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Do you want to convert an PDF file to Word ? Don't download software - use Zamzar to convert it for free online. Click to convert your PDF file now. The impedance of an antenna is the sum of its radiation resistance and its ohmic resistance and any reactive components Power absorbed by the radiation resistance results in power radiated into space, and power absorbed by the ohmic resistance is converted to heat and wasted Radiation resistance varies with antenna length Resistance increases as the electrical length of the antenna increases An antenna circuit can be analyzed as a simple series circuit with resistive, inductive, and capacitive (RLC) reactance All of these quantities vary with the length of the antenna For an antenna much smaller than half the wavelength of the signal, resistance and inductance are very small and capacitance is quite large As the antenna length increases, resistance and inductance increase while the capacitance decreases An antenna size equal to approximately a half wavelength, capacitance and inductance are equal and cancel each other out, and the resistance is called antenna impedance One of the goals of antenna design is to minimize the reactance of the device so that it appears as a pure resistive load Reactance causes energy to be wasted as heat Reactance can be eliminated by operating the antenna at its resonant frequency, where its capacitive and inductive reactances are equal and opposite, resulting in a net zero reactive current Once the reactance has been eliminated, what remains is a pure resistance, which is the sum of two parts: the ohmic resistance of the conductors and the radiation resistance The greater the ratio of radiation resistance to ohmic resistance, the more efficient the antenna becomes Different parts of the antenna systems, such as interrogator, feed line, antenna, and free space, may have different impedance At each interface between differing impedance, some fraction of the wave s energy reflects back to the source This reflection back to the source and the original wave traveling forward form a standing wave The ratio of maximum power to minimum power in the wave can be measured and is called the voltage standing wave ratio (VSWR) The ideal value for VSWR is 1:1, which corresponds to a perfect impedance match Minimizing impedance differences at each interface (impedance matching) will reduce VSWR and maximize power transfer through each part of the antenna system Therefore, VSWR is a measure of impedance mismatch between the two interfaces in the antenna system Almost all radio equipment is built for an impedance of 50 ohm The higher the VSWR, the greater the mismatch and lesser the power radiated A value of 2:1 VSWR, which is equal to 90 percent power absorption, is considered very good for a small antenna; 3:1 is. best free online pdf to word converter for mac: Convert PDF to Word - Free Online PDF to Word Converter pdf to word converter for mac online PDF To Word Converter Free - Download
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Convert PDF (Portable Document Format) to DOCX (Microsoft Word Open XML Document) in high quality using this free online file converter. bands (some licensed and some license-exempt,) which, coupled with a high bandwidth capability in excess of 1 GHz, allows the communication of multimedia services with interactive facilities within a 3 mi (5 km) radius of a central data hub For the point-to-multipoint (PMP) architecture, the operator installs base stations around the market area that are very similar to traditional cellular systems,9 and each cell contains a hub with multiple radio nodes equipped with sector antennas for PMP and directional antennas for PP connections Base stations have antennas that transmit and receive on multiple sectors, and typical configuration is four sectors using 90 beamwidth antennas The subscribers use antennas that are installed on their rooftops, pointing in the direction of the maximum signal strength from the base station Similar to cellular system, frequencies are reused in neighbor base stations or sectors, as long as the reuse distances are defined so as to avoid interference These systems provide the bandwidth on demand, which is achieved by use of ATM or IP/Ethernet (and statistical multiplexing) as a transport mechanism Since the bandwidth is shared with other users, bandwidth available per subscriber is reduced with every new subscriber using the system For subscribers who demand fixed bandwidth availability, a point-topoint system can be offered that will not share bandwidth with other subscribers Figure 214 shows a typical system architecture based on the dynamic bandwidth allocation and ATM convert pdf to powerpoint online: Convert your file to Powerpoint PPT - Online converter secured pdf to word converter online free marathi pdf converter free download - SourceForge
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PDF to Word conversion in three easy steps. Step 1: Upload your PDF file. Drag your PDF file on to the dropzone above, or click Upload to choose a file from your computer. Step 2: Convert PDF to Word . Step 3: Download your file. Get 3 Free downloads of your DOC file. No sign up required. Millimeter-wave (MMW) characteristics dictate short-range lineof-sight propagation (rain attenuation) with minimal refraction and reduced interference Line-of-sight between the hub site and all the customer sites is required, similar to classic point-to-point microwave systems Therefore, standard microwave propagation and prediction methods are used for the system design In addition, frequency coordination with other spectrum owners and PMP service providers must be carefully planned In urban areas, only low LOS penetration rates are achievable, due to obstructions from buildings, vegetation, and other obstacles One inexpensive option (at certain frequencies) to increase penetration might be the use of reflected and diffracted waves in the non-line-of-sight (NLOS) areas, if attenuation due to reflection or diffraction is smaller than a certain available system margin10 The use of reflected waves depends very much on the roughness of the surface under consideration For very rough building walls with a standard deviation of the roughness close to or more than l/2, only reflected waves of grazing angles can be used However, since roughness of building walls is often small compared to the millimeter wavelengths, reflection coefficients can be less than the system margin over a wide range of the angle of incidence PMP can use FDMA, TDMA, or spread-spectrum (DS or FH) overthe-air interface as well as frequency-division duplex (FDD) or timedivision duplex (TDD) There is a debate about TDD versus FDD in point-to-multipoint networks While TDD requires a single channel for full-duplex communications, FDD systems require a paired channel for communication, one for the downlink (hub to remote), and one for the uplink (remote to hub) In TDD, transmit/receive separation occurs in the time domain, as opposed to FDD, where it occurs in frequency domain While FDD can handle traffic that has relatively constant bandwidth requirements in both directions, TDD handles better varying uplink/ downlink traffic (bursty traffic data, Internet) asymmetry by allocating time spent on up- and downlinks TDD requires a guard time equal to the round-trip propagation delay between hub and remote units and increases with link distance In FDD, sufficient isolation in frequency between the uplink and downlink is required, so FDD is a simpler but less efficient solution. adobe acrobat pdf to word converter online free PDF to Word: Convert PDF to DOCX and PDF to DOC online free
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