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Introduction to Basic Theory for Wireless Wearable Communication System Designers
Published in Albert Sabban, Novel Wearable Antennas for Communication and Medical Systems, 2017
Gain is a usually expressed in decibels (dB). G [dB] = 10 log10G. Gain is realized by focusing power. An isotropic radiator is an antenna which radiates in all directions equally. Effective isotropic radiated power (EIRP) is the amount of power the transmitter would have to produce if it was radiating to all directions equally. The EIRP may vary as a function of direction because of changes in the antenna gain versus angle. We now want to find the power density at the receiver. We know that power is conserved in a lossless medium. The power radiated from a transmitter must pass through a spherical shell on the surface of which is the receiver.
Wearable Communication and IOT Systems Basics
Published in Albert Sabban, Wearable Systems and Antennas Technologies for 5G, IOT and Medical Systems, 2020
Gain is a usually expressed in decibels (dB). G (dB) = 10 log10 G. Gain is realized by focusing power. An isotropic radiator is an antenna which radiates in all directions equally. Effective isotropic radiated power (EIRP) is the amount of power the transmitter would have to produce if it was radiating to all directions equally. The EIRP may vary as a function of direction because of changes in the antenna gain versus angle. We now want to find the power density at the receiver. We know that power is conserved in a lossless medium. The power radiated from a transmitter must pass through a spherical shell on the surface of which is the receiver.
Integral solutions of Maxwell’s equations
Published in Edward J. Rothwell, Michael J. Cloud, Electromagnetics, 2018
Edward J. Rothwell, Michael J. Cloud
An isotropic radiator is a fictitious antenna that radiates equally in all directions. Its radiation intensity is constant with angle: U(θ,ϕ)=PR4π. $$ U(\theta ,\phi ) = \frac{P_R}{4\pi }. $$
Estimation of Gain of Antennas Integrated in Commercial Smartphones
Published in IETE Journal of Education, 2020
G. S. Karthikeya, Shiban K. Koul
Table 1 demonstrates the estimated gains of various cases of signal transmission. Gain is initially calculated in linear scale by plugging the experimental data in Equation 1.2, “dBi” is the industry standard unit for denoting gain. “dBi” indicates the relative gain of the antenna in dB with respect to an isotropic source. The isotropic radiator is assumed to have a gain of 0 dB in all the directions.