Bias T Circuit Noise Isolation for WiGig and Wi-Fi Coexistence
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Solution Overview
Problem
Current bias T circuits are unable to effectively remove noise from a frequency band used by one radio communication method and prevent it from entering the power supply line, leading to communication quality degradation in electronic apparatuses with multiple radio communication units.
Innovation Solution
A bias T circuit with series-connected inductors and a filter having attenuation characteristics in a specific frequency band, where the filter is connected between the signal line and the first-stage inductor, allowing for noise removal and prevention of noise entry into the power supply line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bias T circuit uses only inductors to block high-frequency signals from entering the power supply line, then isolation in high-frequency bands is improved, but noise in other frequency bands cannot be removed
Solution Approach 1:
The bias T circuit is divided into multiple functional stages: a first inductor for high-frequency signal isolation, a filter for removing noise in specific frequency bands, and a second inductor for additional isolation. This segmentation allows each component to address specific frequency ranges, resolving the contradiction between high-frequency isolation and noise removal in other bands.
Solution Approach 2:
A filter is introduced as an intermediary component between the inductors in the bias T circuit. This filter acts as a mediator that specifically targets and removes noise in predetermined frequency bands while allowing the inductors to handle high-frequency signal isolation, thus resolving the contradiction without compromising either function.
2Area of stationary object
If multiple radio communication units are disposed close to each other in an electronic apparatus, then space utilization is improved, but noise interference between units increases
Solution Approach 1:
The filter extracts and removes noise components in predetermined frequency bands from the signal line before they can interfere with other radio communication units. By taking out the harmful noise elements while maintaining close proximity of multiple units, the contradiction between space utilization and noise interference is resolved.
3Object-generated harmful factors
If a filter is added to the bias T circuit to remove noise in specific frequency bands, then noise removal capability is improved, but circuit complexity increases
Solution Approach 1:
The bias T circuit is designed with multi-functionality: the inductors provide both DC blocking and high-frequency isolation, while the filter provides noise removal in specific frequency bands. By making the circuit universally capable of handling multiple frequency-related functions, the added complexity is justified by the significant improvement in noise removal capability across different frequency ranges.
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
The solution effectively attenuates noise in the specified frequency band, preventing it from affecting other radio communication units and ensuring improved communication quality by isolating noise from the power supply line.
Implementation Method 1
adjusting the inductances of inductors connected in series in a bias circuit to increase impedances in the frequency bands of the high-frequency signals
Implementation Method 2
a filter having attenuation characteristics in a predetermined frequency band used by another of the plurality of radio communication units
Data Source
AI summary
An electronic apparatus includes a radio communication unit employing a WiGig method and a radio communication unit employing a Wi-Fi method. A bias T circuit is included in the radio communication unit employing the WiGig method. The bias T circuit includes inductors and a filter. The inductors are disposed between a signal line and a DC-DC converter, and are connected in series to each other. The filter has attenuation characteristics in a frequency band used by the radio communication unit employing the Wi-Fi method. One end of the filter is connected between the signal line and one of the inductors located at a first stage from the signal line.