Which is the best definition of a coupler?
Anything that serves to couple things together; but especially a device that couples railway carriages. (music) A device that connects two keyboards of an organ together so that they play together. A device used to convert electronic information into audible sound signals for transmission over telephone lines.
Is the differential impedance of a loosely coupled pair the same?
As can be seen, the odd-mode impedance of the loosely coupled pair equals the characteristic impedance of the SE trace, and thus differential impedance would be the same. Figure 3. Comparison of a loosely coupled pair (left), with 4 mil traces, separated by 20 mil space, vs. a SE transmission line (right) with the same dielectric thickness.
How does the differential impedance of a stripline affect coupling?
When the traces are brought closer together, the differential impedance is reduced, unless the line widths are adjusted to compensate. (More about this later.) Figure 1 shows the effect on intra-pair coupling of a pair of edge-coupled stripline traces driven differentially.
What’s the difference between loosely coupled and SE transmission lines?
Comparison of a loosely coupled pair (left), with 4 mil traces, separated by 20 mil space, vs. a SE transmission line (right) with the same dielectric thickness. Odd-mode impedance of the loosely coupled pair equals the characteristic impedance of the SE trace.
When is a directional coupler a coupled coupler?
Any directional coupler is bi-directional, that is, it performs equally well when the signal is incident on port 2 versus port 1, but the coupled and isolated ports flip. All direction couplers are bi-directional, unless you terminate one of the ports. Consider the coupled-line coupler below.
Which is the isolated port on a directional coupler?
Generic directional coupler schematic symbol. Looking at the generic directional coupler symbol below, if port 1 is the incident port, port 2 is the through port (because it is connected with a straight line). Port 3 is the coupled port, and port 4 is the isolated port.
What’s the difference between a forward and backward coupler?
Forward couplers are in-phase couplers. Backward couplers couple in quadrature (the coupled port phase is 90 degrees more negative than the direct port). We attempt to explain why the phases are in quadrature on our coupled-line coupler page.
What is the ratio of isolation to coupling factor?
Directivity is the ratio of isolation to coupling factor. In decibels, isolation is equal to coupling factor plus directivity. This topic has its own page. Bethe-hole is a waveguide directional coupler, using a single hole, and it works over a narrow band.