Antennas. From theory to practice - download pdf or read online
By Yi Huang
ISBN-10: 0470510285
ISBN-13: 9780470510285
Practical, concise and whole reference for the fundamentals of contemporary antenna design
Antennas: from conception to Practice discusses the fundamentals of contemporary antenna layout and conception. constructed in particular for engineers and architects who paintings with radio communications, radar and RF engineering, this ebook deals sensible and hands-on remedy of antenna thought and strategies, and offers its readers the abilities to examine, layout and degree quite a few antennas.
Key features:
- Provides thorough insurance at the fundamentals of transmission traces, radio waves and propagation, and antenna research and design
- Discusses commercial 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 assorted antennas are provided
- Written in a pragmatic and concise demeanour via authors who're specialists in antenna layout, with adventure from either academia and industry
This ebook can be a useful source for engineers and architects operating in RF engineering, radar and radio communications, looking a complete and functional creation to the fundamentals of antenna layout. The ebook is usually used as a textbook for complex scholars coming into a career during this box
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Additional resources for Antennas. From theory to practice
Example text
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. However, it still exhibits a period feature if we neglect the amplitude changes. All other features remain the same as in the lossless case. 80 Resistance. 3: Quarter-wavelength transform. A 75 resistor is to be matched with a transmission line of characteristic impedance 50 . If a quarter-wavelength transformer is employed, what should its characteristic impedance be?
14(b), may be used. 46) where m = 1/(Rin G L ) and should be greater than 1. It should be pointed out that lumped L networks have no degree of freedom to optimize the bandwidth, whilst the bandwidth is actually a very important consideration of many applications. To resolve this problem, one should consider adding further reactive elements to create T or π networks to optimize the overall bandwidth. 14(a). 47) Step 2: since Z L and jX1 are in series, the composite load impedance can be obtained as Z L N = Z L + jX1 .
582π, since the impedance period is π , not 2π ). 8318. Step 2: Move from point B1 to the center O. This can be achieved easily using a stub connected in parallel with the line, thus it is advantageous to work in admittances. 8318. This can be achieved by the following two designs: A. 0325λ; B. 2825λ. The stub length can also be obtained from the Smith Chart. Now let us examine the bandwidth of these two designs. 475 cm for Design B. We can use the input impedance formula: Z in (l) = Z 0 Z L + j Z 0 tan(βl) Z 0 + j Z L tan(βl) and the following two equations: = VSWR = Z L − Z0 Z L + Z0 1+| | 1−| | to obtain the VSWR as a function of the frequency.
Antennas. From theory to practice by Yi Huang
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