.net barcode reader library Copyright 2001 - the McGraw-Hill Companies in Software

Generate ECC200 in Software Copyright 2001 - the McGraw-Hill Companies

Copyright 2001 - the McGraw-Hill Companies
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60 Transmission lines
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S 3-1A Parallel line transmission line (end view) d (End view) d
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3-1B Twin-lead transmission line
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3-1C Parallel line construction details
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Insulator
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Parallel and coaxial lines 61 form of insulator is made of either plastic or ceramic, and is in the form of a U The purpose of this shape is to reduce losses, especially in rainy weather, by increasing the leakage currents path relative to spacing S Parallel lines have been used at VLF, MW, and HF frequencies for decades Even antennas into the low VHF are often found using parallel lines The higher impedance of these lines (relative to coaxial cable) yields lower loss in high-power applications For years, the VHF, UHF, and microwave application of parallel lines was limited to educational laboratories, where they are well suited to performing experiments (to about 2 GHz) with simple, low-cost instruments Today, however, printed circuit and hybrid semiconductor packaging has given parallel lines a new lease on life, if not an overwhelming market presence Figure 3-1E shows a form of parallel line called shielded twin lead This type of line uses the same form of construction as TV-type twin lead, but it also has a braided shielding surrounding it This feature makes it less susceptible to noise and other problems The second form of transmission line, which finds considerable application at microwave frequencies, is coaxial cable (Figs 3-1F through 3-1L) This form of line consists of two cylindrical conductors sharing the same axis (hence coaxial ), and separated by a dielectric (Fig 3-1F) For low frequencies (in flexible cables) the dielectric may be polyethylene or polyethylene foam, but at higher frequencies Teflon and other materials are used Also used, in some applications, are dry air and dry nitrogen
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Dielectric
3-1E Shielded twin-lead transmission line
Parallel conductors
Outer conductor
3-1F Coaxial cable (end view)
Dielectric
Inner conductor
62 Transmission lines Several forms of coaxial line are available Flexible coaxial cable is perhaps the most common form The outer conductor in such cable is made of either braid or foil (Fig 3-1G) Television broadcast receiver antennas provide an example of such cable from common experience Another form of flexible or semiflexible coaxial line is helical line (Fig 3-1H) in which the outer conductor is spiral wound Hardline (Fig 3-1I) is coaxial cable that uses a thin-wall pipe as the outer conductor Some hardline coax used at microwave frequencies has a rigid outer conductor and a solid dielectric Gas-filled line is a special case of hardline that is hollow (Fig 3-1J), the center conductor is supported by a series of thin ceramic or Teflon insulators The dielectric is either anhydrous (ie, dry) nitrogen or some other inert gas Some flexible microwave coaxial cable uses a solid air-articulated dielectric (Fig 3-1K), in which the inner insulator is not continuous around the center conductor, but rather is ridged Reduced dielectric losses increase the usefulness of the
Outer insulator Inner conductor 3-1G Coaxial cable (side view) Inner insulator
Braid Insulating sheath
Dielectric
3-1H Coaxial hardline cable Inner conductor
Shield Rigid outer conductor
Dielectric
3-1I Rigid coaxial line
Inner conductor
Parallel and coaxial lines 63
Insulators Center conductor
3-1J Gas-filled hollow coaxial line
Outer conductor
3-1K Articulated coaxial line Dielectric (vaned)
Insulating sheath
Outer insulator
Inner insulator
Center conductor
Outer shield
Inner shield
3-1L Double-shielded coaxial line
cable at higher frequencies Double-shielded coaxial cable (Fig 3-1L) provides an extra measure of protection against radiation from the line, and EMI from outside sources, from getting into the system Stripline, also called microstripline (Fig 3-1M), is a form of transmission line used at high UHF and microwave frequencies The stripline consists of a critically sized conductor over a ground-plane conductor, and separated from it by a dielectric Some striplines are sandwiched between two groundplanes and are separated from each by a dielectric
64 Transmission lines
Transmission line characteristic impedance (Zo)
The transmission line is an RLC network (see Fig 3-2), so it has a characteristic impedance Zo, also sometimes called a surge impedance Network analysis will show that Zo is a function of the per unit of length parameters resistance R, conductance G, inductance L, and capacitance C, and is found from Zo = where Zo is the characteristic impedance, in ohms R is the resistance per unit length, in ohms G is the conductance per unit length, in mhos L is the inductance per unit length, in henrys C is the capacitance per unit length, in farads is the angular frequency in radians per second (2 F) R+j L G+j C [31]
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