Dual Directional Coupler

The internal structure of the Dual Directional Coupler is precisely optimized, with its core consisting of a main transmission line and two independent coupling transmission lines.

These two sets of coupling transmission lines correspond to the extraction needs of forward and reverse signals, respectively, and are coupled to the main transmission line through a specific layout.

This dedicated structural layout allows the forward and reverse signals to interact with their corresponding coupling lines during transmission, providing a physical basis for subsequent signal separation and avoiding mutual interference between the two directions at the structural level.

The coupling process of the Dual Directional Coupler follows the principle of directional coupling.

The electromagnetic field generated by the main signal during transmission on the main transmission line forms a specific coupling path with the coupling transmission lines.

For the forward-propagating signal, the phase relationship between its electromagnetic field and the coupling method of the coupling lines ensures that energy can only form a stable coupled signal on one set of coupling lines.

For the reverse-propagating signal, its electromagnetic field phase is opposite to that of the forward signal, forming a matched coupling relationship with the other set of coupling lines, thus achieving initial separation of forward and reverse signals at the coupling level.

The key parameters of the internal transmission lines in a Dual Directional Coupler are meticulously calibrated.

Matching designs for parameters such as line length, spacing, and impedance ensure strong directional selectivity during coupling.

When signals propagate in different directions, the transmission line parameters cause the coupled signals to superimpose and amplify at specific ports, while canceling each other out at other ports.

This optimized superposition and cancellation effect further enhances the directional output characteristics of the signal, ensuring that the forward signal is output only from its corresponding port, and the reverse signal is extracted from another dedicated port.

The Dual Directional Coupler possesses excellent port isolation performance.

The isolation design between the forward and reverse coupling ports prevents the separated forward and reverse coupled signals from interfering with each other again.

This isolation feature allows the coupled signals in both directions to transmit independently, without confusion in the output path.

This ultimately achieves clear separation of the forward and reverse waves, providing a clean and independent signal source for subsequent signal detection and processing.