Millimeter-Wave Antenna Array Testing via Near-Field Far-Field Emulation
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Solution Overview
Problem
Current methods for testing millimeter wave integrated circuits with integrated antennas are slow, expensive, and unable to economically test a large number of antenna arrays due to the need for large anechoic chambers to achieve far-field conditions, making it costly and inefficient for high-volume production testing.
Innovation Solution
A system and method that performs calibration operations on a reference device to determine calibration parameters, allowing a probe antenna system to transmit signals from a near-field location to emulate far-field conditions, enabling rapid and inexpensive testing of integrated circuits with integrated antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If far-field testing conditions are used to accurately characterize antenna arrays, then measurement accuracy is improved, but the required test chamber size and cost increase significantly
Solution Approach 1:
The patent creates a virtual far-field environment by copying the electromagnetic field characteristics of far-field conditions through near-field measurements and computational processing. The system measures fields in the near-field region and uses algorithms to reconstruct what the far-field response would be, eliminating the need for physically large anechoic chambers while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces computational algorithms and signal processing techniques as intermediaries between the near-field measurements and the desired far-field characterization. These computational tools act as a bridge, transforming near-field data into accurate far-field antenna array patterns without requiring physical far-field test environments.
2Reliability
If traditional far-field testing methods are used, then regulatory compliance is achieved, but testing speed and productivity decrease due to large chamber requirements
Solution Approach 1:
The system copies far-field measurement capabilities into a compact near-field setup, enabling rapid testing that maintains regulatory compliance. By measuring in the near-field and computationally deriving far-field patterns, the system achieves both speed and compliance without the time-consuming logistics of large chamber setups.
Solution Approach 2:
The patent changes the fundamental testing parameter from far-field distance to near-field proximity, combined with computational processing. This parameter change allows testing to be performed much closer to the device under test, dramatically reducing test setup time and increasing throughput while still delivering compliant results through algorithmic transformation of the measured data.
3Adaptability or versatility
If multiple antenna-in-package modules are tested to meet 5G requirements, then device performance is improved, but testing cost and complexity increase prohibitively
Solution Approach 1:
The patent creates a universal testing system that can characterize multiple antenna-in-package modules and various 5G device configurations using a single compact near-field setup. The computational framework is adaptable to different antenna arrays and frequencies, providing multi-functional capability that simplifies testing of complex 5G devices compared to dedicated far-field chambers for each configuration.
Solution Approach 2:
The system copies the essential far-field characterization capability into a near-field measurement framework, enabling simplified testing of multiple 5G modules. By using computational algorithms to reproduce far-field patterns from near-field data, the system handles complex multi-module configurations without requiring proportionally complex test infrastructure.
4Measurement precision
If large anechoic chambers are constructed to enable far-field testing, then accurate antenna measurements are obtained, but capital cost and operational expense increase
Solution Approach 1:
The patent copies far-field measurement functionality into a compact near-field system, eliminating the need for expensive large-scale anechoic chambers. The computational processing of near-field data reproduces accurate antenna patterns at a fraction of the capital cost of traditional far-field facilities.
Solution Approach 2:
The patent replaces expensive, permanent infrastructure (large anechoic chambers) with a more economical near-field measurement system combined with computational processing. This substitution dramatically reduces both capital expenditure and operational costs while maintaining measurement accuracy through algorithmic transformation of the measured data.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the cost-effective and efficient testing of a large number of devices by emulating far-field conditions in a near-field location, reducing the need for large test chambers and improving the speed and efficiency of antenna array testing.
Implementation Method 1
a probe antenna system (PAS) to transmit an array transmission to the DUT from a near-field location to emulate a single probe or multi-probe transmission from one or more far-field locations
Data Source
AI summary
A system and method for testing devices such as integrated circuits (IC) with integrated antenna arrays configured for wireless signal reception. The method performs a calibration operation on a reference device under test (DUT). During the calibration operation, the DUT receives a series of first signals from a first far-field (FF) location and a series of array transmissions from a second near-field (NF) location using different beamforming settings, and determines therefrom a set of calibration parameters. The calibration parameters may be used by a probe antenna system (PAS) to transmit an array transmission to the DUT from the second NF location to emulate a single probe or multi-probe transmission from the first FF location.