Parallel Antenna Filter Circuit With Impedance Matching for 5G Arrays
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Solution Overview
Problem
The increasing number of antennas and RF parts in 5G communication devices necessitates a reduction in filter size and power consumption while maintaining performance, as conventional high-power filters are bulky, require manual tuning, and hinder mass production.
Innovation Solution
Implementing a combine filter structure with multiple low-power filters, each with impedance matching circuits, to distribute power and reduce impedance mismatch, allowing for miniaturization and mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional high-power filters are used to handle power amplifier output, then the filter can process the full power, but the filter size becomes large and manual tuning is required
Solution Approach 1:
The patent divides a single high-power filter into multiple low-power filters that operate in parallel. Each low-power filter handles a portion of the total power, allowing the use of smaller, standardized filter components instead of one large high-power filter. This segmentation enables miniaturization while maintaining the required power handling capability through parallel operation.
Solution Approach 2:
The patent combines multiple low-power filters in parallel to achieve the equivalent performance of a single high-power filter. By merging the filtering capabilities of multiple smaller filters, the system maintains the required power handling and frequency selectivity while using compact, mass-producible components instead of bulky conventional filters.
2Power
If conventional high-power filters are used, then the filter can handle full power output, but manufacturing complexity increases and mass production becomes difficult
Solution Approach 1:
The patent segments the high-power filtering function into multiple low-power filter units, each of which can be manufactured using standardized processes. This segmentation allows low-power filters to be produced through automated assembly and testing, eliminating the need for manual tuning and complex manufacturing procedures associated with conventional high-power filters.
Solution Approach 2:
The patent changes the power parameter of the filter components from high-power to low-power, enabling the use of standardized, mass-producible components. This parameter change allows filters to be manufactured with automated equipment and tested using standardized procedures, significantly improving ease of manufacture and enabling mass production.
3Volume of moving object
If multiple low-power filters are used in parallel, then the filter size is reduced, but impedance mismatch problems occur
Solution Approach 1:
The patent introduces impedance matching circuits as intermediary components between the parallel low-power filters and the signal source/load. These matching circuits act as mediators that transform the combined impedance of the parallel filters to match the source and load impedances, eliminating reflection and standing wave issues while preserving the size benefits of using multiple low-power filters.
4Manufacturing precision
If conventional filters require manual tuning, then performance can be optimized, but productivity decreases and defects increase
Solution Approach 1:
The patent segments the filtering function into multiple identical low-power filter units, each with standardized characteristics. This segmentation eliminates the need for individual manual tuning of each filter, as all units can be manufactured with consistent parameters and deployed in parallel, significantly improving productivity while maintaining performance through the combined effect of multiple filters.
Solution Approach 2:
The patent changes the power parameter from high to low, enabling the use of standardized components that do not require manual tuning. This parameter change allows filters to be manufactured with automated equipment using precise control of electrical parameters, eliminating manual intervention and enabling high-volume production with consistent quality and reduced defects.
Data Source
AI summary
A 5th generation (5G) or pre-5G communication system for supporting a higher data transfer rate than 4th generation (4G) communication systems such as long term evolution (LTE). An apparatus for radiating a signal in a wireless communication system may include: a power amplifier; a sub array including a plurality of antenna elements; and filter circuitry configured to transfer an output signal of the power amplifier to the sub array and including an input end and an output end. The filter circuitry may include: a first impedance matching circuit connected with the power amplifier; a second impedance matching circuit connected with the sub array; and a plurality of filters coupled in parallel to each of the first impedance matching circuit and the second impedance matching circuit. An impedance of the input end is matched with a sum of an impedance of the plurality of filters and an impedance of the first impedance matching circuit. An impedance of the output end is matched with a sum of the impedance of the plurality of filters and an impedance of the second impedance matching circuit.