ANTENNAS AND FLEXIBLE RF - Fraunhofer · 2020-07-08 · Antennas and Flexible RF | Rainer Wansch | Fraunhofer Turkish - German Days | 25.09.2014 | HFS | Seite 16 Antenna Testing at

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ANTENNAS AND FLEXIBLE RF

© Fraunhofer IISAntennas and Flexible RF | Rainer Wansch | Fraunhofer Turkish - German Days | 25.09.2014 | HFS | Seite 2

Antennas and Flexible RFOutline

Antenna design

Antenna testing

Reconfigurable RF-Technologies


Antennas at Fraunhofer IISAt a Glance

Development of:

Multi-antenna systems

Embedded antennas

Reference antennas

Navigation antennas

3D EM Simulations:

FDTD

FEM

Implementations

Antenna measurements


Antennas at Fraunhofer IISApplications (Examples)

Satellite Navigation (GNSS)

SatCom and Broadcast

Direction of Arrival Estimation

Communication


Antennas at Fraunhofer IISVehicular Applications

Design and implementation of referenceantennas for satellite broadcasting(L-, S-Band)

Concepts for usage of distributedantennas on vehicles

Antenna technologies (radiator)

Integration of antenna andreceive/transmit electronics


Antennas at Fraunhofer IISDVB-SH Reference Antenna

Measurement results on Ø 1m ground plane

Integrated LNA (G = 30 dB, NF < 1 dB)

Antenna gain:

RHCP, dBic: 0...5

VP, dBil: - 6...+1

Size: Ø 141mm, H 25mm

@2.185 GHz


Antennas at Fraunhofer IISActive GNSS Antenna

High precision navigation usingmulit-band antenna

Antenna for Galileo, GPS, Glonass and Compass

Very high phase center stabilityover complete frequency range

Applications in e. g. farming, road construction, geodetics

Licensed to navXperience as„3G+C“


Antenna Arrays & Smart Antennas

Array antennas for:

DoA estimation

High-gain applications

Broadband fixed beam

Analysis of antenna‘s impact on:

Diversity performance

DoA estimation accuracy

Calibration of antennas based on self-analysis

Beamforming using heuristic methods


Antenna-ArraysTracking of Mobile-Base-Stations

EU FP7 Project “EATS”: ETCS Advanced Testing and Smart Train Positioning System

European Consortium

Task: Position determination using DoA-estimation ofGSM-R/UMTS-Base-stations

Antenna development considering:

Distribution of base stations

Channel characteristics (multi-path, scattering, diffraction,…)

Influence of train roof


Antenna-ArraysDoA Estimation at 5.8 GHz

Application:

Cooperative localisation of pedestrians in road traffic in 5.8 - GHz Band using DoAestimation

Frequency range:

5.725 … 5.925 GHz

Diameter: 120 mm

RHCP

Excellent phase behaviour byimplementing symmetricalantenna layout

top side

bottom side


Antenna-ArraysBroadband L-Band-Array for Space Segment

Application:

Radio Occultation

RHCP polarised

Frequency range:

1156.45 ...1577.42 MHz

Size:

130 mm × 760 mm × 25 mm

Gain: 7 dBic


Antenna-ArraysMultibeam Antenna for RFID Applications

Quasi simultaneous reading of high amounts of transponders

High reading rate with a low number of antennas

Very high level of miniaturization

Applications:

Logistics and tradee. g. manufacturing processes, transportation, customs controls


Antenna-ArraysMiniTerminal

6 x 16 patch antenna array with parallel feeding network

Frequency range: 10,7 – 12,75 GHz

Polarisation: linear vertical and horizontal

HPBW: 4° x 10° (Az x El)

G/T > 0 dB/K

Output frequency range: 950 – 2150 MHz

Aperture size < 400 cm²

-40

-35

-30

-25

-20

-15

-10

-5

0

-30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30

Far-field amplitude of NF_OEWG90_MiniTV5_0_PortB_01.nsi

Am

plitu

de (dB

)

Azimuth (deg)

Co-Pol X-Pol

Azimuth diagram


14Antenna ArraysSlotted Waveguide Antenna for Ka-Band (Circularly polarised)

Combination of linear, dielectrically filled sub-groups

Beam adjustment in one direction


Antenna Testing at Fraunhofer IISAntenna Measurements – Indoor Test Range in Erlangen

Measurement of antenna gain andradiation pattern

Noise measurement of low gain antennasindoor

Test range:

0.5 ... 40 GHz

Far-field measurement(distance 7.5 m)

Spherical near-field measurements


Antenna Testing at Fraunhofer IISAntenna Measurements - Facility for Over-the-air Research and Testing (FORTE) located in Ilmenau

Test of satellite terminals and theirtracking performances of satelliteterminals by emulation

Test of mechanical movement

Test of satellite link at different environmental conditions (movement, shadowing, weather) at Ku-/Ka-Band


Flexible RFFuture Hardware Requirements

To cover wide frequency range

Reconfigurable components

Broadband components

To avoid interferences

Receiver branch of high sensitivity and high dynamic for spectrum sensing

Short hardware-configuring response times

Low out-of-band leakage

To allow co-existence with services

Power level adjustment

Spatial and/or polarisationdiversity antennas

To ensure mobility

Small and energy efficient components


Flexible RF Applications

Cognitive Radio / Software-Defined Radio

Communication in spectral„White Spaces“

Opportunistic use of free resources

Multiband & multifrequency

Antenna-Arrays

„Beam forming“

„Beam switching“

Tracking

Signal

Ausleuchtung

Keulenformungsnetzwerk

1 2 3 4


Flexible RFOverview

Design and Implementation of tunable RF components:

Filters

Matching networks

Phase shifters

Reconfigurable transceivers


Flexible RFExample Broadband-Tuneable Receiver

Experimental platform

68 mm × 75 mm

Input dynamic:

-90 dBm … -3 dBm

Frequency tuning range:

470 MHz … 860 MHz

Signal bandwidth:

40 MHz max.

supported by EC FP7 under Grant 248454 (QoSMOS)


Flexible RFTunable Bandpass

2 coupled resonators

Tunable using varactors

Only one tuning voltage needed

Tuning range:

430 ... 984 MHz

0.0 0.5 1.0 1.5 2.0 2.5 3.060

50

40

30

20

10

0

Frequency in GHz

Forw

ard

tran

smis

sion

|s21

|in

dB

Measurement

Ur = 0 V ... 8 V

Varactor Band-passsect ion Low-pass sect ion

UrUr


Flexible RFDigitally Tunable Bandpass

Digitally tunable resonators using switchable capacities

Serial interface for control

PnP-Module:

Dimensions: 40 mm x 15 mm

„drop-in“-Module:

Dimensions: 20 mm x 20 mm


Flexible RFMulti-Channel Switching

Experimental platform

310 mm × 100 mm

Input dynamic:

−87 dBm... − 18 dBm w/o LNA

4 RF channels

TVWS700 MHz ... 792 MHz

LTE790 MHz ... 862 MHz

WLAN 2400 MHz ... 2483.5 MHz

LTE2500 MHz ... 2700 MHz

IF 250 MHz

Switchable IF bandwidth

83 MHz max.

supported by EC FP7, Grant 249060 (SACRA)


Summary

Documents

ANTENNAS AND FLEXIBLE RF - Fraunhofer · 2020-07-08 · Antennas and Flexible RF | Rainer Wansch | Fraunhofer Turkish - German Days | 25.09.2014 | HFS | Seite 16 Antenna Testing at