of freedom is used to compensate the effect of typical manufacturing tolerances. A theory for the compensation with three capacitances is developed. Experimental proof is provided with a conventional mechanical tuning scheme. Measurement results show good performance, thus confirming the approach.

Keywords

capacitance; capacitors; compensation; electric impedance; microstrip directional couplers; microwave circuits; tuning; coupler impedance level; directional couplers directivity; manufacturing tolerances; mechanical tuning scheme; microstrip couplers directivity tuning; phase velocity; three symmetrically positioned capacitors; Capacitance; Dielectrics; Directional couplers; Impedance; Nonhomogeneous media; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference (GeMiC), 2012 The 7th German

Conference_Location

Ilmenau

Print_ISBN

978-1-4577-2096-3

Electronic_ISBN

978-3-9812668-4-9

Type

conf

Filename

6185147