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Glycerol and d,l-homocysteine thiolactone – two bio-based building blocks – were used to prepare a bis-cyclic AA′ monomer (or coupler) with an ethylene carbonate and a thiolactone ring linked by an O-methyl urethane spacer.
The single-balanced mixer comprising two 20 μm × 2 MHEMT Schottky diodes and the tandem coupler with an additional λ/4-length line exhibits the conversion loss less than 7.8 dB and the LO-to-RF isolation higher than 30 dB in a RF frequency range of 91 96 GHz.
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The RF input coupler with a cooling port (L = λ/4), based on a 6 1/8 in.
The design of an integrated optical add-drop multiplexer (OADM), using an adiabatic transition and a symmetric coupler with a superimposed slanted grating, is presented.
At last, a prototype of the magnetic coupler with a size of 550 mm × 500 mm has been built and tested.
The transmission attained through the coupler with a compact size of 400 nm is found to be as high as 80% (1 dB).
The proposed method was then applied to (1) a slider-crank mechanism with a flexible connecting rod and crank of constant rotational speed, and (2) a four-bar linkage with a flexible coupler with a constant speed crank.
Detection of gasoline level can be done in a safe and simple way using two output port multimode fiber coupler with a structure of 2 × 2 as a sensor.
We theoretically analyzed the gain characteristics of an integrated semiconductor quantum dot (QD) fiber amplifier (SQDFA) by using a 2 × 2 tapered fiber coupler with a PbS QD-coated layer.
Then, the error signal is amplified by the error amplifier, supposed linear (typically a class A amplifier working with low signal levels in linear region) and with a gain G e and injected into the coupled port of the output coupler (with a coupling factor C 2 ).
It is possible to produce a coupler with a coupling factor different from 3 dB by making each λ/4 section of the ring alternately low and high impedance but for a 3 dB coupler the entire ring is made \scriptstyle \sqrt 2 of the port impedances – for a 50 Ω design the ring would be approximately 70 Ω.
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CEO of Professional Science Editing for Scientists @ prosciediting.com