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

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Since the measurements for the prototypes and the reference antennas are made for the same number of points in the sphere we can compare TRP directly to calculate the efficiency (see equation 5.4) [28]. Prad, prototype TRPprototype e 0 = ⋅ 0. 9 = ⋅ 0. 9 (5.4) P TRP rad, reference. antenna reference. antenna Where 0.9 is the estimated efficiency for our reference antenna. To calculate the power gain and efficiency for our prototypes, we have to measure and calculate received signal strength and TRP for all four antennas. To get more accurate calculations all measurements was made three times and a mean value was calculated (see table 5.1). Table 5.1. Reference antenna values for calculation of gain and efficiency. Frequency /MHz Received signal strength /dBm TRP /mW 470 -47.9 0.00351 490 -47.3 0.00426 510 -47.0 0.00473 530 -45.9 0.00491 550 -44.7 0.00644 570 -44.0 0.00795 590 -43.7 0.00972 610 -42.8 0.01167 630 -42.4 0.01156 650 -43.5 0.0092 670 -43.2 0.00836 690 -43.4 0.00868 710 -44.5 0.00791 58
5.1.3 Measurement result In this chapter the results of the anechoic chamber measurement for the different prototypes are presented. The results are discussed in chapter 7, Conclusions. Power gain / dB 2 0 -2 -4 -6 -8 -10 -12 Folded-patch 1 vs. specification 470 510 550 590 630 670 710 Frequency / MHz 59 Specification Figure 5.7. Gain for the folded-patch 1 versus specification. Folded-patch 1 Table 5.2. Folded-patch 1 gain and efficiency results. Folded patch 1 Frequency / MHz Gain / dB Efficiency / % 470 -3.72 19.4 530 -2.72 40.5 590 -1.04 47.2 650 -2.68 41.2 710 -4.68 27.3
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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
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
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: Figure 5.6. Radiation pattern for R
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 and 86: There are many advantages with tuna
Page 87 and 88: 8 References [1] Schiller, Jochen -
Page 89: [29] Gardiol, Fred - Microstrip cir
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Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola

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