Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola
Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola
Design of Antennas for Handheld DVB-H ... - Lunds tekniska högskola
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6.3 Control signal<br />
6.4 Cost<br />
The switched monopole 2 needs the most complex control signal to work<br />
properly. For the switches used in this prototype three digital control signals are<br />
needed to control the switches. To control the loop antenna an analogue DC<br />
voltage between 0.5 and 3.0 V is required. This DC voltage can be the same that<br />
controls the VCO in the tuner. A big advantage with the folded-patch antenna is<br />
that no control signal is required.<br />
The manufacturing cost varies a lot between the different prototypes. The most<br />
expensive antenna solution will probably be the switched monopole 2 since the<br />
two switches and the expander are expensive circuits. The switches we used from<br />
Peregrine can be bought <strong>for</strong> about $1 each and the expander costs $1.50. For this<br />
solution three inductors and four capacitances are also required. The inductors<br />
cost $0.02 each and the capacitors cost $0.005 a piece. Which adds up to about<br />
$3.60 <strong>for</strong> components only. Hopefully the <strong>DVB</strong>-H chipset will be able to deliver<br />
the needed control signal and then the expander is not needed. There are cheaper<br />
switches on the market that are possible to use in this concept, our time limit did<br />
not allow us to test these.<br />
The second in line is the loop antenna, mostly because the variable capacitance<br />
diodes are relatively expensive. One variable capacitance diode cost about $0.30.<br />
One capacitor and one inductor are also needed <strong>for</strong> this prototype so the total<br />
component cost adds up to about $0.60. The folded patch antenna does not need<br />
any components. However this prototype and the loop antenna will need a slightly<br />
more expensive mechanical solution than the switched monopole 2.<br />
All prices are approximations and apply when one component is bought, if the<br />
antennas were to be mass-produced the prices will be significantly lower.<br />
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