Ultra-compact OTA test environment
with antenna coupler
for 5G FR2 mmW & Wi-Fi 6 60GHz
Morita-Tech
5th.Aug.2020
１．THE DIFFRENCE BETWEEN THE TESTS OF ４Ｇ AND 5G
The test of mobile
Communication device
since 4G
４G Terminal
The test of mobile
Communication device
begin on 5G
5G Terminal
Antenna
Connect
Measurement
method
４G
Tester
Electromagnetic
wave
5G
Tester
The connect for RF testing is available. Without the RF texting connect .
The device communicates with the tester by waves
Connecting with the tester to start
to start testing.
measuring.
Advantage
The measuring errors are few.
The measuring repeatability is
excellent.
The measuring errors are dependent on the
environment.
The measuring repeatability is not good enough.
2
１-2． THE WORLD STANDARD OF OTA TEST
Several recommended methods of 5G device measurement are advised by
the international standard—3GPP.
In the 5G measurement, almost all the companies are advised to measure in
far-field by using a horn antenna.
The weakness of the measurement in far-field is that the distance between
the terminal and the tester is over meters, the large equipment has to be constructed.
Mounting Example１
Linear type
Mounting Example ２ Reflection type
（main）
meters
5G
Terminal
Horn antenna
Mechanism
of rotation
Mechanism of
rotation
5G
Tester
SIZE
H: About 1m
W: About ２m～2．5m
D: About 1m
About 1 meter
5G
Terminal
5G
Tester
SIZE
Reflector
Horn antenna
H: About 1m
W: About 1.5m～2m
D: About 1m
3GPP :Third Generation Partnership Project
The organization that work out the standard of The 3th generation mobile specifications with countries and manufactures. The standard of the 5th generation mobile
communication is under drafting.
3
１-3． THE OTA TEST TASKS
TASK:1
The changes are increasing by the
influence of the distance and space.
5G Terminal
TASK:２
The measurement changing
with the changes of distance
and conditions between the
Antenna, becasue the 5G
device’s rotation.
meters
Horn antenna
Mechanism
of rotation
5G
Tester
solutions！
The antenna can measure nearby.
TASK:４
Can we only use the expensive
instrument in production lines?
solutions ！
Use a compact electric power tester.
TASK:３
solutions ！
Measuring by several fixed antennas
When thousands terminals are
manufactured in the future, can we equip a
large device in production lines?
solutions ！
Desksize shield box
All THE TASKS CAN BE SOLVED BY USING
THE ANTENNA COUPLER.
4
２-1．WHAT IS ANTENNA COUPLER?
◇Antenna coupler？
The coupling antennas are used in measurement.
◇The difference with the antenna ?
Have a advantage of high frequency bands.(MHzs~GHzs)
but the VSWR will be increasing.
◇The key superiority of MORITA TECH？
Close contact with the measurement object is available.
The influence to the electromagnetic wave is reducing with
the changing of the space.
Antenna coupler
Commercialization NO.1
FA-290
5
２-2．THE TECHNOLOGY SUPERIORITY OF ANTENNA
①EVM（rms）within 1% is available.
（when antenna couplers are coupling.）
②The polarization is fine by the flat coupling loss characteristic. The errors are
within 5dB in within-band(6GHz).
（ when antenna couplers are coupling. ）
③When the antenna coupler during total reflection, although the VSWR will be
worsened, the huge changes of phase will not be happened with a moderate
characteristics.
Close contact with the measurement object
Compared with the other companies that using horn antenna,
here is 3 advantages:
High Accuracy, space saving, repeatability
6
２-3． THE TECHNOLOGY SUPERIORITY
①EVM（rms）within 1% is available. （ when antenna couplers are coupling.）
EVM(Error Vector Magnitude) means the accuracy of the digital transmit.
When EVM is worsening, the symbol point in the picture will be in chaos （polarization and phase）、 In
the worst-case, the communication will be unavailable.
Because the 5G have high frequency
band and more symbol points, where the
huge changes of polarization and phase
occurs, the places of the symbol points will
be disturbed and the EVM will be
worsening.
symbol
EVM under１％
The antenna coupler of MORITA TECH, not
only can keep the transmit accuracy , but
also can realize a high quality
communication between the object to be
measured.
7
２-3． THE TECHNOLOGY SUPERIORITY
② The polarization is fine by the flat coupling loss characteristic. The errors are
within 5dB in within-band.
（ when antenna couplers are coupling. ）
The passing by antenna couplers make the coupling characteristic flat in order to
realize the EVM within 1%. Although passing by antenna couplers, but the coupling
Characteristic is as good as coupling by cables.
◆Coupling characteristic（coupling between antenna）
◆Coupling condition
coupling
characteristic
23GH
z
26GH
z
29GH
z
Product specification within-band
fluctuation within about 5dB
8
２-3． THE TECHNOLOGY SUPERIORITY
③When the antenna coupler during total reflection, although the VSWR
will be worsened, the huge changes of phase will not be happened
with a moderate characteristics.
The antenna coupler is designed to be able to measure objects nearby and closely contact,
and absorbe the huge changes of the phase at the total reflection.
By covering the obverse side of the antenna coupler with metal plate, even during the total
reflection, the phase and the reflection attenuation is stable. So, by contacting couplers with
smart phone closely and flatting the coupling characteristics, the EVM value will be
improved.
◆Reflection attenuation characteristics during total reflection（t=5mm Aluminum ）
waveform on horn antenna and designed coupler
0dB
-5dB
23GHz
26GHz
29GHz
FA-290、FA-291 waveform
0dB
23GHz
26GHz
29GHz
-5dB
A gentle wave form that absorbs turbulence during
near-field total reflection
9
２-4． Antenna Couplers
③When the antenna coupler during total reflection, although the VSWR
will be worsened, the huge changes of phase will not be happened
with a moderate characteristics.
The antenna coupler is designed to be able to measure objects nearby and closely contact,
and absorbe the huge changes of the phase at the total reflection.
By covering the obverse side of the antenna coupler with metal plate, even during the total
reflection, the phase and the reflection attenuation is stable. So, by contacting couplers with
smart phone closely and flatting the coupling characteristics, the EVM value will be
improved.
◆Reflection attenuation characteristics during total reflection（t=5mm Aluminum ）
waveform on horn antenna and designed coupler
0dB
-5dB
23GHz
26GHz
29GHz
FA-290、FA-291 waveform
0dB
23GHz
26GHz
29GHz
-5dB
A gentle wave form that absorbs turbulence during
near-field total reflection
10
２-4． Antenna Couplers
• Lineup Sub 6GHz ~ 28GHz band ~ 40GHz band
And Brand New 60GHz band !
• Linear polarization, circular polarization, vertical/horizontal, multi (4ch), large to small
A
N
T
E
N
N
A
C
O
U
P
L
E
R
SUB6GHz
24GHz - 29GHz
600MHz - 6GHz
FA-291
FA-290
FA-600
Linear polarization coupler
56 - 67GHz
FA-520C
Small size Linear polarization Circular polarization couple
couple
Linear polarization coupler
FA-862S
SUB 6 GHz / 28 GHz B
and V / H Compatible
FA-729Ｓ
FA-529S
Ultra-small linear
polarization
coupler
FA-600N
FA-629S
Supports vertical and
For both vertical and
horizontal polarization Quad horizontal polarization
linear polarization coupler
Linear polarization
coupler
New
FA-596S
Linear polarization coupler with NFC
compatible
24GHｚ - 43.5GHz対応
FA-706S
Supports vertical and horizontal
polarization Quad linear polarization
coupler
FA-430
FA-431
Linear polarization coupler
Linear polarization
coupler
FA-543S
FA-643S
Linear polarization
coupler
For both vertical and horizontal polarization
Linear polarization couple
11
２-4-1． [NEW] Antenna Coupler FA-596S
60GHz-band antenna couplers for 5G,Wi-Fi 6, etc. 60GHz OTA test
◆Specifications.
Model number
Frequency
V.S.W.R
Maximum power
Connector
Polarization
Size
:
:
:
:
:
:
:
FA-596S
56GHz - 67GHz
2.5
1W
1.85mm
Linera polarization
16(H) x 26(W) x 43(W) mm
12
３-1．THE MEASUREMENT BY MORITA TECH’S SOLUTION
The following items are necessary on the 5G Measurement.
The measurement items on development/prototype/ production
・Power（peak ，Adjacent leakage ）
・ Spurious
・ EVM Test
・ Beam Forming
・ MIMO
・ Handover
・ protocol
Measurement items in the operating filed
・ Investigation of the base station’s operate condition
13
３-2． Shield box FS-1905
The reference examples of using compact shield box 「FS-1905」for 5G
measurement are shown in the following measurement items.
FS-1905 Appearance
FS-1905 Internal view
FS-1905 Cross section
14
３-3．FS-1905 Specifications
15
３-4-1．Measurement examples
・ Power（peak ，Adjacent leakage ）
Power・Spurious・EVM
For example, the waves are emitted to the antenna coupler
marked by the red circle.
・ Spurious
・ EVM Test
The antenna couplers are placed around
the terminal where the antennas are
installed, the antenna couplers receive the
radio waves emitted from the terminals to
measure 3 items.
At that time, the beam emitted from the
terminal’s antenna will export in a specific
direction.
Spurious is that ,equipping antenna couplers
depends on the measuring frequency band.
16
3-4-2．Measurement examples
・ Beam Forming
Beam Forming
For example, the waves are emitted to the antenna coupler
marked by the red circle.
The beam emitted from the antenna
installed in the terminal to antenna
couplers and received by all the antenna
couplers, measuring that the level of the
intended coupler is higher than others.
Where the terminal antenna placed
17
3-4-2．Measurement examples
Beam Forming
Reference: Freq=30GHz(λ=1cm), antenna D=16mm ・・・ R>51.2mm
A Study on Distance between DUT Antenna for Antenna Coupler in Beamforming Test
D=16mm, λ=10mm (30GHz)
𝑅=
2𝐷2
=51.2mm
𝜆
18
3-4-3． Measurement examples
MIMO
For example ,MIMO is arranged by couplers placed
In the red circle
・ MIMO
Combining antenna coupler with V and H
Polarization for measuring the MIMO Test.
By combining with several couplers, can
measure 4*4MIMO Test.
Easy switching between H/V polarization ,
equipped with a mechanism that rotates at
right angles.
Horizontal polarization
Vertical polarization
Where the terminal antenna placed
19
3-4-4．Measurement examples
Handover
For example ,Realizing by couplers in the red circle
・ Handover
By using several couplers, emitting radio
waves with difference ID to the antenna
couplers, the waves as same as the base
stations’. Measuring in a controlled level.
example scenario
base station A strong
base station B weak
base station A strong → weak
base station B weak → strong
Terminal
communicates with
base station A
Terminal communicates
with base station A
switches to base station
B
base station A
base station B
Where the terminal antenna placed
20
3-4-5．Measurement examples
・ Protocol
Protocol
For example ,Realizing by couplers in the red circle
Using one antenna coupler, send the
prescribed protocol to terminals.
Measuring(test) that are the responses,
operations and conditions on the
prescribed condition.
Where the terminal antenna placed
21
3-4-6． Measurement examples
Investigation of the base station’s operate condition
・ Investigation of the base station’s
operate condition
Combining antenna coupler with
communication analyzer for 5G,operating
base stations in field, otherwise, turn the
coupler towards the terminals, analyzing
the communication condition by contact.
Air interface test (BS)
Indoor/Outdoor
Cell ID, beam ID, beam power, beam SNR
22
４. THE SUPERIORITY OF ANTENNA COUPLER MEASUREMENT
THE SOLUTIONS OF MASS PRODUCTION PROBLEM
COMPONENT
ADVANTAGE
Measuring nearby, close contact
Antenna coupler
・ the excellent repeatability
※patent pending
Antenna coupler equipped
The compact shield box
・ space saving
・ the excellent repeatability
※ patent pending
Compared with golden machine
Judgment by Power sensor
・ Low price
・ Power linear fast judgment
Combine the advantages
Settled in 5G mass production line compactly
The 5G solutions of MORITA TECH
23
Thank you
Do you have any question?
MORITA TECH CO.,LTD.
Makoto Yamada
iNARTE ENGINEER EMC-003612-NE
Tel: +81-42-401-6330
Fax: +81-42-401-6331
mailto:yamada@morita-tech.co.jp
http://www.morita-tech.co.jp/
Tokyo JAPAN
© MORITA TECH CO.,LTD