By Yi Huang
Practical, concise and entire reference for the fundamentals of contemporary antenna design
Antennas: from concept to Practice discusses the fundamentals of recent antenna layout and concept. constructed in particular for engineers and architects who paintings with radio communications, radar and RF engineering, this publication bargains useful and hands-on therapy of antenna conception and strategies, and offers its readers the abilities to examine, layout and degree numerous antennas.
- Provides thorough assurance at the fundamentals of transmission strains, radio waves and propagation, and antenna research and design
- Discusses business average layout software program instruments, and antenna dimension gear, amenities and techniques
- Covers electrically small antennas, cellular antennas, UWB antennas and new fabrics for antennas
- Also discusses reconfigurable antennas, RFID antennas, Wide-band and multi-band antennas, radar antennas, and MIMO antennas
- Design examples of varied antennas are provided
- Written in a pragmatic and concise demeanour through authors who're specialists in antenna layout, with event from either academia and industry
This e-book can be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a entire and functional creation to the fundamentals of antenna layout. The publication is usually used as a textbook for complex scholars getting into a career during this box
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Extra resources for Antennas. From theory to practice
Inductive. 2: Input impedance of a low-loss transmission line. A 75 resistor is now connected to a good transmission line with characteristic impedance of 50 . 2 Np/m at 1 GHz. Plot the input impedance as a function of the line length (up to 2λ). 5. Solution: For a low-loss transmission line, the characteristic impedance is still a constant (= 50 in this case). The line length changes from 0 to 2λ. 49 m. 2 + j2π/λ. 7. It can be seen that the only change is that the input impedance is no longer a periodic function of the line length.
19). This extra term is the time derivative of the electric field and is known as Maxwell’s displacement current. Maxwell’s modified version of Ampere’s Circuital Law enables the set of equations to be combined together to derive the electromagnetic wave equation, which will be further discussed in Chapter 3. Now let us have a closer look at these mathematical equations to see what they really mean in terms of the physical explanations. 30) This equation simply means that the induced electromotive force is proportional to the rate of change of the magnetic flux through a coil.
It is worth noting that the reverse-traveling current has a minus sign with the amplitude, this means a phase change of 180 degrees and reflects the direction change in the returned current. The velocity of the wave is another parameter of interest and it can be determined from the phase term: ωt − βz. e. 14), the velocity is a function of frequency, which is a well-known dispersion problem (change with frequency). 17) where λ is the wavelength. The phase constant is also called the wave number.