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

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Abstract DVB-H is a standard that makes it possible to deliver live broadcast television to handheld terminals. It is developed from the DVB-T standard, which makes it possible to send DVB-H signals along with DVB-T signals in the same multiplexer, in the DVB-H/T frequency band 470-862 MHz. A benefit with this is that it is possible to reuse the DVB-T transmission equipment. The differences between DVB-H and DVB-T are some additions that improve the features for a mobile terminal in the DVB-H standard. The most important additions are the time slicing, in order to reduce the average power consumption, and MPE-FEC for improving Doppler performance and tolerance against interference. A big challenge in developing terminals for the DVB-H system is the antenna. The problem is the low frequencies and the small size of today’s handheld terminals. The result is electrically small antennas that are difficult to get good efficiency with. The large bandwidth is another big problem when designing antennas for DVB-H. After an introduction of the DVB-H system this master thesis investigates different solutions for both external and internal antennas for the DVB-H system, such as PIFA, loop antenna, monopole and dipole. The investigation takes RF performance, size, design, complexity and cost in consideration when evaluating the proposals for DVB-H antennas. I
Acknowledgements This master thesis is our final thesis at the Master of Science programme in Electrical engineering at Lund institute of technology. To start with we would like to thank our supervisors Anders Sunesson and Dag Mårtensson for giving us the chance to work with this interesting thesis and all support during the work. We also would like to thank the entire RF engineer team at Perlos who have supplied us with technical and antenna knowledge and helped us through a lot of the problems that have turned up during the work. We are also grateful to all other Perlos employees for the pleasant Wednesday meetings. Finally we would like to thank our supervisor Anders Karlsson at LTH. This work has been supported and funded by Perlos AB in Lund. II
Page 1: Design of Antennas for Handheld DVB
Page 5 and 6: 4 DESIGN AND TESTING OF ANTENNA SOL
Page 7 and 8: Figure 5.2. Reference dipole antenn
Page 9 and 10: 1 Introduction The passed decade th
Page 11 and 12: 2 Background This chapter provides
Page 13 and 14: is simultaneously modulated into 10
Page 15 and 16: 2.1.3 Reed-Solomon Codes 2.1.4 DVB-
Page 17 and 18: 2.1.5 DVB-H DVB-H is the latest dev
Page 19 and 20: 2.1.5.2 Time slicing A large proble
Page 21 and 22: figure 2.5). All three elements tog
Page 23 and 24: symbols or four 2K OFDM symbols. Th
Page 25 and 26: 2.2 Competing standards The DVB-H s
Page 27 and 28: 2.3 Antenna theory This section des
Page 29 and 30: Figure 2.9. Impedance bandwidth def
Page 31 and 32: unloaded quality factor (Q0) and th
Page 33 and 34: 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
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antenna. The dimension of the anten
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The result of the return loss measu
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Figure 4.24. Return loss graph for
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The result of the measurement of th
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Figure 4.31. Return loss graph for
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frequency band, the first from 470
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Figure 5.6. Radiation pattern for R
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5.1.3 Measurement result In this ch
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Figure 5.10. Radiation pattern for
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Table 5.4. Switched monopole 1, gai
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Power gain / dB 2 0 -2 -4 -6 -8 -10
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was received in all five channels.
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6.3 Control signal 6.4 Cost The swi
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not be possible, there will always
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There are many advantages with tuna
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8 References [1] Schiller, Jochen -
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[29] Gardiol, Fred - Microstrip cir
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Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola

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