Therefore, the radiation aperture of this dual-band array is controlled so as to ensure a constant gain profile at both operating frequencies. The effect of extending the open-circuited feed line is illustrated in Figure 8.40. 1592−1596, May 1997. Integration of Antennas for Different Operating Bands. S. Krishnan, P. Sharma, G. Zhang, and H. W. Ong, “A UWB based location system for indoor robot navigation,” IEEE International Conference on Ultra-Wideband, Singapore (September 2007): 77–82. What those advanced services will look like, sound like, and feel like is the theme of the book Advances in Mobile Computing and Communications: Perspectives and Emerging Trends in 5G Networks. 8.2.1.2 UHF/MWF Reader Antenna Design Considerations Compared to the loop antennas in LF/HF RFID applications, UHF/MWF reader antennas have a number of variations wherein the most commonly used is the circularly polarized patch antenna. Metallic screws are also used as shorting pins or as support at the noncritical portions of the antenna, e.g., the center of a patch antenna. Besides the broadband impedance matching and consistent gain, this antenna also features broad beamwidth in the azimuth plane and low cross-polarization. 2 (March 1972): 130–134. Figure 6.28 illustrates the measured and simulated gain curves of the antenna. A measured 3-dB AR bandwidth of 818−964 MHz is obtained. Finally, a comparison among these cases in electrical performances, including impedance bandwidth, beamwidth, crosspolarization, and back radiation is presented. 1.3 mm) z l2 h2 h l1 x h1 f Figure 7.20 Antenna element geometry Antennas for WLAN (WiFi) Applications 283 Top frame cover (metal) 126 10 125 150° P9 Panel P10 P11 P5 P1 31.7 P2 28.2 P6 P12 10 P7 P8 P3 P4 65 Figure 7.21 mm MIMO antenna array configuration the L-shaped feeding plate increases the capacitance at the feed point to compensate for the increase in the inductance due to the probe across a broad bandwidth. 15. The upper patch is a parasitic element, whereas a meandering probe feeds the lower patch. 90 135 180 Measured gain pattern of the antenna element in x-y plane 10 0 Gain, dBi −10 −20 3.5 GHz 4.0 GHz 4.5 GHz 5.0 GHz −30 −40 y-z plane −50 −180 Figure 8.46 −135 −90 −45 0 45 Angle, (q), deg. Unable to add item to List. Antennas Propagat., vol. 1 (January 2005). See coverage cell shape, 132 cells, 132 cellular networks. Some commercial RFID tags are shown in Figure 8.3. Therefore, if this antenna is stacked vertically, the distance between antennas is only about 1l at 2 GHz. A short summary of this paper. By eliminating the need for cables, data capture products using WPAN technology Antennas for Wireless Personal Area Network Applications 293 provide great convenience, utility, safety, and cost reduction. PIFAs for Internal Mobile Phone Antennas. Technol. Dimensions of the metal plates: L2 = 280 mm, W2 = 80−280 mm 326 Chapter Eight TABLE 8.2 Measured Resonant Frequency and Relative Magnetic Field Intensity of the Antenna with Bottom-Placement and Side-Placement Metal Plates Dimensions of the metal plates L3 × L4 × W3 × W4 (mm) 280 × 280 × 280 × 0 13.80 280 × 280 × 280 × 80 13.89 280 × 280 × 280 × 130 13.95 280 × 280 × 280 × 180 13.95 280 × 280 × 280 × 230 14.00 280 × 280 × 280 × 280 14.07 280 × 500 × 280 × 80 13.89 280 × 900 × 280 × 80 13.90 Resonant frequency (MHz) Relative magnetic –34.53 –35.12 –35.13 –35.32 –35.40 –35.41 –35.20 –35.22 field intensity (dB) at the center of the metal plates. 7.4.7 Three-Element Dual-Band MIMO Antenna S-parameters and correlation, dB Figure 7.27 shows a dual-band (2.4 GHz/5.1−5.9 GHz) MIMO PIFA array arranged in a triangular fashion as well as its impedance, correlation, and radiation performance. Therefore, the width of the antenna, W, is one of the key parameters for adjusting the proper amplitude and phase of the two current elements for achieving equal E- and H-plane radiation patterns. J. P. Kermoal, L. Schumacher, F. Frederiksen, and P. E. Mogensen, “Polarization diversity in MIMO radio channels: Experimental validation of a stochastic model and performance assessment,” Proc. These antennas are employed at base stations that serve a lot of traffic, which severely disturb, through interference, a large number of neighboring cells. In Release 7, 2 × 1 and 4 × 2 configurations employing space-time block coding were used, whereas in Release 8 (TSGR1(04)0336(2004)), the 2 × 2 and 4 × 4 configurations were employed. Most of the telecommunications services that occupy the allocated spectrum would prefer to keep UWB out of their frequency ranges. AP-49, no. S. Gruszczyn´ski, K. Wincza, and K. Sachse, “Reduced sidelobe four-beam N-element antenna arrays fed by 4 x N Butler matrices,” IEEE Antennas and Wireless Propagation Letters, vol. Its unique, comprehensive coverage written by top experts in their fields promises to make the Handbook of Antennas in Wireless Communications the standard reference for the field. 8. A cellular communication base station is an apparatus for transmitting and receiving electromagnetic waves in the radiofrequency (RF) range and it is the site through which cellular devices communicate with communication systems deployed throughout the world. New Unidirectional Antennas for Various Wireless Base Stations 0 0 Eco Hco 30 330 −10 60 300 −20 −30 90 270 −20 −10 120 Conventional dipole 240 0 210 0 330 180 150 0 Eco Hco 30 −10 60 300 −20 −30 90 270 −20 −10 240 120 0 210 0 330 180 Planar flat dipole 150 0 Eco Hco 30 −10 60 300 −20 −30 90 270 −20 −10 240 0 120 210 180 Unidirectional complementary antenna 150 Radiation patterns for conventional dipole, planar dipole, and unidirectional complementary antenna at the center frequency of 2.5 GHz41 Figure 6.18 225 226 Chapter Six Figure 6.19 shows a comparison of the measured and simulated SWRs of the proposed antenna. Published: 29 May 2019 I have a preferred writer at this service and will stick to him for long! However, an accurate assessment of a system’s maximum reading 4 range requires knowing the interrogation field strength, Hmin, of the tag and the output power of the RFID reader. 56, no. This chapter has addressed the important issues related to antenna designs for two WPAN applications: radio frequency identification for assets tracking and ultra-wideband for target positioning. The 802.15.4a standard introduces new options for the physical layer in order to support higher data rates and accurate ranging capability, enabling new applications based on distance and the positions of the devices in the network. Multiple antennas can provide a processing gain to increase the base station range and improve coverage. In addition, the short pulse enables accurate TOA measurements with good multipath tolerance because the UWB radios can distinguish the directly transmitted signal and the multipath signal from ceilings, walls, and floors easily. H. Laboid, H. Afifi, and C. De Santis, Wi-Fi, Bluetooth, Zigbee and WiMAX, Dordrecht: Springer, 2007. The channel transfer matrix H is dependent on the propagation environment as well as the array configuration by using single or dual polarization and multibeam array structures at the base station and dipole 16 arrays at the mobile. This T-strip has two parameters: T1 = 9.5 mm (0.079l) and T2 = 27 mm (0.225l). Too much noise will degrade the quality of the received signals. Antennas Propogat., vol. J. T. Matheney, L. M. Lee, and D. D. Mondul, Apparatus and method for locating objects in a Three-Dimensional Space, US patent No. The vertical section of the L-shaped plate is separated from the vertical wall of the radiator and the horizontal section of the radiator. However, when the planar dipole is combined with the open end of a vertically oriented shorted patch antenna, as shown in Figure 6.18c, the beamwidths in the E- and H-planes become similar. 2. To detect the tagged items, a large number of reader antennas must be positioned inside the shelves, which are usually made of metal. The case of the meandering probe is aligned to the center of the patches and the ground plane. As the metal plate Antennas for Wireless Personal Area Network Applications 323 Return Loss, dB 0 −10 W1 = 280 mm W1 = 230 mm W1 = 180 mm W1 = 130 mm W1 = 80 mm Free space −20 −30 12 14 16 18 20 22 Frequency, MHz Measured return losses of the antenna with backplacement metal plates. A twin L-shaped probe fed patch antenna that operates at a center frequency of 5 GHz is shown in Figure 6.1. This antenna operates at the center frequency of 2.5 GHz. Found inside – Page iA comprehensive review to the theory, application and research of machine learning for future wireless communications In one single volume, Machine Learning for Future Wireless Communications provides a comprehensive and highly accessible ... There is a gap of 0.77 mm between the horizontal arm and the bottom side of the slot. Download it once and read it on your Kindle device, PC, phones or tablets. Quick Delivery, Justified pricing only at LSnet.in 6.3.1 Basic Principle To provide more detailed understanding of a complementary antenna consisting of an electric dipole and a magnetic dipole for achieving a unidirectional symmetric radiation pattern, this section begins with a review of the characteristics of several previous works available in the literature. 29. Also, the mutual coupling performance between the Antennas P4/P8 and P8/P12 are also provided. 38. Metal conductors having the same length as the reflector are symmetrically positioned in front of the reflector with a distance S between the dipole and the slender metal conductors. G. Kumar and K. C. Gupta, “Nonradiating edges and four edges gap-coupled multiple resonator broad-band microstrip antennas,” IEEE Trans. An array of radiating elements is required to manipulate the radiation patterns. 4.12.1 Case Study The coverage of a micro base station connected to an amplifier integrated sector antenna can be extended to get wide area macro cell coverage without any requiring increased equipment space. For an EIRP limitation of 4 W (36 dBm), the reader antenna gain cannot be more than 6 dBic when a 1 W (30 dBm) reader is used. 4. The sleeve antenna is a vertical dipole with the feed (transmission line) entering from one end of a . Such a concept has been used substantially in the development of antennas for base stations in wireless communications, the details of which will be found in this . In the column power amplifier array, a separate power amplifier is connected directly to each column of radiating elements, whereas the hybrid power amplifier array has a separate amplifier configuration located Multibeam array antenna Sector coverage column Dx −45° pol. 30 60 90 Figure 8.48 Measured peak amplitude pattern in the x-y plane TABLE 8.5 Effect of Reflector Size on Peak Amplitude Pattern Beamwidth Reflector Hexagonal Hexagonal Hexagonal d (mm) Beamwidth 90 69° 80 73° 70 78° 345 346 Chapter Eight TABLE 8.6 Effect of Reflector Shape on Peak amplitude Pattern Beamwidth Reflector Hexagonal Star-shaped Cylindrical d (mm) Beamwidth 90 69° 90 75° 90 80° d d d Figure 8.49 Different reflector configurations antenna element against the size of the hexagonal reflector. See VNAs vertical polarization, 7 vertical radiation pattern, 196–201 vertically oriented patch/planar dipole antennas, 222–228 vertical-plate pair, 214–217 VNA ports, 84 VNAs (vector network analyzers), 21–22, 82, 84, 316, 320 voice communications, 179 voltage standing wave ratio (VSWR) input impedance, 3, 59–60 Index load mismatches, 49–50 measurements, 3, 82 phase errors, 67 variable phase shifters, 76 VSWR. 27. 3. To reduce the space for antenna installation, one radome is used to cover two antennas. R. Q. Lee and K. F. Lee, “Experimental Study of the Two-Layer Electromagnetically Coupled Rectangular Patch Antenna,” IEEE Transactions on Antennas and Propagation, vol. Antennas for Base Stations in Wireless Communications presents a full picture of modern base station antenna technology--from fundamentals and parameters to engineering and advanced solutions--and highlights new technologies in antenna design with enhanced performance. the T. Tynderfeldt and M. Olsson, “Transmit diversity options for GSM/EDGE,” in Proceedings IEEE 59th Vehicular Technology Conference (VTC-Spring 2004), Milan, Italy, 490−494, May 2004. 18. Figure 7.21 shows the antenna array arranged in a twelve-sectored configuration. Part 3. It is fed via a 50-Ω coaxial probe with a diameter of 1.3 mm, which is connected to an L-shaped plate at the bottom of the radiator. 21. The narrowest bandwidth occurs at 800 MHz because of the strong coupling between the slot antenna and parasitic cylinder. 8 (August 1986): 977–984. Antennas for WLAN Applications. This page covers different types of antennas used in wireless communication.The basics and types of antennas include horn antenna,parabolic antenna,helical antenna,slot antenna,dielectric antenna,patch antenna,phased array antenna,dipole antenna,directional antenna,folded dipole antenna,ground plane antenna,YAGI antenna,Log periodic antenna etc. In Japan, the mobile communication system has been developed to align with the global International Mobile Telecommunications-2000 (IMT-2000) standard for third-generation (3G) mobile telecommunication Antenna Issues and Technologies for Enhancing System Capacity 179 services and equipment. The whole antenna is made of 0.3-mm-thick copper plates and its ground plane is made of an aluminum plate 160 mm × 160 mm with a 2-mm thickness. 70 70 60 60 50 50 40 40 30 30 20 20 10 10 0 0 217 Input Resistance (O) Input Resistance (O) New Unidirectional Antennas for Various Wireless Base Stations −10 −10 −20 0.5 1 1.5 2 2.5 Frequency (GHz) 3 −20 3.5 50 Figure 6.10 Simulated input impedance of the designed DFPA (© 2007 IEEE) 10 Antenna Gain (dBi) 8 6 The antenna gain attains a stable value of 8.5 dBi 4 2 0 Measured Gain Simulated Gain −2 −4 −6 −8 1 1.5 2 2.5 3 3.5 Frequency (GHz) Figure 6.11 Simulated and measured antenna gains of the devised DFPA50 (© 2007 IEEE) It is well understood that for the vast majority of broadband patch antennas, radiation performance is inevitably degenerated, especially in the E-plane, at higher operating frequencies. New regulations should be in place shortly. The antenna array configuration, the antenna element design, and the methods to control the beamwidth and restrain interference among antenna elements are discussed. In the early days of the 3G network, system capacity was sacrificed to using slim antennas that had the same coverage area as the 2G network.10 However, the HPBW, which is narrower than those in the 2G network, was used due to the increased number of subscribers.7,8 Due to these reasons and the effects of HPBW on system capacity, as shown in Figure 5.4 and Figure 5.5, the ratio of the HPBW to the sector division angle of around 0.75 was used to increase system capacity and reduce the areas without low-power levels. *5 Indicates the reader-to-tag communication technique. Part 15, Radio Frequency Devices, Federal Communications Commission, http:// www.fcc.gov/oet/info/rules/part15/part15-9-20-07.pdf. H. W. Lai and K. M. Luk, “Design and study of wide-band patch antenna fed by meandering probe,” IEEE Trans. The DS-UWB scheme is based on the original proposal by Freescale Semiconductor, Inc. (formerly known as XtremeSpectrum) and supported by the UWB Forum. New Unidirectional Antennas for Various Wireless Base Stations 207 This chapter focuses on the development of wideband directional antennas with low cross-polarization, a stable radiation pattern, steady gain, and a simple architecture. The length of the dipole, L, for the three cases is chosen to be 60 mm, which is equal to 0.5l at the operating frequency of 2.5 GHz. Found insideI highly recommend studying this book in detail.” —Ali Sadri, Ph.D., Sr. Director, Intel Corporation, MCG mmWave Standards and Advanced Technologies Millimeter wave (mmWave) is today's breakthrough frontier for emerging wireless mobile ... 19 (17 September 1998): 1805–1806. Figure 8.24c illustrates the antenna with bottom-placement and sideplacement metal plates. In its basic mode, the modulation is Bluetooth 294 Chapter Eight Gaussian frequency shift keying (GFSK). Antenna Issues and Technologies for Enhancing System Capacity 203 20. 21. The antenna unit is connected to a micro base station and a battery backup unit. Dimensions of the metal plates: L1 = 280 mm, W1 = 80 − 280 mm; separation: S1 = 10 mm Figure 8.26 becomes smaller (L1 = 280 mm, W1 = 80 mm), the relative magnetic field intensity (−35.0 dB) of the antenna is almost the same as that in free space (−34.8 dB). If a person used Operator A’s phone system, he or she couldn’t talk to his or her friend who was using Operator B’s system. 7.11 can be determined using Lagrange multipliers to obtain the water-filling solution.9−12 This method allocates power to the high-gain channels and generally does not use weaker channels. Capacity is enhanced by a multiplicative factor equal to the number of data streams. A consistent gain of 8 dBi is achieved over a bandwidth of 44% (2.3–3.6 GHz) by using a folded two-layer structure.39 The folded structure suppresses the occurrence of higher order modes when the height of the antenna is elevated beyond 10% of the free space wavelength l0. At the national level, each country has its own regulatory body to set the rules. However, the 2G systems in Japan couldn’t be used by those employing systems developed by foreign operators. IEEE 802.15, Wireless Personal Area Networks, IEEE Standards Organization, http://standards.ieee.org/getieee802/802.15.html. We guarantee 100% confidentiality and anonymity. Resorting to the use of a differential feed, two probes, having radii of 0.5 mm, are directly connected to the horizontal parts of the folded plates. Veh. To illustrate the performance gains possible, the paper describes research being conducted by . This process is conducted by electric/magnetic field coupling or electromagnetic wave capturing via the antenna. T. Vlasits, E. Korolkiewicz, A. Sambell, and B. Robinson, “Performance of a cross aperture coupled single feed circularly polarised patch antenna,” Electron. M. Golio, The RF and Microwave Handbook, Boca Raton, FL: CRC Press, 2000. 8.2.2.2 UHF/MWF Antenna Circularly polarized (CP) radiation can be achieved when two orthogonal modes of equal amplitude are excited with a 90° phase difference.28 In general, the feeding structures of CP antennas may be categorized into single and hybrid feeds. When the diameter of the hexagonal reflector decreases from 90 mm to 70 mm, the beamwidth of the peak amplitude pattern increases from 69° to 78°. The others are under development and the commercial products are expected in the near future. D. Supporting Structures In order to lower the Q-value of the antenna, TM material (e r ≈ 1.1), nylon and provide ample support, Styrofoam (er ≈ 3.5) stubs, rods, and screws are commonly used as supporting materials. Given its relatively symmetrical structure, the polarization is kept linear and cross-polarization is suppressed. A gap is formed between the two horizontal portions, in which the gap size, denoted as g, is determined by WH and s. Having one edge connected to a vertical part, each horizontal part, with the height of t = 2.5 mm (0.018lo), is driven by a probe. 11. The seven parts are ■ 18000–1: Generic parameters for air interfaces for globally accepted frequencies ■ 18000–2: Air interface for 135 KHz ■ 18000–3: Air interface for 13.56 MHz ■ 18000–4: Air interface for 2.45 GHz ■ 18000–5: Air interface for 5.8 GHz ■ 18000–6: Air interface for 860 MHz to 930 MHz ■ 18000–7: Air interface at 433.92 MHz Besides ISO, EPCglobal is another well-known standards body involved in the development of RFID standards for automatic identification and item management. The antenna consists of one printed dipole with a length of ~0.5l at 1.5 GHz with a parasitic conducting element with a length of ~0.5l at 2 GHz and two shorted stubs with lengths of about 0.2l at 800 MHz at the two ends of the dipole. This antenna design consists of two patch radiators suspended above a ground plane. For example, the diameter of the corner reflector antenna with the same HPBW of 120° as the antenna with a flat reflector is reduced to 0.3l from 0.53l, as shown in Figure 5.6b. A sectored antenna array is used for transmitting/receiving UWB signals; the main beam of the directional antenna elements is aligned at different directions; and a 360° circumference can be covered by using multiple antenna elements. Grating lobes occur when the spacing between the patches is greater than one wavelength, while a separation of less than one quarter wavelength increases the mutual coupling and reduces the radiation efficiency. 39 (December 1991): 1770–1776. Stable gain patterns are observed over the frequency band. The capacitance due to each horizontal part and the ground plane offers an additional design flexibility to accomplish good impedance matching. The rates are 20 Kbps and 40 Kbps per channel for the 868-MHz and the 915-MHz bands, respectively. An alternative way to find the DOA of a UWB pulse is to measure the amplitude difference of the UWB pulses received by a directional antenna array.23 Figure 8.14 illustrates the concept behind this method. An RFID system can read and process the data from a mobile device (i.e., a tag) by using an RFID reader according to a particular application’s need. Such an effect stems from MIMO system requirements. The advantages of using infrared technology include ■ Relatively high data rate when compared to other WPAN technologies (currently up to 4 Mbps) ■ Free from the interference caused by radio technologies ■ Low device cost ■ Lack of complicated addressing issues between devices Bluetooth9 is a short-range wireless technology endorsed by major technology companies and has now been accepted as the IEEE 802.15.1 standard. 9. Figure 8.9 illustrates the UWB emission power-level mask by FCC for indoor applications.16 8.1.3.2 IEEE 802.15.4a The IEEE 802.15.4 standard provides a framework for low data-rate communication systems, typically in sensor networks.17,18 The original 802.15.4 standard released in 2003 adopted a wideband physical layer using a Direct Sequence Spread Spectrum technique (DSSS). The resulting signal vector xA(t) drives the transmit transducer array, which in turn radiates energy into the propagation environment. This arrangement is equivalent to providing a magnetic dipole from the slot and an electric dipole from the inverted-L wires. 7, July 1997: 1031−1060. Optimal AR performance is achieved when the last probe is positioned at the edge of the strip line. The adoption of the variable tuning capacitor Cp3 (7−50 pF) enables the resonant frequency to be tuned from 13.28 MHz to 15.02 MHz, which offers great convenience for antenna tuning in practical applications where the antenna is often de-tuned by an adjacent object such as a metallic plate. There are a number of ways in which DS-UWB transmissions can be modulated to enable data to be carried.
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