Transmission Loss in Radio Propagation
Open Access
- 1 January 1953
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IRE
- Vol. 41 (1), 146-152
- https://doi.org/10.1109/jrproc.1953.274172
Abstract
The utility of the concept of transmissionloss in radio-propagation analysis is explored. The transmission loss of a radio system is defined to be the ratio of the power radiated from the transmitting antenna to the resulting signal power available from a loss-free receiving antenna. After discussing some methods of measuring transmission loss, its calculation for representative systems is discussed. It is shown that a measure of transmission loss often adopted, namely the attenuation relative to the free-space value, sometimes leads to errors and confusion in the presentation of the results of measurements and in applications to radio systems; the use of the over-all transmission loss of a system avoids these pitfalls. A discussion is given of the expected variation with time (fading) of the transmission loss expected for radio systems involving ionospheric or tropospheric propagation. This discussion involves the theory of the Rayleigh distribution and its limitations in such applications. A definition is then derived for the effective noise figure of a radio system which includes the external noise picked up on the receiving antenna. This definition is used to explain the method of determining the maximum range of a radio system. Finally a discussion is given of the maximum range of a radio system as limited by interference from other radio signals plus noise rather than from noise alone.Keywords
This publication has 11 references indexed in Scilit:
- Radio wave scattering in tropospheric propagationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Scattering of Electromagnetic Energy in a Randomly Inhomogeneous AtmosphereJournal of Applied Physics, 1952
- Cosmic Radio Noise Intensities in the VHF BandProceedings of the IRE, 1952
- Transmission loss of space waves propagated over irregular terrainTransactions of the IRE Professional Group on Antennas and Propagation, 1952
- A statistical approach to the problem of multiple radio interference to FM and television serviceTransactions of the IRE Professional Group on Antennas and Propagation, 1952
- On the Response of a Directive Antenna to Incoherent RadiationProceedings of the IRE, 1951
- A Theory of Radio Scattering in the TroposphereProceedings of the IRE, 1950
- The Maximum Range of a Radar SetProceedings of the IRE, 1947
- Noise Figures of Radio ReceiversProceedings of the IRE, 1944
- XII. On the resultant of a large number of vibrations of the same pitch and of arbitrary phaseJournal of Computers in Education, 1880