Tunable Harmonic Filter Bank for Multi-Band High-Power RF
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Solution Overview
Problem
High-power harmonic filter banks for RF radio front ends become increasingly complex, large, and power-consuming as the number of operating frequencies increases, necessitating improved harmonic filtering systems with reduced complexity, size, and power consumption.
Innovation Solution
A high-power, frequency-tunable harmonic filtering system utilizing a single-pole, multi-throw (SPMT) switch circuitry and multiple high-power, frequency-tunable harmonic filters (HFHFs) with a controller to selectively tune the frequency response and connect RF signal pathways, allowing each operating frequency to be associated with a specific cutoff frequency and filter harmonics effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-power harmonic filter bank is placed between the power amplifier and the antenna for multiple operating frequencies, then harmonic filtering effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal filter bank where a single filter structure can handle multiple operating frequencies through frequency tuning capability. The filter bank is designed to be reconfigurable, allowing each filter to adapt its cutoff frequency to match different fundamental frequencies, thus one filter structure serves multiple functions across different frequency bands
Solution Approach 2:
The filter bank incorporates dynamic frequency tuning capability through voltage-controlled elements that allow the cutoff frequency of each filter to be adjusted in real-time. This dynamic adjustment enables the same filter hardware to effectively filter harmonics for different operating frequencies without requiring separate fixed-frequency filters for each frequency
2Reliability
If a high-power harmonic filter bank is placed between the power amplifier and the antenna for multiple operating frequencies, then harmonic filtering effectiveness is improved, but the system size increases
Solution Approach 1:
The patent implements a universal filter bank where a single filter structure can handle multiple operating frequencies through frequency tuning capability. The filter bank is designed to be reconfigurable, allowing each filter to adapt its cutoff frequency to match different fundamental frequencies, thus one filter structure serves multiple functions across different frequency bands
Solution Approach 2:
The patent combines multiple filter functions into a single integrated filter bank structure. By merging the functionality of multiple fixed-frequency filters into one reconfigurable filter bank with shared components and control logic, the overall system footprint is reduced while maintaining the ability to filter harmonics across multiple frequency bands
3Reliability
If a high-power harmonic filter bank is placed between the power amplifier and the antenna for multiple operating frequencies, then harmonic filtering effectiveness is improved, but power consumption increases
Solution Approach 1:
The filter bank incorporates dynamic frequency tuning capability through voltage-controlled elements that allow the cutoff frequency of each filter to be adjusted in real-time. This dynamic adjustment enables the same filter hardware to effectively filter harmonics for different operating frequencies without requiring separate fixed-frequency filters for each frequency
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 reduces complexity and power consumption while effectively filtering harmonics across multiple operating frequencies, achieving a smaller footprint and minimizing heat generation, thus enhancing the reliability and efficiency of RF signal processing.
Implementation Method 1
A harmonic filter is a filter that reduces (filters) harmonics from a signal. A harmonic filter can be regarded as a low-pass filter that has a cutoff frequency between the fundamental frequency and the second-order harmonic frequency.
Data Source
AI summary
A high-power, frequency-tunable, harmonic filtering system for multiple operating frequencies includes a first SPMT switch circuitry, a second SPMT switch circuitry, and high-power, frequency-tunable harmonic filters (HFHFs). The first SPMT single-pole terminal is configured to receive a high-power RF input signal. The second SPMT single-pole terminal is configured to output a high-power RF output signal. Each of the HFHFs is connected to a respective one of the first SPMT multi-throw terminals and a respective one of the second SPMT multi-throw terminals. Each of the HFHFs is interposed between the respective first and second multi-throw terminals along a respective RF signal pathway between them. Each operating frequency is associated with one of the HFHFs. The respective operating frequency is associated with one of multiple cutoff frequencies of the respective HFHF. A frequency response of each of the HFHF is tunable to multiple cutoff frequencies in accordance with selection of respective shunt capacitances selectable under control of a controller.