Directional coupler
A directional coupler and directional technology, applied in the direction of waveguide devices, circuits, connecting devices, etc., can solve the problems of inconvenient and large space, and achieve the effects of saving space, increasing reliability, and saving costs
Inactive Publication Date: 2013-03-13
INTEL CORP
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Problems solved by technology
A drawback of all directional couplers using λ / 4 long wires is that they only work satisfactorily over a relatively narrow frequency range
Furthermore, in many applications they require inconveniently large
Method used
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Embodiment Construction
[0025] Figure 1-4 The description has been made in connection with the prior art.
[0026] Figure 5a -c shows an example of a directional coupler according to the present invention. Viewing the coupler from above Figure 5a , in the view from the input port side Figure 5b , in the perspective of Figure 5c in, according to Figure 5a and 5b The directional coupler only has a ground plane. The directional coupler 500 includes a relatively bulky ground plane 510 and a dielectric substrate 501 atop it. In this example, the transmit conductor 520 and the sense conductor 530 of the directional coupler are conductive strips located on the upper surface of the substrate. There is also a ground strap 515 on the upper surface of the substrate. In this example, the lower surface of the substrate is heavily coated with conductors that are in contact with the ground plane, so it is part of the signal ground GND. It is advisable to form such a coating at least to the fastening...
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A directional coupler (500), which comprises a dielectric substrate (501) on top of a metal plate (510), is functioning as a ground plane. The transmission path is a suspended stripling so that there is a recess on the ground plane below the transmission conductor (520) being on the surface of the substrate. The sensing conductor (530) is a very small-sized conductive strip on the surface of the substrate. It has been connected from its head end to the measurement port (P3) and from its tail end via a termination resistor (550) to a small ground strip (515). The ground strip is next to the sensing conductor on the side of the output port (P2) of the directional coupler. With such an asymmetric structure, some directivity is obtained despite the small size of the sensing conductor. Also below the sensing conductor (530) there is a recess (506) on the ground plane, which joins the recess below the transmission conductor (520). By dimensioning the recess below the sensing conductor suitably, the velocities of the even and odd waveform occurring in the line constituted by it and the ground plane are obtained the same and thus directivity can be improved. The directional coupler is very space saving on the circuit board. As the substrate, an ordinary circuit board material can be used, whereby the board can have in addition to the directional coupler also other parts of radio-frequency circuits. The directional coupler does not require tuning in production.
Description
technical field [0001] This invention relates to directional couplers for use in radio frequency circuits. Background technique [0002] A directional coupler is a device related to the transmission path of radio frequency electromagnetic fields. It gives the measured signal level proportional to the field strength propagating in a particular direction along the transmission path. In theory, fields propagating in the opposite direction to the transmission path do not affect the level of the measured signal. A directional coupler has at least three ports: input, output, and measurement port. Almost all of the signal energy entering the input port is directed through the coupler to the output port, and a small portion of this energy is transferred to the measurement port. The part of the directional coupler between the input and output ports is at the same time part of the transmission path of the radio which continues to eg the antenna of the transmitter. A measurement si...
Claims
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IPC IPC(8): H01P5/18
CPCH01P5/187H01P5/185
Inventor E·尼拉南
Owner INTEL CORP