By Boris Levin
The ebook bargains with theoretical and experimental examine of antennas. The presentation relies at the electromagnetic thought. It starts off with the idea of skinny antennas. skinny antennas characterize one of many major kinds of radiators, hence the idea of skinny antennas is the root of the antennas research.
Special recognition is paid to the necessary equation of Leontovich-Levin for a present alongside a instantly thin-walled steel cylinder, that is resembling the equation of Hallen with an actual kernel. including the research of varied forms 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 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 1/2 the e-book, together with the result of program of a repayment strategy for the security of people opposed to irradiation and structural positive factors of send antennas.
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Additional resources for Antenna Engineering : Theory and Problems
E. this method leads to incorrect results. 27) is equal to zero. 25). 27) in the area of serial resonance. 27)—give more accurate results in one area and have an approximate nature in another area. 31) ZA = ZS + ZP . 27), p/2 is the value of kL at the point of the serial resonance, p is the value of kL at the point of the parallel resonance, and a is the value of kL at an arbitrary point. As can be seen from this expression, when a changes from p/2 to p the value of the first term uniformly decreases from ZS to zero, and the value of the second term increases uniformly from zero to ZP.
The analysis of two-radiator systems is based on the fact that the current of one radiator creates the field, which has the electrical component tangential to the surface of the second radiator. This component induces the field EV (J1)dV on the surface of element dV of the second radiator. In order to execute the boundary condition EV = 0 on this surface, the own field of the second radiator on its surface must be equal to –EV (J1)dV. The generator of the second radiator must increase the power in the element dV by dP = –EV (J1)J2(V)dV and, accordingly, the power in the entire radiator by L2 P=- Ú E ( J )J (V )dV .
5a) is an example of a radiator with distributed load. 51) where Ez(a, z) and Hj(a, z) are the tangential component of the electric field and the 42 Antenna Engineering: Theory and Problems azimuthal component of the magnetic field, respectively, and Z(z) is a surface impedance, which is in the general case dependent on coordinate z. , inside a magneto dielectric sheath) is independent of a field structure in another medium (ambient space). 51) on the antenna surface are valid and the surface impedance substantially changes the distribution of current along the antenna already in the first approximation, the antenna is called an impedance antenna.