nAN400-04 Gerber files layouts have been made Nordic VLSI's nRF04
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nRF0433 antenna layout
nAN400-04
Gerber files layouts have been made Nordic VLSI's nRF0433 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 nRF0433
layouts include necessary circuitry design radio frequency part short range communication system based nRF0433. transceiver data control lines DIN, DOUT TXEN 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 nRF0433, connection symmetrical length tracks must exceed about 6cm. Since loop antenna tuned antenna, tuning antenna checked this case. Gerber files archive filename PCB_nRF0433_diff.zip.
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nRF0433 antenna layout
recommended external components given Table
Component
Description
ceramic chip capacitor, (PLL loop filter) ceramic chip capacitor, (PLL loop filter) ceramic chip capacitor, (Crystal oscillator) ceramic chip capacitor, (Crystal oscillator) 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 1/8W chip resistor, (PLL loop filter) 1/8W chip resistor, (Crystal oscillator) 1/8W chip resistor, (Transmitter power setting) Crystal
Size
0603 0603 0603 0603 1206 0603 0603 0603 0603 0805 0603 1206 0603
Value
4.000
Tolerance
Units
Table Recommended External Components.
[1]. [1].
2.2. Single ended connection antenna using balun Figure shows schematics layout with single ended connection antenna using impedance transformer balun. layout shown Figure antenna connection point should close possible output balun. track between output balun 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_nRF0433_single_trafo.zip. recommended external components given Table with addition components differential single ended balun network given Table
Component
Description
Chip inductor impedance ratio transformer (e.g. Mini-Circuits TC8-1)
Size
0603
Value
Tolerance
Units
Table Recommended components differential single ended balun network
Nordic VLSI Revision:
Vestre Rosten N-7075 Tiller, Norway Page
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February 2000
nRF0433 antenna layout
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 2.3. layout chapter 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 described chapter 2.2. Gerber files archive filename PCB_nRF0433_single_netw.zip. recommended external components given Table with addition components differential single ended matching network given Table
Component
Description
ceramic chip capacitor ceramic chip capacitor ceramic chip capacitor Chip inductor Chip inductor
Size
0603 0603 0603 0603 0603
Value
Tolerance
<±0.25 <±0.25 <±0.25 ±10%
Units
Table Recommended components differential single ended matching network
Nordic VLSI Revision:
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nRF0433 antenna layout
8.2M 2.2uF 1206 22pF 0603 1206
4.000
22pF 0603
0603
FILT2 FILT1 VCO1 VCO2 DOUT TXEN ANT1 ANT2 RF_PWR 100pF 0603 Loop antenna connection 100pF eeee 0603
5.6nF 0603 270pF 0603 22nH 0805 0603 100pF 0603 100pF 0603
nRF0433 Single chip 433MHz Transceiver SOIC-20
FILTER
TXEN DOUT
Figure Schematics layout with differential connection loop antenna
silk screen
Bottom silk screen
view
Bottom view
Figure layout with differential connection loop antenna (actual size 23x26mm)
Nordic VLSI Revision:
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nRF0433 antenna layout
8.2M 2.2uF 1206 22pF 0603 1206 100pF 0603 22pF 0603 0603
4.000
FILT2 FILT1 VCO1 VCO2 DOUT TXEN ANT1 ANT2 RF_PWR 100pF 0603 82nH 0603 in/out eeee
5.6nF 0603 270pF 0603 22nH 0805 0603 100pF 0603 100pF 0603
nRF0433 Single chip 433MHz Transceiver SOIC-20
FILTER
TXEN DOUT
Figure Schematics layout with single ended connection antenna using impedance transformer balun
silk screen
Bottom silk screen
view
Bottom view
Figure layout with single ended connection antenna using impedance transformer balun (actual size 28x26mm)
Nordic VLSI Revision: Vestre Rosten N-7075 Tiller, Norway Page Phone February 2000
nRF0433 antenna layout
8.2M 2.2uF 1206 22pF 0603 1206 100pF 0603 22pF 0603 0603 100nH 0603 FILT2 FILT1 VCO1 VCO2 DOUT TXEN ANT1 ANT2 RF_PWR 100pF 0603 5.6pF 0603 in/out 22nH 0603 eeee
4.000
5.6nF 0603 270pF 0603 22nH 0805 0603 100pF 0603 100pF 0603
2.2pF 0603
nRF0433 Single chip 433MHz Transceiver SOIC-20
5.6pF 0603
FILTER
TXEN DOUT
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 (actual size 25x26mm)
Nordic VLSI Revision: Vestre Rosten N-7075 Tiller, Norway Page Phone February 2000
nRF0433 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 434MHz 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
RQ3)
Q-value
Table Summary loop antennas
Thick film chip resistor with resistance tolerance better.
Nordic VLSI Revision:
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nRF0433 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
Nordic VLSI Revision: Vestre Rosten N-7075 Tiller, Norway Page Phone February 2000
nRF0433 antenna layout
References
Product Specification nRF0433, "Single Chip 433MHz Transceiver", Nordic VLSI ASA. Application note nAN400-03, "Small loop antennas", Nordic VLSI ASA.
Nordic VLSI Revision:
Vestre Rosten N-7075 Tiller, Norway Page
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nRF0433 antenna layout
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 22.02.2000. Application Note order code 220200-nAN400-04 rights reserved Reproduction whole part prohibited without prior written permission copyright holder.
Nordic VLSI Revision:
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nRF0433 antenna layout
YOUR NOTES
Nordic VLSI Revision:
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nRF0433 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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February 2000
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