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Field and Wave Electromagnetics 2nd Edition by David Cheng
Edition 2ISBN: 978-0201128192Field and Wave Electromagnetics 2nd Edition by David Cheng
Edition 2ISBN: 978-0201128192 Exercise 2
Describe two phenomena or situations, other than those depicted in Figs. 1-1 and 1-2, that cannot be adequately explained by circuit theory.
Explanation
Verified
Verified
(i )
Circuit theory has certain inadequacy over the networks and it deals only with the lumped parameters.
Some of the examples to narrate the inadequacy of the circuit theory is explained below.
Wireless Internet Service Provider (WISP):
• WISP is used to provide the data transmission (internet service provider) with network based wireless networking.
• The WISP antenna is used to transfer the data through air medium with the frequency range of 900 MHz to 5.8 GHz.
• The signal transmission is done at different levels like, WiMax and Virtual Private Networking.
• From the circuit theory point of view, the source is fed in to the open air and there is no lumped parameters connected with antenna. So, there is no closed path formed to analyze the circuit. Although, there is a transition of voltage and current from one circuit to other circuit, it cannot be analyzed using circuit theory, as there is no closed path.
Figure 1
The Wireless Internet Service Provider antenna is shown in Figure 1
(ii)
Fiber optic cable:
• Fiber optic cables are used to transfer the light signals. The core and cladding layer is used to select the reflection of light in the cable.
• The electromagnetic carrier wave is converted in to light signal and fed in to optical fiber.
• The minimum loss occurs in optical fiber, because the light signal is not absorbed by the core and not reflected over the outer cover of cable.
• From the circuit theory point of view, the source is transferred as a light signal into the cable and there is no lumped parameters involved while transferring the signal. Although, there is a transition of voltage and current from one circuit to other circuit, it cannot be analyzed using circuit theory, as there is no physical part involved in the system.
Figure 3
Thus, the phenomenon that cannot be adequately explained by the circuit theory is explained.
Circuit theory has certain inadequacy over the networks and it deals only with the lumped parameters.
Some of the examples to narrate the inadequacy of the circuit theory is explained below.
Wireless Internet Service Provider (WISP):
• WISP is used to provide the data transmission (internet service provider) with network based wireless networking.
• The WISP antenna is used to transfer the data through air medium with the frequency range of 900 MHz to 5.8 GHz.
• The signal transmission is done at different levels like, WiMax and Virtual Private Networking.
• From the circuit theory point of view, the source is fed in to the open air and there is no lumped parameters connected with antenna. So, there is no closed path formed to analyze the circuit. Although, there is a transition of voltage and current from one circuit to other circuit, it cannot be analyzed using circuit theory, as there is no closed path.
Figure 1The Wireless Internet Service Provider antenna is shown in Figure 1
(ii)
Fiber optic cable:
• Fiber optic cables are used to transfer the light signals. The core and cladding layer is used to select the reflection of light in the cable.
• The electromagnetic carrier wave is converted in to light signal and fed in to optical fiber.
• The minimum loss occurs in optical fiber, because the light signal is not absorbed by the core and not reflected over the outer cover of cable.
• From the circuit theory point of view, the source is transferred as a light signal into the cable and there is no lumped parameters involved while transferring the signal. Although, there is a transition of voltage and current from one circuit to other circuit, it cannot be analyzed using circuit theory, as there is no physical part involved in the system.
Figure 3Thus, the phenomenon that cannot be adequately explained by the circuit theory is explained.
Field and Wave Electromagnetics 2nd Edition by David Cheng
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