Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola

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• Frequency range 470-862 MHz, 470-702 MHz together with GSM 900 transmitter. • Bandwidth 392 MHz (58.9 %), 232 MHz (39.6 %) together with GSM 900 transmitter. • Channel bandwidth 5, 6, 7 or 8 MHz. • Minimum power gain –10 dBi at 474 MHz linearly increasing to –5 dBi at 858 MHz. • 50 Ω impedance matching. • As omni directional radiation pattern as possible. • Polarisation problem can be an issue. • A filter is needed on the DVB-H chipset input to block GSM 900 signal and a LNA is preferable. This is not an antenna issue but as high isolation against GSM 900 as possible is wanted. • Low efficiency will be tolerated due to the electrically small antennas. • The DVB-H chipset sets the sensitivity level, today’s chipset have a level of about –95 dBm. We still have some prototypes to evaluate. The most interesting is to replace the switches and the matching circuits with a balun and variable capacitance diodes in the switch monopole 2. This way the antenna could be controlled by an analogue control voltage and no expensive switches have to be used. We planned to do isolation measurements of the different prototypes but we did not have enough time for this. These are important measurements that have to be done to be able to decide the filter characteristic. To be able to verify and to get some more reliable measurement results it would have been interesting to do measurements in a larger chamber suitable for DVB-H frequencies. 78
8 References [1] Schiller, Jochen - Mobile Communications, Addison Wesley, 2003 [2] DVB – History of the DVB Project http://www.dvb.org/ [3] Almgren, Hanna and Vestin, Johanna - Scalable Services Distributed over DAB and DVB-T from a Receiver Point of View, Mar 2002. [4] Teracom http://www.teracom.se/?page=267 [5] Orthogonal Frequency Division Multiplexing, Intel, 2004. [6] Reimers, Ulrich – DVB - The Family of International Standards for Digital Video Broadcasting, Springer-Verlag Berlin Heidelberg, 2005. [7] Molisch, Andreas F. - Wireless digital communication Lunds Tekniska Högskola, Jan 2005. [8] Intini, Aníbal Luis - Orthogonal Frequency Division Multiplexing for Wireless Networks, University of California Santa Barbara, Dec 2000. [9] 4i2i http://www.4i2i.com/reed_solomon_codes.htm [10] Bria, Aurelian and Barquero, David G´omez - Scalability of DVB-H Deployment on Existing Wireless Infrastructure, Royal Institute of Technology, Sweden and Polytechnic University of Valencia, Spain. [11] Arjona Andres - Internet Protocol Datacasting Telecommunications Software and Multimedia Laboratory, Espoo, 2005. [12] Kornfeld, Michael and Reimers, Ulrich - DVB - The emerging standard for mobile data communication, Institute for Communications Technology, Jan 2005. [13] Quinnell, Richard A - Digital video goes mobile Test & Measurement World, Mar 2005 79
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Design of Antennas for Handheld DVB
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Acknowledgements This master thesis
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4 DESIGN AND TESTING OF ANTENNA SOL
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Figure 5.2. Reference dipole antenn
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1 Introduction The passed decade th
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2 Background This chapter provides
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is simultaneously modulated into 10
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2.1.3 Reed-Solomon Codes 2.1.4 DVB-
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2.1.5 DVB-H DVB-H is the latest dev
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2.1.5.2 Time slicing A large proble
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figure 2.5). All three elements tog
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symbols or four 2K OFDM symbols. Th
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2.2 Competing standards The DVB-H s
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2.3 Antenna theory This section des
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Figure 2.9. Impedance bandwidth def
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unloaded quality factor (Q0) and th
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losses should be avoided in handhel
Page 35 and 36: 3.3 Loop Figure 3.1. Yagi-Uda anten
Page 37 and 38: PIFA Figure 3.2. Four different con
Page 39 and 40: The size of the antenna is another
Page 41 and 42: 4.4 PIFA To verify the balun a resi
Page 43 and 44: 4.5 Folded-Patch With the PIFA-ante
Page 45 and 46: Figure 4.9a. Folded-patch 2, front
Page 47 and 48: Figure 4.11. Loop antenna schematic
Page 49 and 50: Figure 4.15. Wire loop antenna retu
Page 51 and 52: using an H-field antenna together w
Page 53 and 54: antenna. The dimension of the anten
Page 55 and 56: The result of the return loss measu
Page 57 and 58: Figure 4.24. Return loss graph for
Page 59 and 60: The result of the measurement of th
Page 61 and 62: Figure 4.31. Return loss graph for
Page 63 and 64: frequency band, the first from 470
Page 65 and 66: Figure 5.6. Radiation pattern for R
Page 67 and 68: 5.1.3 Measurement result In this ch
Page 69 and 70: Figure 5.10. Radiation pattern for
Page 73 and 74: Table 5.4. Switched monopole 1, gai
Page 75 and 76: Power gain / dB 2 0 -2 -4 -6 -8 -10
Page 79 and 80: was received in all five channels.
Page 81 and 82: 6.3 Control signal 6.4 Cost The swi
Page 83 and 84: not be possible, there will always
Page 85: There are many advantages with tuna
Page 89: [29] Gardiol, Fred - Microstrip cir
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