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Rating 4.7 stars (108,760) The dipole antenna is simply two thin conductors (wires) pointed in opposite directions, arranged either horizontally or vertically, with one end of each conductor connected to the feed line and the other end hanging free in space Both the conductors usually have the same lengths, and their combined length determine the antenna s wavelength The two conductors are driven by a voltage applied to the feed line in the middle The ideal length for a dipole antenna tuned to 915 MHz is about 16 cm (65 inches) It is has a modest gain of 215 dBi Since this is the simplest practical antenna, it is also used as a reference model for other antennas When a dipole is used as a reference to calculate gain of an antenna, the gain of that antenna is expressed as dBd Variations of the dipole include folded dipole, half-wave antenna, and monopole Monopole is half the dipole Monopole antennas are vertical antennas erected on the ground, where the ground, being a conductive material, acts as a reflector, providing an image of the monopole and effectively creating the dipole Monopole antennas are used for radio transmission, but they are generally less efficient than equivalent dipole antennas Figure 2-15 shows dipole and monopole antennas Generally, the dipole has a toroidal (donut-shaped) radiation pattern, where the axis of the toroid is aligned with the axis of the dipole This pattern is shown on the left side of Figure 2-16 Most of the power transmitted by a dipole is in horizontal (H) plane with an omnidirectional pattern In the other two planes, mac pdf to word online: Convert scanned PDF to editable Word - OCR online pdf to word converter for mac online Convert PDF to Word - SimplyPDF
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Convert your PDF file into editable word documents with the best PDF to Word converter. Preserve the PDF files' fonts, paragraphs, lists, tables, and columns in ... from its normal propagation conditions for short periods of time and experience detrimental propagation effects Various clear-air fading mechanisms caused by extremely refractive layers in the atmosphere must be taken into account in the planning of links of more than a few miles in length: beam spreading (commonly referred to as defocusing), antenna decoupling, surface multipath, and atmospheric multipath Most of these mechanisms can occur by themselves or in combination with each other Multipath fading is the dominant fading mechanism for frequencies lower than approximately 10 GHz A reflected wave causes a phenomenon known as multipath, meaning that the radio signal can travel multiple paths to reach the receiver Typically, multipath occurs when a reflected wave reaches the receiver at the same time as the direct wave that travels in a straight line from the transmitter Multipath propagation gives rise to two kinds of signal degrading effects, ie, flat fading and frequency selective fading The flat fading effect is due to thermal noise and interference Certainly, both flat and selective fading typically occur in combination Two scenarios of multipath are possible: If the two signals reach the receiver in phase, then the signal is ampli ed This is known as an upfade Upfades can also occur when the radio wave is trapped within an atmospheric duct As can be seen from the following formula, higher upfades are possible for longer paths: Upfademax = 10 log d 003d (dB) (38) Remember that a dipole antenna has nulls at its north and south poles Therefore, when a tag antenna pole is pointing in the direction perpendicular to interrogator antenna plane, the tag cannot be interrogated If the two waves reach the receiver out of phase, they weaken the overall received signal If the two waves are 180 apart when they reach the receiver, they can completely cancel each other out so that a radio does not receive a signal at all A location where a signal is canceled out by multipath is called a null or downfade When several antenna elements usually single wire dipoles and reflectors are combined, they form an antenna array This provides a particular Under fading conditions, the direct signal may be attenuated and/ or distortion increased to the point where frequency selective notches result and dispersive fading occurs Such distortion results in ISI (intersymbol interference) in the demodulator, an increase in data signal BER, and a possible loss of data signal recovery Smooth surfaces, such as a body of water, a flat stretch of earth, or a metal roof, reflect radio signals In Figure 36, the body of water free pdf to word converter for mac online Free Online OCR - convert PDF to Word or Image to text
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