Multiband Antenna Switching Unit for Spurious Harmonic Control
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Solution Overview
Problem
Multiband antennas in electronic devices often experience radio spurious emission (RSE) due to spurious harmonics generated when signals higher than the Vpeak value are applied, which can deteriorate communication performance and fail to meet pre-defined RSE standards.
Innovation Solution
A multiband antenna-equipped electronic device with a switching unit comprising multiple switches is designed to prevent RSE by removing spurious harmonics and parasitic loops, allowing the device to meet RSE standards by controlling the switching paths based on the selected frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is applied to the multiband antenna for signal switching, then the antenna can selectively use multiple frequency bands, but spurious harmonics are generated when signals higher than Vpeak are applied, causing radio spurious emission (RSE)
Solution Approach 1:
The switching unit is divided into multiple switches (first switch, second switch, third switch, fourth switch) that can be independently controlled. This segmentation allows selective activation of specific switching paths for different frequency bands, enabling the system to avoid generating spurious harmonics by using appropriate switching configurations for each band.
Solution Approach 2:
The switching unit acts as an intermediary between the communication unit and the multiband antenna. By controlling the switching paths through the multiple switches, it mediates the signal flow to prevent spurious harmonics from reaching the antenna, thus eliminating RSE while maintaining multiband functionality.
2Object-generated harmful factors
If multiple switches are used in the switching unit to control switching paths, then spurious harmonics can be removed, but the device complexity increases
Solution Approach 1:
The switching unit with multiple switches serves multiple functions: it enables multiband signal switching, removes spurious harmonics, and prevents parasitic loops. By consolidating these functions into a single multi-switch configuration, the patent avoids the need for separate components for each function, thereby managing complexity efficiently.
Solution Approach 2:
The patent combines the signal switching function and the spurious harmonic removal function into a single switching unit structure. The same switches that route signals to different frequency bands also serve to block spurious harmonics, merging multiple functions into one integrated system rather than using separate components.
3Reliability
If switches are controlled to form different paths for different frequency bands, then communication performance is optimized, but parasitic loops may occur in off-state switches
Solution Approach 1:
The patent extracts and eliminates parasitic loops by carefully designing the switching configuration. The off-state switches are positioned and configured such that they do not create closed loops in the circuit, effectively removing this potential source of interference while maintaining the necessary switching paths for different frequency bands.
Data Source
AI summary
A multiband antenna-equipped electronic device is provided. An electronic device includes a housing, a memory, an antenna for multi-band communication, a communication unit processing a radio frequency (RF) signal using the antenna, a switching unit including a first switch connected with a first point of the antenna, a second switch connected between the first switch and a second point of the antenna, a third switch connected with a third point of the antenna, a fourth switch connected between the second point and the third switch, a fifth switch connected between a first node between the first switch and the second switch and a ground, and a sixth switch connected between a second node between the third switch and the fourth switch and the ground, and a processor electrically connected with the memory, the communication unit, and the switching unit.