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Losses of energy in printing radiators ARE are connected with losses in dielectric of a substrate and covering, and also in metal elements of a design — a plate and the screen. Loss in a covering there are significantly less than losses in a substrate, and as a first approximation they can be not considered as intensity of electric field in space between a plate and the screen is significantly more, than in covering dielectric.

Entrance resistance (in a working strip of frequencies behaves as resistance of a parallel contour, however at a frequency corresponding to a maximum of an active component of entrance resistance, the jet component does not address in zero and it is equal to the inductive resistance of the ZShT probe.

represent active and jet components of conductivity. Here - wave number of free space; t - substrate thickness; 0 - wavelength in freedoms of number space; 0, 0 - electric and magnetic constants.

At rough estimates of DN of a rectangular printing radiator across the field with the main polarization it is possible to consider as DN of two inphase face cracks with uniform distribution of a field. In the same way DN across the field with cross-polarization decides as DN of two antiphase lateral cracks on odd distribution of a field.

If thickness of the screen is significantly less than a wavelength and the probe is continuation of the central conductor of a coaxial wave guide, the coefficient of transformation of the ideal transformer can be put equal to unit, and reactivity of an element connected in parallel - to zero.

It agrees (2 at reduction of thickness of a substrate of loss increase in the screen and a plate and can significantly exceed losses in substrate dielectric. When using VCh of dielectrics with tg <10-3 and thickness of a substrate of t> 0,01 losses in printing radiators are negligible.

Determination of the resonant sizes. Choose reference values of thickness and dielectric permeability of a substrate. At any position of the probe on one of symmetry axes on (count dependence of ZBX=ZBX (b) or ZBX=ZBX (. To the resonant size of a plate there corresponds the maximum of an active component of ZBX.