By Boris Levin
The booklet bargains with theoretical and experimental study of antennas. The presentation is predicated at the electromagnetic thought. It starts off with the speculation of skinny antennas. skinny antennas characterize one of many major kinds of radiators, therefore the speculation of skinny antennas is the root of the antennas research.
Special cognizance is paid to the vital equation of Leontovich-Levin for a present alongside a immediately thin-walled steel cylinder, that is corresponding to the equation of Hallen with an actual kernel. including the research of varied sorts of antennas, the e-book offers with the issues of synthesis together with the construction a wide-band radiator by way of opting for of the categories and the magnitudes of targeted rather a lot, that are attached alongside a linear radiator and create in a given frequency band excessive electric functionality.
Problems of antenna engineering are mentioned within the moment half the ebook, together with the result of software of a reimbursement process for the security of people opposed to irradiation and structural positive factors of send antennas.
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Extra info for Antenna Engineering : Theory and Problems
21), we present the currents JI(z) and JII(V) in the form of series in powers of small parameters c1 and c2, respectively. Since functionals W(JI, z) and Ez(JII, a1, z) are linear, they can also be presented in the form of similar series. 16), written for a single radiator: d 2 J I 1 ( z) dz 2 d 2 JIn ( z) dz 2 JI 1 (± L1 ) = 0 , + k 2 JI 1 ( z) = -4p jwe K I ( z), n -1 È ˘ Êc ˆ Ez ( JII , n -1 )˙ , JIn (± L1 ) = 0 , n > 1 . 40) for the radiator excited by concentrated emf KI(z) = eId(z), its current in the first approximation in the presence of the second radiator also has a sinusoidal nature: c1 JI 1 ( z) = j c1 eI sin k ( L1 - z ).
E. if to neglect by the summands of order of a/L and ka and to keep the summands proportional to the logarithm of these quantities, we obtain: L T ( z, j ) = -2 J( z)ln pr1 - È dJ(V ) ˘ - jkJ(V )sign(V - z)˙ dV , dV ˚ Ú exp (- jk V - z ) ln 2p V - z ¥ ÍÎ -L where p is a some constant having the dimensions of inverse length. 10) 30 Antenna Engineering: Theory and Problems where L V ( J , z) = Ú exp (- jk V - z ) ln 2p z - V ÈÎ jkJ(V ) + sign(z - V )dJ(V )/ dV ˘˚dV . -L The tangential component of the electric field of the antenna is Ez ( r , z) = - j ∂2 Az ˆ w Ê 2 .
12 Loss resistance in water for a radiator with shifted feed point. The considered example shows that the theorem about the oscillating power changes significantly the understanding of the processes related with the transfer of power between the objects. 1 INTEGRAL EQUATION FOR LINEAR METAL RADIATOR As shown in Chapter 1, knowledge of the current distribution along a linear radiator allows to determine the electromagnetic field and all electrical characteristics of the radiator. For this reason, calculation of the current distribution is an important problem of the antenna theory.