Propagation Engineering in Wireless Communications by Abdollah Ghasemi

By Abdollah Ghasemi

This publication covers the elemental ideas for knowing radio wave propagation for universal frequency bands utilized in radio-communications. This comprises achievements and advancements in propagation types for instant communique. This publication is meant to bridge the distance among the theoretical calculations and ways to the utilized techniques wanted for radio hyperlinks layout in a formal demeanour. The authors emphasize propagation engineering through giving basic info and clarify using uncomplicated rules including technical achievements. This re-creation comprises more information on radio wave propagation in guided media and technical concerns for fiber optics cable networks with numerous examples and difficulties. This booklet additionally features a resolution guide - with ninety solved examples allotted through the chapters - and 158 difficulties together with functional values and assumptions.

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Example text

1 Loss Terms in Radio Links Radiowaves propagating between transmitting and receiving antennas, in addition to free-space loss, are subject to excess attenuations including, but not limited to, the following items: • • • • RF feeder loss Antenna gain/loss Propagation mechanism losses Depolarization loss For actual calculations and radio design, all factors shall be taken into account. To describe and standardize the terminology and notations employed to characterize transmission loss and its component, ITU-R under Recommendation No.

8. Radiowaves are radiated by a 10 W transmitter connected to a 5 dBi antenna: 1. Find EIRP if feeder loss is 2 dB 2. Find jEd j and W at a location of 8 km from TX Solution. 1. EIRPŒdBw  D Pt ŒdBw  C Gt ŒdBi  ) Lt ŒdB D 13 dBw EIRP D Antilog13 D 20 W 2. 1 Loss Terms in Radio Links Radiowaves propagating between transmitting and receiving antennas, in addition to free-space loss, are subject to excess attenuations including, but not limited to, the following items: • • • • RF feeder loss Antenna gain/loss Propagation mechanism losses Depolarization loss For actual calculations and radio design, all factors shall be taken into account.

33) In the above formula, Pt is the transmitter power in Watts, d is the distance from antenna in m, E0 is electric field magnitude in V/m, and Á0 is free-space intrinsic impedance equal to 120 . 40) The above formula is generic form of FSL in metric system of units. 7. 5 GHz, 60 % of freespace loss is compensated by using high-gain TX and RX antennas. 1. How much is the received signal level (RSL) at the output of RX antenna with one watt TX output power and considering 15 dB additional losses?

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