Coplanar Hybrid Coupler
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Coplanar Lumped Element 180o Hybdir Coupler

The example documented here is a 4-port hybrid consisting of "ideal" lumped elements like inductors and capacitors. This type of circuit is applicable for balanced mixers for example. The complete schematic representation is given in Figure 9-10. Figures 9-11 shows the layout of the circuit. Most of the circuit is built in level 2 in order to keep the losses low (in the default foundry level 1 has a smaller thickness than the level 2). The results are plotted in Figure 9_12.

Figure 9-10. Schematic of the 180o Coupler with Lumped Element Figure 9-11. Layout of the 180o Coupler with Lumped Element
Figure 9-12. Results of the 180o Coupler with Lumped Element