By Jay L. Hirshfield, Michael I. Petelin
This quantity assembles the texts of displays given on the NATO-sponsored complex learn Workshop on Quasi-Optical Transmission of High-Power Microwaves, held in Nizhny Novgorod, Russia in February 2004. The shows bridge a variety of technical components, yet proportion universal instruments of study and layout. functions of quasi-optics expand to using high-power microwaves—including millimeter-waves— for radar and communications (especially deep area millimeter-wave structures, house particles detection radar, and radar for the detection of small pursuits relocating over heavy clutter); particle accelerators (especially for a destiny high-acceleration-gradient electron-positron collider); plasma learn (especially for managed nuclear fusion and waste decontamination); and fabric processing (in specific, ceramic sintering with millimeter-waves, and the coating of steel surfaces with protecting dielectric films.). Scientists and engineers operating in any of those components may still profit considerably from publicity to this huge diversity of well timed expositions authored via the various world’s best specialists in those fields. The editors, themselves being unique, relevant proponents of a few of the suggestions mentioned right here, have built-in vital contributions from many fields right into a cohesive entity.
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Extra info for Quasi-Optical Control of Intense Microwave Transmission
5 and T = 450 and preferable in practice. (a) (b) ș Figure 8. Calculated power transmission coefficient T for equidistant (a) and non-equidistant (b) grids. 532m and different angles of the inner grid T varying within the range 30 – 55 degrees. It is clearly observed that a gradual transition from undercoupled (T < 450 ) toward critically coupled (T = 450 ) and then to overcoupled (T > 450 ) regimes of the resonator considered with increasing T . 6. THE ANGLE OF CRITICAL COUPLING According to (9) two basic factors determine reflectance of the resonator loaded by grid’s coupler as a function of frequency-angular position of inner grid T and unloaded Q = 2E /D of quasi-optical resonator itself for a fixed resonator length.
The HP-8757D network analyzer was used to measure reflectance (transmittance) of the 3-grid coupler and the quasi-optical resonator. Figure 10 shows measured power transmittance of the 3-grid coupler in a free space. 375mm (Ȝ = 3mm). The measurements were done at frequencies 95, 100 and 105 GHz. 5 and ș = 45 deg that is closed to the theoretical prediction. 11. 9 demonstrating under-coupled, critical and over-coupled conditions. Critical coupling corresponds to T near 45o (marked by circles). According to the Table 2 and the Q-factor corresponding with this angle, it is about 20000.
4, . It consists of a shorted-line section of the length l corresponding to the physical length of the FEM resonator Figure 4. The equivalent schematic of inductively coupled shorted-line resonator . The equivalent inductor L corresponding to the polarizing grids coupler shunts its input. The model allows extracting Q factors in a relatively easy way. The formulation can be done using the inductively coupled shortedline resonator model . As a result, the following expression can be derived for the magnitude of input reflection coefficient S11(Į,L,Ȧ) Z jZL 1) 01 tanh[(D jE )l ] Z0 Z0 Z jZL ( 1) 01 tanh[(D jE )l ] Z0 Z0 ( S11 (D , L, Z ) jZL Z0 jZL Z0 (4) 30 Kapilevich where: L is the inductance; Z0 and Z01 are the system impedance of both the network analyser waveguide and of the resonator waveguide mode, D is the attenuation constant.
Quasi-Optical Control of Intense Microwave Transmission by Jay L. Hirshfield, Michael I. Petelin