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EMMY-W1 Antenna reference design
Topic :
Doc.No: UBX-16015910
Revision R02
Date: Name Signature
Created 01-Jul-2016 Stefano Bianconi sbia
Checked
Released 23-Sep-2016 Daniel Dietterle ddie
We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden. © 2016 u-blox AG
EMMY-W1 Antenna reference design
1 Scope
This document defines the essential specifications necessary to implement the EMMY-W1 antenna reference
designs. The information contained herein and its references should be sufficient to guide a skilled person in an
attempt to implement the design on a host carrier. It will provide the designer with PCB layout details and
expected performance specifications.
The document supports the four different PCB designs for Wi-Fi:
• Two connector-based designs for the use of external antennas (one for each antenna pin of the module)
• Two designs based on SMD antennas (one for each antenna pin of the module)
This document also supports general guidelines for the design of the NFC interface.
2 FCC/IC ID reference
Model FCC ID IC ID
EMMY-W161
EMMY-W163
EMMY-W165
Table 1: FCC and IC IDs for different models of EMMY-W1 series
XPYEMMYW161 8595A-EMMYW161
XPYEMMYW163 8595A-EMMYW163
XPYEMMYW165 8595A-EMMYW165
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3 General description
When using the EMMY-W1 together with this antenna reference design, the circuit trace layout must be made
in strict compliance with the instructions below.
All the components placed on each RF trace must be kept as indicated in the reference design, even if not used.
The PCB areas of unused reference designs must be flooded with ground.
1
2
Figure 1: Antenna Reference design embedded in a host carrier PCB
Reference Description
1 Host carrier PCB (light green)
2 Antenna reference design (dark green)
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3.1 Floor plan and PCB stack-up
This section describes where the critical components are positioned on the reference design. It also presents the
stack-up of the four layers of the PCB.
10
3
4
5
6
7
8
9
Figure 2: EMMY-W1 antenna reference design
Reference Description
3 SMD antenna
4 Antenna impedance matching network
5 Connectors for external antenna
6 Antenna coplanar microstrip, matched to 50 Ω
7 Top layer GND-plane
8 Antenna impedance matching network
9 SMD antenna
10 ELLA-W1 module
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3.2 PCB stack-up
The stack-up used in the reference design is specified in Table 2.
PCB Layer Material Thickness
Soldermask Top Generic LPI Soldermask 25 µm
Top Copper Foil 35 µm
Dielectric Pre-preg 2x7628 360 µm
L2 Copper Foil 35 µm
Dielectric Core 700 µm +/-10%
L3 Copper Foil 35 µm
Dielectric Pre-preg 2x7628 360 µm
Bottom Copper Foil 35 µm
Soldermask Bottom Generic LPI Soldermask 25 µm
Table 2: Stack-up of EVK-EMMY-W1
3.2.1 RF trace specification
The 50 Ω coplanar micro-strip dimensions used in these reference designs are stated in Figure 3 and Table 3.
Figure 3: Coplanar micro-strip dimension specification
Item Value
S 400 µm
W 600 µm
T 35 µm
H 360 µm
Table 3: Coplanar micro-strip specification
3.3 Mechanical dimensions
The Mechanical dimensions and position of the components are specified in Figure 4.
The layers beneath the ‘top layer’ have the same dimensions and are filled with ground. No RF traces are routed
in those layers.
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Figure 4: Mechanical dimensions of EVK-EMMY-W1, top layer
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4 Reference designs for antenna pin 1
This section describes the available designs for the antenna pin 1 of the EMMY-W1 modules.
Figure 5: Reference schematic for antenna pin 1
4.1 Internal antenna
The reference design with internal antenna uses the SMD Antenova type A10194 dual band antenna that is
connected to the module RF-port via a coplanar micro-strip transmission line.
4.1.1 Bill of materials
Reference
designator
A1 Antenna CHIP 2.45 & 5 GHz Antenova A10194
L1 IND, Multilayer Ceramic, 10nH, +/-5%, 300mA, SMD 0402 Johanson Technology L-07C10NJV6ST
L2 IND, Multilayer Ceramic, 1nH, +/-0.3nH, 300mA, SMD 0402 Johanson Technology L-07C1N0SV6T
C2 CAP, CER, 0.2pF, +/-0.1pF, C0G, 50V, SMD 0402 Johanson Technology 500R07S0R2BV4
R1
R2 Do not Assembly - -
J7 Do Not Assembly - -
4.1.2 Antenna characteristics
Parameter Low band High band Unit
Frequency Range 2.4 – 2.5 4.9 – 5.875 GHz
Peak Gain 1.8 4.1 dBi
VSWR < 1.4:1 < 1.8:1 -
Efficiency >75 >60 %
Polarisation Linear -
Radiation pattern Omnidirectional -
Temperature range -40 to +85 °C
Impedance 50
Dimension
(L x W x H)
Description Manufacturer P/N
0 Ω resistor, 0402
10.0 x 10.0 x 0.9 mm
Generic -
Ω
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4.2 External antenna
The reference design with external antenna uses the micro coaxial connector that is connected to the external
antenna via a 50 Ω pigtail. See section 6 for a list of available external antennas.
4.2.1 Bill of materials
Reference
designator
A1 Do Not Assembly - -
L1 Do Not Assembly - -
L2 Do Not Assembly - -
C2 Do Not Assembly - -
R1 Do Not Assembly - -
R2 0 Ω resistor, 0402 Generic -
J7 Coaxial Connector, 0 – 6 GHz, SMD
Description Manufacturer P/N
Hirose
U.FL-R-SMT-1(10)
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5 Reference designs for antenna pin 2
This section describes the available designs for the antenna pin 2 of the EMMY-W1 modules.
Figure 6: Reference schematic for antenna pin 2
5.1 Internal antenna
The reference design with internal antenna uses the SMD Johanson Technology type 2450AT45A100 antenna
that is connected to the module RF-port via a coplanar micro-strip transmission line.
5.1.1 Bill of materials
Reference
designator
A2 Antenna CHIP 2.4-2.5GHz Johanson Technology 2450AT45A100
C3 CAP, CER, 2.2pF, +/-0.1pF, C0G, 50V, SMD 0402 Johanson Technology 500R07S2R2BV4
C4 CAP, CER, 1.8pF, +/-0.1pF, C0G, 50V, SMD 0402 Johanson Technology 500R07S1R8BV4
L3 IND, Multilayer Ceramic, 3.9nH, +/-0.3nH, 300mA, SMD 0402 Johanson Technology L-07C3N9SV6T
R9 0 Ω resistor, 0402 Generic -
R10 Do not Assembly - -
J8 Do Not Assembly - -
5.1.2 Antenna characteristics
Parameter Low band Unit
Frequency Range 2.4 – 2.5 GHz
Peak Gain 2.2 dBi
VSWR < 2:1 -
Polarisation Linear -
Radiation pattern Omnidirectional -
Temperature range -40 to +125 °C
Impedance 50
Dimension
(L x W x H)
Description Manufacturer P/N
Ω
9.5 x 2.0 x 1.2 mm
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5.2 External antenna
The reference design with external antenna uses the micro coaxial connector that is connected to the external
antenna via a 50 Ω pigtail. See section 6 for a list of available external antennas.
5.2.1 Bill of materials
Reference
designator
A2 Do not Assembly - -
C3 Do Not Assembly - -
C4 Do not Assembly - -
L3 Do not Assembly - -
R9 Do Not Assembly - -
R10 0 Ω resistor, 0402 Generic -
J8 Coaxial Connector, 0 – 6 GHz, SMD
Description Manufacturer P/N
Hirose
U.FL-R-SMT-1(10)
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6 Approved external antenna list
For Bluetooth operation on EMMY-W163, the module has been tested and approved for use with antennas
listed in Table 4.
Model name Manufacturer and description Gain [dBi] (peak)
ANT-2.4-CW-RCT-RP Linx, Single-band dipole antenna
ANT-2.4-CW-RH Linx, Single-band monopole antenna -0.9
GW.26.0151 Taoglas, Single-band dipole antenna 1.8
Table 4: Approved antennas list, single-band operation
2.2
For Bluetooth and Wi-Fi operations in the 2.4 GHz band and Wi-Fi operation in the 5 GHz band, the module has
been tested and approved for use with antennas listed in Table 5.
Model name Manufacturer and description Gain [dBi] (peak)
ANT-DB1-RAF-RPS Linx, Dual-band dipole antenna
GW.40.2153 Taoglas, Dual-band dipole antenna
GW.59.3153 Taoglas, Dual-band dipole antenna
RFDPA870900SBLB8G1 Walsin, Dual-band dipole antenna
88395 Delock, Dual-band dipole antenna
Table 5: Approved antennas list, dual-band operation
2.5 @ 2.4GHz band
4.6 @ 5GHz band
3.74 @ 2.4GHz band
2.5 @ 5GHz band
2.37 @ 2.4GHz band
2.93 @ 5GHz band
2 @ 2.4GHz band
3 @ 5GHz band
1.5 @ 2.4GHz band
2.1 @ 5GHz band
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7 NFC reference design
This section describes the available design for the NFC coil antenna of the EMMY-W1 modules.
Figure 7: Reference schematic for NFC coil antenna
7.1 Internal antenna
The reference design uses a NFC coil antenna designed by u-blox.
7.1.1 Bill of materials
Reference
designator
J6 Pin Header, Pitch 2.54mm, 1x4 Way, Through Hole Samtec TSW-104-07-G-S
C10 Do Not Place - -
C11 CAP, CER, 220pF, 5%, NP0, 50V, SMD 0402 Murata GRM1555C1H221JA01
C12 CAP, CER, 820pF, 5%, NP0, 50V, SMD 0402 Murata GRM1555C1H821JA01
C13 Do Not Place - -
C14 CAP, CER, 820pF, 5%, NP0, 50V, SMD 0402 Murata GRM1555C1H821JA01
C15 Do Not Place - -
7.1.2 NFC coil characteristics
Parameter Low band Unit
Frequency Range 13.56 MHz
Number of turns 4 -
Trace width 0.4 mm
Trace spacing (edge to edge) 0.4 mm
Dimensions (L x W) 30 x 30 mm
Description Manufacturer P/N
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Figure 8: EMMY-W1 reference coil antenna, mechanical dimensions
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