Crossed-field Microwave Device. Principal Types of by G. Mourier

By G. Mourier

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J>6 19 Section as* 92 FIG. 4 . Dispersion curves measured on two ladder lines which are homothetical only in a plane perpendicular to the bars. One sees that the delay factors are nearly exactly in the same ratio as is claimed by the bar line theory. All dimensions in millimeters. J. 54 Β. ARNAUD FILTER ANALOGY AND DISPERSION IMPROVEMENTS If we m a k e t h e assumptions leading t o relation ( 2 4 ) in t h e previous section, t h e ladder line structure can be represented b y a π filter structure (L, C) a n d one can apply t h e general result of relation ( 9 ) of Section 2 .

On t h e other hand, high thermal conductivity insulators such as beryllium oxide could b e used t o support a s t r u c t u r e ; this could b e advantageous a t high delay factors. I t is t h e purpose of t h e theoretical developments which will follow t o show h o w t o calculate these characteristics. I n m a n y cases, such as t h e usual ladder line, t h e delay factor cannot be simply predicted with a n accuracy better t h a n 10 or 20%. A model m u s t b e built ( a t a n y scale, however) and it is necessary t o know how t o relate r, (R, vph/vg—the values measured on t h e model—and h o w t o interpret these results in order t o modify t h e structure in t h e right way.

2 , dotted lines J. 52 ARNAUD 3. Case of a Small Geometrical Shift of One Comb with Respect Other in the Direction of Propagation to the I n this case t h e interdigital line is n o longer symmetrical a n d we m u s t return t o t h e more general expression of t h e dispersion relation (3). One can see t h a t t h e shift involves a little stop b a n d centered a r o u n d φ = π ; for a line of finite length one observes a n increase of t h e V S W R a t t h e input of t h e line a t λ = 4d (in cold tests) a n d a j u m p of t h e starting current (in O-type backward wave oscillators, in particular) (1, 2).

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