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

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Figure 4.22a. Return loss graph with matching circuit 1 and 2 for switched monopole without switches. Figure 4.22b. Return loss graph with matching circuit 3 and 4 for switched monopole without switches. 46
The result of the return loss measurement was satisfactory and it was decided that instead of this prototype a switched monopole with two RF switches should be built. To verify that the switch worked correctly and to make it possible to find out how one switch affects the characteristic of the antenna a prototype with just one switch was designed. The RF switch is connected between the matching circuits and the antenna element and between the matching circuits and the antenna feed it was needed to solder to switch between the different matching circuits. This switched monopole prototype is called switched monopole 1 from now on. The antenna that is called switched monopole 2 is exactly the same as switched monopole 1 besides that it has a switch before the matching circuit and it has different values of the matching components. The RF switch that is used for these two prototypes is an antenna switch from Peregrine (PE4268), other switches have been tested but without satisfactory result. The used switches need three digital control signals that could be withdrawn from an I2C-bus that the chipset provides. The I2C-bus can be connected to the expander MAX7313 circuit that can be programmed to provide the desired control signals. An alternative to this solution could be if the chipset could deliver these signals directly. The switched monopole 1 and 2 are built with a ground plane and an antenna element with the same size as the switched monopole described above and with the same distance between ground plane and antenna element. In figure 4.23 a picture is shown of the switched monopole 2. 47
Page 1 and 2:
Design of Antennas for Handheld DVB
Page 3 and 4: Acknowledgements This master thesis
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
Page 53: antenna. The dimension of the anten
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 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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