nAN400-05 Gerber files layouts have been made Nordic VLSI's nRF40

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nAN400-05 Gerber files layouts have been made Nordic VLSI's nRF40

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nRF401 antenna layout
nAN400-05
Gerber files layouts have been made Nordic VLSI's nRF401 Single Chip 433MHz Transceiver [1]. Three different loop antennas 433MHz have also been made available. Gerber files each layout compressed into archive format. archive files includes file named readme.wri that must read before importing Gerber files into editor. described layouts should fabricated standard 1.6mm double-sided printed circuit board.
layout nRF401
layouts include necessary circuitry design radio frequency part short range communication system based nRF401. transceiver data control lines DIN, DOUT, TXEN, PWR_UP 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. 2.1. Differential connection loop antenna Figure shows schematics layout with differential connection loop antenna. layout shown Figure loop antenna layouts described chapter easily placed together with this layout. connection points numbered loop antenna layouts should connected exactly corresponding connection points numbered layout. loop antenna practical reasons connected further away from nRF401, connection symmetrical length tracks must exceed about 6cm. Since loop antenna tuned antenna, tuning antenna checked this case. Gerber files archive filename PCB_nRF401_diff.zip.
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nRF401 antenna layout
recommended external components given Table
Component
Description
ceramic chip capacitor, (Crystal oscillator) ceramic chip capacitor, (Crystal oscillator) ceramic chip capacitor, (PLL loop filter) ceramic chip capacitor, (PLL loop filter) ceramic chip capacitor, (Supply decoupling) ceramic chip capacitor, (Supply decoupling) ceramic chip capacitor, (Supply decoupling) ceramic chip capacitor, (Supply decoupling) ceramic chip capacitor, (Supply decoupling) inductor, Q>45 0.1W chip resistor, (Crystal oscillator) 0.1W chip resistor, (PLL loop filter) 0.1W chip resistor, (Transmitter power setting) Crystal
Size
0603 0603 0603 0603 1206 0603 0603 0603 0603 0603 0603 0603 0603
Value
221) 4.000
Tolerance
Units
Table Recommended External Components.
[1]. [1].
Single ended connection antenna using differential single ended matching network Figure shows schematics layout with single ended connection antenna using differential single ended matching network. layout shown Figure 2.2. antenna connection point should close possible output matching network. track between output matching network antenna connection point practical reasons exceed about 3cm, this track should carried microstrip line. standard printed circuit board with 1.54mm substrate thickness relative dielectric constant 4.45 433MHz, width microstrip line should 3mm. Gerber files archive filename PCB_nRF401_single_netw-1_1.zip. recommended external components given Table except supply decoupling capacitor with addition components differential single ended matching network given Table
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nRF401 antenna layout
Component
Description
ceramic chip capacitor, (Supply decoupling) ceramic chip capacitor ceramic chip capacitor ceramic chip capacitor, (Optional notch filter component3)) Chip inductor, SRF>433 MHz4) Chip inductor, Q>45 Chip inductor, Q>45 Chip inductor, (Optional notch filter component3))
Size
0603 0603 0603 0603 0603 0603 0603 0603
Value
Tolerance
<±0.25 <±0.1 ±10%
Units
Table Recommended components differential single ended matching network
additional notch filter input/output necessary dependent application requirements.
[1].
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nRF401 antenna layout
2.2uF 1206 22pF 0603 0603
4.000
22pF 0603
REFERENCE
FILT1 VCO1 VCO2 DOUT TXEN PWR_UP ANT1 ANT2 RF_PWR TXEN PWR_UP Loop antenna connection 100pF 0603 100pF 0603 aaaaaaaa
15nF 0603 820pF 0603 22nH 0603 4.7K 0603 100nF 0603 0603 DOUT
nRF401 433MHz Single chip Transceiver SSOIC20
0603
FILTER
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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nRF401 antenna layout
2.2uF 1206 22pF 0603 0603
4.000
22pF 0603 180nH 0603 18nH 0603 TXEN PWR_UP 1.8pF 0603 0603 18nH 18nH 0603 0603 in/out 470pF 0603 1.8pF 0603 aaaaaaaa
REFERENCE
FILT1 VCO1 VCO2 DOUT TXEN PWR_UP ANT1 ANT2 RF_PWR
15nF 0603 820pF 0603 22nH 0603 4.7K 0603 100nF 0603 0603 DOUT
nRF401 433MHz Single chip Transceiver SSOIC20
0603
100pF 0603
FILTER
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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nRF401 antenna layout
Loop antenna layouts
loop antenna with T-match good solution cost small size radio modules. Three different layout solutions small rectangular loop antennas described below. Figure shows geometry designed rectangular loop antennas.
Figure Geometry rectangular loop antenna loop antenna physical parameters loop antenna length [mm] loop antenna width [mm] feed length [mm] width loop conductor
Each antenna tuned resonance frequency 433MHz with chip capacitors designed loop antennas, these capacitors should have tolerances better then resistor controls Q-value antenna. loop antennas tuned approximately with T-match. width loop conductor loop antennas 1mm. There ground plane beneath antennas. Table shows summary designed loop antennas.
Loop antenna [mm]
18x10 25x15 35x20
Feed length [mm]
21.5 22.5
Value [pF]
Tolerance [pF]
±0.25 ±0.1 ±0.1
Value [pF]
Tolerance [pF]
±0.25 ±0.25 ±0.1
RQ5)
Q-value
Table Summary loop antennas
Thick film chip resistor with resistance tolerance better.
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nRF401 antenna layout
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 layouts 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 combinations antennas presented this application note made based theory given [2]. Initial communication range tests should carried with combination smallest antennas that, based estimations, satisfies range requirements. achieved communication range does satisfy requirements, both antennas communication link should exchanged with larger antenna. Table lists Gerber files archive filenames three antenna layouts.
Loop antenna a1xa2 [mm]
18x10 25x15 35x20
Gerber files archive filename
Loop_18x10mm_400ohm.zip Loop_25x15mm_400ohm.zip Loop_35x20mm_400ohm.zip
Table Gerber files archive filenames Measured loop antenna gain relative dipole antenna mounted 40x40cm ground plane shown Table
Loop antenna a1xa2 [mm]
18x10 25x15 35x20
Gain relative dipole antenna [dB]
Table Measured loop antenna gain relative dipole antenna mounted 40x40cm ground plane
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nRF401 antenna layout
References
Product Specification nRF401, "433MHz Single Chip Transceiver", Nordic VLSI ASA. Application note nAN400-03, "Small loop antennas", Nordic VLSI ASA.
LIABILITY DISCLAIMER
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.
LIFE SUPPORT APPLICATIONS
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: 15.05.2000. Application Note order code: 150500-nAN400-05 rights reserved Reproduction whole part prohibited without prior written permission copyright holder.
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nRF401 antenna layout
YOUR NOTES
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nRF401 antenna layout
Nordic VLSI World Wide Distributors
Your nearest dealer, please http://www.nvlsi.no
Main Office: Vestre Rosten N-7075 Tiller, Norway Phone: Fax: E-mail: nRF@nvlsi.no Visit Nordic VLSI website http://www.nvlsi.no
Revision:
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nAN400-05 Gerber files layouts have been made Nordic VLSI's nRF40

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