Plastic Waveguide for EHF Radiation Capture in ATE Testing
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Solution Overview
Problem
Existing test systems face challenges in accurately measuring electromagnetic radiation from wireless communication devices, particularly at Extremely High-Frequency (EHF) ranges, due to the bulky size of horn antennas and the attenuation of low-power signals, making it difficult to collect and detect radiation within close proximity to the transmitter.
Innovation Solution
The use of a plastic waveguide with high relative permittivity and low loss characteristics to capture and transport EHF electromagnetic radiation from the near-field envelope to a detector, allowing the radiation to be carried over longer distances and enabling testing of transmitters and receivers in close proximity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a horn antenna is used to measure electromagnetic radiation, then radiation can be effectively collected, but the antenna becomes large and bulky, making it impractical for close-proximity testing
Solution Approach 1:
The patent changes the material parameter of the waveguide from traditional metal to plastic with high relative permittivity. This parameter change allows the waveguide to effectively guide EHF radiation while maintaining a much smaller size compared to metal horn antennas, resolving the contradiction between detection capability and physical size
Solution Approach 2:
The patent replaces the traditional metal horn antenna structure with a plastic waveguide structure. This substitution enables the system to maintain radiation collection capability while achieving a compact form factor suitable for close-proximity testing, addressing the size issue of conventional antennas
2Reliability
If a detector is placed close to the transmitter to capture low-power signals, then signal strength is sufficient, but the test fixture becomes bulky and difficult to implement
Solution Approach 1:
The patent introduces a plastic waveguide as an intermediary component between the transmitter and detector. This waveguide captures EHF radiation in the near-field region and transports it to the detector, enabling accurate signal detection without requiring the detector to be positioned extremely close to the transmitter, thus simplifying the test fixture design
Solution Approach 2:
The patent replaces the need for complex mechanical positioning systems with a plastic waveguide that passively guides radiation. This substitution eliminates bulky mechanical structures while maintaining reliable signal detection, reducing overall device complexity
3Measurement precision
If traditional metal waveguides are used, then radiation can be guided effectively, but the waveguides are large and not suitable for EHF close-proximity testing
Solution Approach 1:
The patent changes the material parameter from metal to plastic with high relative permittivity. This parameter change reduces the waveguide dimensions while maintaining effective EHF radiation guidance, resolving the contradiction between radiation transport capability and physical size
Solution Approach 2:
The patent uses plastic material with high relative permittivity as a composite alternative to traditional metal waveguides. This material choice enables effective EHF radiation guidance with reduced dimensions, addressing the size limitation of conventional metal waveguides
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 solution allows for the effective collection and detection of small amounts of EHF electromagnetic radiation, enabling accurate testing of transmitters and receivers even when the detector is placed relatively far away from the transmitter, overcoming the limitations of traditional horn antennas and improving test system efficiency.
Implementation Method 1
capture and transport EHF electromagnetic radiation from the near-field envelope to a detector
Implementation Method 2
plastic waveguide with high relative permittivity and low loss characteristics
Data Source
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AI summary
A test fixture has a flexible plastic cable that acts as a waveguide. The Device-Under-Test (DUT) is a small transceiver and antenna that operate in the Extremely High-Frequency (EHF) band of 30-300 GHz. The size of the DUT transceiver is very small, limiting the power of emitted electromagnetic radiation so that close-proximity communication is used. The envelope for reception may only extend for about a centimeter from the DUT transceiver, about the same size as the test socket. A slot is formed in the test socket very near to the antenna. The slot receives one end of the plastic waveguide. The slot extends into the envelope by the DUT transceiver so that close-proximity radiation is captured by the plastic waveguide. The waveguide has a high relative permittivity and reflective metalized walls so that the radiation may be carried to a receiver that is outside the envelope.