In the microwave technique, there's
frequently a want of one path in the microwave power getting divided into
several paths, which is the issue of energy allocation. The elements of
realizing this function are called power splitting elements, namely, couplers,
mostly which includes the directional coupler, the energy divider and the
different microwave branching devices.
Directional coupler is a kind of element of
4 ports with directional transmission qualities, that is composed of two pairs
of transmission systems which are linked together by the coupling device.
Tapered Thread
Coupler would be the most straightforward waveguide directional coupler,
and each the main and auxiliary waveguides realize coupling by the two tiny
holes on the public narrow wall. Double waveguide directional coupler is to
rely on the mutual interference in the wave to recognize the directional output
of main waveguide, as well as the exact same phrase may be overlaid in the
coupling port, the reversed phase could be offset in the isolation port. In
order to increase the coupling degree of directional coupler, and broaden the
working frequency band, multi-hole directional coupler can be employed.
Double branch directional coupler is
composed of principal line, sub line and two branch lines, amongst which the
length along with the spacing of branch line are 1/4 of the center wavelength.
The parallel coupled micro strip
directional coupler is really a form of reverse directional coupler, whose
coupling output is in the same side using the principal input.
he isolator can also be named reverse device,
when the electromagnetic wave passes via it in forward direction, there is
certainly almost no attenuation, and when the electromagnetic wave passes by
way of it in reverse path, there is certainly really massive attenuation. The
frequent isolator has two kinds: resonant mode and field shifting type.
Photoelectric coupler can be a type of
electric-light-electric converter using the light because the medium to
transmit electrical signal. It truly is composed of two parts: light supply and
light receptor. The light source along with the light receptor are assembled
within the identical closed shell, as well as the transparent insulator is
employed to isolate each other. The pin of light supply is input terminal, as
well as the pin in the light receptor will be the output terminal, the frequent
light supply for the light-emitting diode, and the light receptor is
photosensitive diode, photosensitive transistor, and so on. there are lots of
kinds for photoelectric coupler, which frequently contains photoelectric diode,
photoelectric triode, photosensitive resistance type, optically controlled
thyristor type, photoelectric Darlington kind, integrated circuit kind and so
forth.
In line with the material and processing
technologies, there are many couplers, including Rebar Couplers, Threaded coupler, Reinforcing
Bar Coupler, Steel bar coupler, Tapered Thread
Coupler, Cold Extrusion Coupler.
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