*HQHUDO Gerber files layouts have been made Nordic VLSI's Single
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nRF902 antenna layout
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Gerber files layouts have been made Nordic VLSI's Single Chip 868MHz Transmitter [1]. loop antenna 868MHz also been made available. Gerber files each layout compressed into archive format. archive files includes file named UHDGPHZUL that must read before importing Gerber files into editor. described layouts should fabricated standard 1.6mm double-sided printed circuit board.
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layouts include necessary circuitry design radio frequency part short range communication system based Q5). transmitter data control lines DIN, XO8, PWR_DOWN, CLOCK/ASK, available perimeter layout should connected digital part customer's application. also available perimeter layout. part application circuit should filtered separately from supply voltages digital circuitry. Star routing strictly recommended from supply source digital other parts application circuit. layouts presented below equal except antenna connection circuitry. Solutions differential connection loop antenna single ended connection antenna presented. 'LIIHUHQWLDO FRQQHFWLRQ ORRS DQWHQQD Figure shows schematics layout with differential connection loop antenna. layout shown Figure loop antenna layout described chapter easily placed together with this layout. connection points numbered loop antenna layout must connected exactly corresponding connection points numbered layout. Gerber files archive filename 3&%BQ5)BGLII]LS. recommended external components given Table
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ceramic chip capacitor (REXT decoupling) ceramic chip capacitor (REXT decoupling) ceramic chip capacitor (Supply decoupling) ceramic chip capacitor (Supply decoupling) ceramic chip capacitor (Supply decoupling) Tantalum chip capacitor (Supply decoupling) ceramic chip capacitor (Data stream filter) 0.1W chip resistor (Crystal oscillator bias) 0.1W chip resistor (Transmitter power setting) 0.1W chip resistor (XO8 output level setting) 0.1W chip resistor (Data stream filter/Frequency deviation setting) 0.1W chip resistor (Data stream filter/Frequency deviation setting) Crystal
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0603 0603 0603 0603 0603 3216 0603 0603 0603 0603 0603 0603
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13.5774
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Table Recommended External Components.
[1].
6LQJOH HQGHG FRQQHFWLRQ DQWHQQD XVLQJ GLIIHUHQWLDO VLQJOH HQGHG PDWFKLQJ QHWZRUN Figure shows schematics layout with single ended connection antenna using differential single ended matching network. layout shown Figure antenna connection point should close possible output matching network. this possible practical reasons, track between output matching network antenna connection should carried microstrip line. such case, length microstrip line limited centimetres. standard printed circuit board with 1.54mm substrate thickness relative dielectric constant 4.25 868MHz, width microstrip line should 3mm. Gerber files archive filename 3&%BQ5)BVLQJOHBQHWZ]LS. recommended external components given Table with addition components differential single ended matching network given Table
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ceramic chip capacitor (Impedance matching) ceramic chip capacitor (Impedance matching) 0.1W chip resistor (Impedance matching) Chip inductor, SRF>868 (Impedance matching) Chip inductor, SRF>868 (Impedance matching)
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0603 0603 0603 0603 0603
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Table Recommended components differential single ended matching network
[1].
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4.7uF 3216
150k 0603 PWR_DOWN CLOCK/ASK aaaaaaaa 0603 13.5774MHz XTAL REXT ANT1 ANT2 Loop antenna connection 33pF aaaaaaaa 0603
0603
33pF 0603
4.7nF 0603
4.7nF 0603
33pF 0603
nRF902 868MHz Single chip Transmitter SOIC
3.9K 0603
0603 680pF 0603 aaaaaaaa
Figure Schematics layout with differential connection loop antenna
silk screen
Bottom silk screen
view
Bottom view
Figure layout with differential connection loop antenna
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4.7uF 3216
33pF 0603
150k 0603 PWR_DOWN CLOCK/ASK aaaaaaaa 0603 13.5774MHz XTAL REXT ANT1 ANT2
0603 0603
68nH 0603 15nH 0603 3.3pF 0603
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33pF 0603
4.7nF 0603
4.7nF 0603
33pF 0603
nRF902 868MHz Single chip Transmitter SOIC
3.3pF 0603
3.9K 0603
0603 680pF 0603 aaaaaaaa
Figure Schematics layout with single ended connection antenna using differential single ended matching network
silk screen
Bottom silk screen
view
Bottom view
Figure layout with single ended connection antenna using differential single ended matching network
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loop antenna with T-match good solution cost small size radio modules. layout solution small rectangular loop antenna described below. Figure shows basic geometry designed rectangular loop antenna.
Figure Geometry rectangular loop antenna loop antenna physical parameters loop antenna length [mm] loop antenna width [mm] feed length [mm] width loop conductor
antenna tuned resonance frequency 868MHz with chip capacitors keep variations antenna gain capacitor variations lower than thus achieve reproducible values antenna gain mass production, total tuning capacitance tolerance should exceed (that ±2.5%). According [2], antenna should then designed Q-value about designed loop antenna, capacitors should have tolerances equal better than ±0.1pF. resistor controls 4-value antenna. loop antenna tuned approximately with T-match. width loop conductor 1.524mm (60mil). There ground plane beneath antenna. Table shows summary designed loop antenna.
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9.5x9.5
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±0.1
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±0.1
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±0.1
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Table Summary loop antenna
Thick film chip resistor with resistance tolerance better.
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component values given Table only valid when connection points numbered loop antenna layout, shown Figure connected exactly corresponding connection points numbered layout with differential loop antenna connection. component footprints used loop antenna layout size 0603. layout rest communication system influence antenna tuning require measurement antenna together with complete system order find values your system.
Figure Loop antenna layout (not actual size) recommended that system should designed with longer communication range than application requires. Estimations communication range with antenna presented this application note receiver with given sensitivity antenna gain, made based theory given [2]. Initial communication range tests should carried with lowest output power setting that, based estimations, satisfies range requirements. achieved communication range does satisfy requirements, output power should increased required level. Table lists Gerber file archive filename antenna layout.
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9.5x9.5
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Loop_9.5x9.5mm_868MHz.zip
Table Gerber files archive filenames Measured loop antenna gain relative dipole antenna mounted 40x40cm ground plane shown Table
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9.5x9.5
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Table Measured loop antenna gain relative dipole antenna mounted 40x40cm ground plane
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Product Specification Q5), "868MHz Single Chip Transmitter", Nordic VLSI ASA. Application note Q$1, "Small loop antennas", Nordic VLSI ASA.
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Nordic VLSI reserves right make changes without further notice product improve reliability, function design. Nordic VLSI does assume liability arising application product circuits described herein.
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These products designed life support appliances, devices, systems where malfunction these products reasonably expected result personal injury. Nordic VLSI customers using selling these products such applications their risk agree fully indemnify Nordic VLSI damages resulting from such improper sale.
Application Note. Revision Date 04.10.2001. Application Note order code 041001-nAN900-01 rights reserved Reproduction whole part prohibited without prior written permission copyright holder.
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Revision:
October 2001
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