EOLT Systems

Multifunction Antennas

Multifunction antennas must operate reliably across many frequency bands despite interference.

To ensure that every antenna meets the required signal quality and functionality, the end-of-line tester (EOLT) checks the RF performance and relevant diagnostic functions with cycle times as short as approximately 30 seconds. In addition, a mechanical test ensures that the contacts, assembly, and workmanship consistently meet the specifications. Sensors check the connector and verify that the test item is properly mounted.
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Challenges and Concept

Multifunction antennas in modern motor vehicles combine numerous communication and reception technologies into a single assembly. Consequently, the requirements for precise and reproducible end-of-line testing across different frequency ranges and signal types are correspondingly high.

eolt-multifunktionsantennen_grafik-testing

Blinker, Kamera, Heizung und Assistenzsysteme.

EOLT Systems

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Multifunction Antennas

Automated End-of-Line Testing System for Multifunction Antennas

For this purpose, MCD Elektronik developed an automated end-of-line test system that combines electrical, RF and mechanical testing in one continuous test sequence. A specially developed helical antenna for signal stimulation, product-specific adaptation and pneumatically controlled RF contacting enable reliable testing across the entire relevant frequency range.

MCD test software, together with the integrated control and data technology, handles the automated execution, evaluation and documentation of all tests, ensuring complete traceability.

Frequency range
87.5 kHz to 2.7 GHz
Types of Signals
Radio, GNSS, Satellite & Mobile Communications
Testing Process
Fully automated
Test and Functional Scope

The end-of-line test system verifies the relevant electrical, RF and mechanical functions of the multifunction antenna:

Connecting the Multifunction Antenna
Close-up view of the contacts
Test Probes and Test Adapters
Multifunction Antenna with Signal Transmission
Visualization of Antenna Signals
Display of Various Radio Signals
Multifunction antenna in the test fixture
Detailed view of the test station
Mechanical Mounting and Contacting

The antenna’s electrical parameters are automatically recorded and evaluated.

  • Current measurement
  • Voltage measurement
  • Diagnostic functions

Signal transmission is tested across the entire relevant frequency range from 87.5 kHz to 2.7 GHz.

  • AM
  • FM
  • DAB II
  • GPS
  • GLONASS
  • SDARS
  • TV
  • LTE
  • Mobile Communications
  • CB Radio
  • Protected Signals

The antenna’s mechanical properties and functions are tested using sensors.

  • Mechanical testing with sensors
  • Automatic detection functions
  • Automatic switching functions
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Complete functional test

Electrical, high-frequency, and mechanical functions are combined and documented as part of an automated test sequence.

Test Methods and Results

To ensure product quality, the EOL testing system combines electrical measurement methods, high-frequency tests, and mechanical functional tests.

Electrical Tests
Current and Voltage Measurements
Testing the Diagnostic Functions
Monitoring of Electrical Parameters
High-Frequency Testing
Frequency testing from 87.5 kHz to 2.7 GHz
Signal stimulation via a specially designed helical antenna
Testing of Radio, Navigation, Satellite, and Cellular Signals
High-frequency-density antenna connections
Mechanical and Functional Tests
Sensor-Based Mechanical Testing
Review of Automatic Recognition Features
Verification of Automatic Switching Functions
Process and Quality Assessment
Fully automated recording of test results
Reproducible measurement results
High process reliability
Complete documentation
Traceability in Mass Production
Features

The test solution combines MCD software, control and measurement technology, and an RF adapter specifically tailored to the multifunction antenna.

01
Test Software and Control System
MCD TestMATE, Toolmonitor DataManager, control components from MCD Elektronik, industrial computers
02
Signal Stimulation and High-Frequency Technology
Specially designed helical antenna, signal stimulation from 0.001 mW to 1 mW, high-frequency density adaptation, pneumatically controlled high-frequency contact, current ranging from 18 mA for GNSS to 100 mA for FM/DAB, network analyzer, RF module
03
Identification and System Integration
2D mini barcode scanner, ULC rack with network adapter, laser marker
End-to-End Inspection Solution for Mass Production

The combination of automated test software, product-specific high-frequency technology, and comprehensive documentation results in a reproducible end-of-line test solution for complex multifunction antennas. All relevant test values and results are automatically recorded and documented to ensure traceability in mass production.

FREQUENTLY ASKED QUESTIONS

FAQS

An EOL (End-of-Line) test system is a testing setup used in electronics manufacturing that is deployed directly at the end of the production line for the final quality inspection of electronic assemblies—in this case, vehicle antennas with different frequency interfaces. It combines electrical measurements, RF tests, and mechanical tests to ensure full functionality.
The test system covers a broad range of signal and function stimulation and evaluation. This includes precise current and voltage measurements as well as frequency testing, from low kHz ranges through to demanding RF applications. In addition, various communication and reception signals are tested, including conventional radio signals such as AM, FM and DAB, GNSS signals such as GPS and GLONASS, as well as satellite and mobile communication signals. The system also supports mechanical testing and comprehensive diagnostic functions to ensure the reliable operation of the assemblies.
Multifunction antennas are complex assemblies that must function reliably under real-world conditions (motion, interference, simultaneous use of multiple frequency bands). EOL testing ensures that signal quality, frequency response, and functionality are 100% verified before shipment.
The system utilizes specialized testing technologies such as RF-tight adaptation, pneumatic RF contacting, and a helical antenna specifically developed for this purpose to stimulate signals, as well as in-house software solutions such as TestMate and DataManager for evaluation and traceability.
In addition to multifunction antennas, the system can also be used with other RF and communications modules with minor modifications, such as transmitter and receiver modules, antenna amplifiers, telecommunications modules, or satellite receivers.

KEY FACTS

Key facts at a glance

Test System
End-of-Line Test System
Handling
Semi-automatic
Concept
Test cell with single-unit capability – 1 DUT per test sequence
Test Methods & Scope of Testing
Electrical: Voltage, Current
RF / Frequency: Frequency testing, antenna signal testing
Communications: Communication signal / Diagnostics
Mechanical: Load or mechanical testing
Components
MCD TestManager, MCD Tool Monitors, MCD Controller MIO1616, Multiplexer, Helix Antenna, RF Connectors, RF Adapters, Barcode Scanner

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