Port Resonance

Two-port devices include SAW, FPW, and APM delay lines and the two-port-resonator variations of these devices. For all the delay lines, the transmitted signal S]2 (between ports) is most important Just as in one-port measurements, a network analyzer is the instrument of choice to measure frequency response the setup is depicted in Figure 6.9(a) (page 362). Frequency response can also be measured using the synthesized oscillatorA VM combination shown in Figure 6.9(b). As for the one-port measurements, this setup is most convenient when computer controlled. 

The amount of MW power reaching the sample in the resonator is controlled by a variable attenuator. Like the isolator, the circulator is a non-reciprocal device that serves to direct the MW power to the resonator (port 1 port 2) and simultaneously allows the signal reflected at resonance to go from the resonator directly to the receiver (port 2 port 3). 

Fig. 2.1 Basic microring resonator structures and their output characteristics, (a) One ring resona tor and one bus waveguide and (b) the corresponding resonance spectrum at the through port, (c) One ring resonator and two bus waveguides and (d) the corresponding resonance spectrum at the through port and drop port. Reprinted from Ref. 15 with permission. 2008 Institute of Electrical and Electronics Engineers...

Fig. 8.1 (a) A microring resonator, closely coupled to two bus waveguides, has two output ports through port and drop port, (b) Typical output spectra have periodic dips in the through port (dash) and peaks in the drop port (solid), respectively, resulting from resonance of the microring resonator... 

Fig. 9.15 A ring resonator sensor interrogation circuits with (a) one bus waveguide, and (b) two bus waveguides. The plots give a qualitative indication of the typical intensity spectrum that would be observed at the respective output ports...

The checkers used a 40-cm. spinning-band column. The product, n2bD 1.4237, was shown to be 98.9% pure by gas-liquid chromatography on a 6-ft. 20% fluorosilicone column. The retention time was 3.75 minutes with a flow rate of helium of 100 ml. per minute, and a column temperature of 125° with the injection port at 170°. The 19 F n.m.r. spectrum (56.4 MHz) consists of four lines of equal intensity centered at +3396 Hz from trichlorofluoromethane (internal) and two sets of two overlapping quartets centered at +4369 Hz and +4461 Hz, respectively. The integrated intensities of the three sets of fluorine resonances are 3 1 1. 

Idee JM, Port M, Raynal I, Schaefer M, Le Greneur S, Corot C (2006) Clinical and biological consequences of transmetallation induced by contrast agents for magnetic resonance imaging a review. Fundam. Clin. Pharmacol. 20 563-576. 

Fig. 13 shows an example where data for an irregular struetured multilayer thin-film-filter (TFF) are imported into a waveguide design. A FDTD-simulation earned out in order to check the influence of the internal resonator-like strueture of the TFF onto the waveguide deviee shows a signifieant transversal shift for oblique incidence. This hinders symmetrical multi-port designs, but may be used for specific WDM functionality. ... 

Connolly A, Dalgleish WH, Harkins P, Keat R, Porte AL, Raitt I, Shaw RA (1978) J Magn Reson 30 439... 

Identification of unknown compounds by retention times or peak enhancement is not conclusive or absolute proof of identity. It is possible for two different substances to have identical retention times under the same experimental conditions. For positive identification, the sample must be collected at the exit port and characterized by mass spectrometry, infrared, nuclear magnetic resonance, or chemical analysis. 

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