Compact on-chip branchline coupler using slow wave transmission line
US8188808B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 2009 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Mar 26, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D84/811
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Branchline coupler structure using slow wave transmission line effect having both large inductance and large capacitance per unit length. The branchline coupler structure includes a plurality of quarter-wavelength transmission lines, at least one of which includes a high impedance arm and a low impedance arm. The high and low impedances are relative to each other. The high impedance arm includes a plurality of narrow cells and having an inductance of nL and a capacitance of C/n, and the low impedance arm includes a plurality of wide cells and having an inductance of L/n and capacitance of nC. The wide and narrow cells are relative to each other, and the wide and narrow cells are adjacent each other to form a signal layer having step discontinuous alternative widths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.