Multi-Antenna System Harmonic Suppression via Frequency-Divisional Circuit
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Solution Overview
Problem
The aggregation of signals in different frequencies in 4G LTE wireless communication systems leads to harmonic desensitization, deteriorating antenna performance, and non-linear electronic components exacerbate this issue, necessitating a multi-antenna system capable of suppressing harmonics.
Innovation Solution
A multi-antenna system comprising a first antenna for a low-frequency band, a second antenna for a high-frequency band, a tunable circuit to switch between frequency bands, and a frequency-divisional circuit to suppress harmonics, which includes components like diplexers, low-pass filters, and high-pass filters to isolate and filter out harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier aggregation technology is used to operate on multiple frequency bands simultaneously, then communication capability is improved, but harmonic desensitization occurs and antenna performance deteriorates
Solution Approach 1:
The patent divides the antenna system into multiple independent antenna elements (first antenna for first frequency band, second antenna for second frequency band) with separate signal paths. Each antenna handles specific frequency bands independently, preventing harmonic interference between bands while maintaining carrier aggregation functionality.
Solution Approach 2:
The patent introduces a frequency divisional circuit as an intermediary component between the antennas and the radio frequency unit. This circuit includes filters that selectively pass desired frequency bands while blocking harmonics, thus mediating the signal flow to prevent harmonic desensitization while enabling multi-band operation.
2Adaptability or versatility
If non-linear electronic components are added to improve bandwidth, then bandwidth is improved, but harmonic desensitization worsens
Solution Approach 1:
The frequency divisional circuit acts as an intermediary that filters out harmonics generated by non-linear electronic components before they can cause desensitization. The circuit includes low-pass filters, high-pass filters, and band-pass filters that allow desired frequency bands to pass while blocking harmonic frequencies.
Solution Approach 2:
The patent extracts and removes harmful harmonic components from the signal path using the frequency divisional circuit. By separating and eliminating harmonics at the circuit level, the system can utilize non-linear components for bandwidth enhancement without suffering from their harmful harmonic effects.
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 system effectively suppresses harmonic desensitization, allowing for improved performance in carrier aggregation technology by isolating antennas and filtering out harmonics, thereby maintaining the integrity of LTE wireless communication standards.
Implementation Method 1
the frequency-divisional circuit is utilized to receive an external signal and divide the external signal into the signals of the first frequency band and the second frequency band
Implementation Method 2
the frequency-divisional circuit comprises a diplexer, a low-pass filter, a high-pass filter and/or a band-pass filter
Data Source
AI summary
A multi-antenna system is provided. The multi-antenna system includes a first antenna, a second antenna, a tunable circuit, and a frequency-divisional circuit. The first antenna is utilized to implement signals of a first frequency band. The second antenna is utilized to implement signals of a second frequency band. The second antenna is different from the first antenna, and frequencies of the second frequency band are greater than frequencies of the first frequency band. The tunable circuit is utilized to switch the signals of the first frequency band. The frequency-divisional circuit is utilized to suppress harmonics caused by the tunable circuit.