Microwaves101 | Directional Couplers
Forward-Wave Versus Backward-Wave CouplersGeneric Directional Coupler Schematic SymbolDirectional Coupler DefinitionsBethe-Hole CouplerMulti-Hole CouplerBi-Directional PropertyDual-Directional CouplerHybrid CouplersReflectometerNew for January 2013: we will further describe the simple difference between forward and backward wave coupling. In the forward-wave coupler, energy that propagates down transmission line starts a parallel wave down transmission line 2 as shown below. The most common forward coupler is the multi-hole coupler realized in waveguide. In this case the holes are spaced a quarter wave apart so that the reverse wave cancels out. Flat coSee more on microwaves101Published:
Power dividers and directional couplers - Wikipedia
OverviewNotation and symbolsParametersTransmission line typesWaveguide typesDiscrete element typesPower dividers and directional couplers are passive devices used mostly in the field of radio technology. They couple a defined amount of the electromagnetic power in a transmission line to a port enabling the signal to be used in another circuit. An essential feature of directional couplers is that they only couple power flowing in one direction. Power entering the output port is coupled to the isolated port but not to the coupled port. A directional coupler designed to split power equally betwSee more on enpedia · Text under CC-BY-SA license
RF Combiners, Splitters, Couplers and Hybrids
Typical commercially available hybrid coupler RF coupler, splitter, combiner, hybrids - what they are. The terms RF combiners, splitters, couplers and hybrids refer to slightly different items. Each item is used in RF design and all are important to the RF designer. RF combiner: An RF combiner is used to combine RF from a number of different
Multi-Lock Coupler - Dromone | Construction, Technology
The DROMONE Multi-Lock Automatic Coupler is a proven and innovative hydraulic quick coupler designed to provide our customers with unmatched performance and versatility, ease of service, and reliability with a proven product life cycle two times the industry standard.
Optocoupler Circuits | Nuts & Volts Magazine
Because of the high current gain of the Darlington, this coupler has a typical minimum CTR value of about 300%, but has a useful bandwidth of only 30kHz. The dual and quad optocouplers of Figure 7 use single-transistor output stages in which the base terminal is not externally available.
Directional Couplers - an overview | ScienceDirect Topics
Directional coupler schematic. (a) Coupler plus power components. (b) Alternate RF configuration. By varying the turns ratio of both transformers, various values of coupling are possible. Ellis 14 has published a tabulation of coupling values as a function of turns ratios, along with a good description of coupler operation.
Application Note: Directional Couplers
PDF fileA schematic representation of the coupler is as follows; the arrows show signal flow: Key characteristics of a directional coupler include coupling coefficient, coupling flatness, main-line loss and directivity, defined on the next page. Mini-Circuits' full line of directional couplers, spanning 5 kHz to 2 GHz, provide excellent performance.
Homebrew HF SWR/Power Meter - 285 TechConnect Radio Club
PDF fileDirectional Coupler RF IN RF X OUT Forward Coupler X Green = desired coupling Red = undesired coupling •Coupling factor represents the primary property of a directional coupler •To reduce 100 w to 100 mw => Coupling factor = -30 dB •Directivity is the measure of how well a coupler isolates two opposite-travelling (forward and reverse) signals
PDF fileSince the coupler is a lossless passive element, the sum of the signals power at ports 1 and 2 equals to the input signal power. The reverse travelling wave goes into port 2 and out of port 1. A small fraction of it goes out through port 3. In a perfect coupler, no signal appears in port 4.