Microstrip Filtering Radiator for 4G-5G Antenna Isolation
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Solution Overview
Problem
The integration of 4G and 5G antennas in an array causes severe interference due to the radiation units of the 4G antenna affecting the 5G antenna, leading to beam deformation and inadequate isolation, and existing solutions with band-stop filters introduce discontinuities that hinder broadband operation.
Innovation Solution
A microstrip line filtering radiation oscillator with staggered metal sheets and coupling parts on a substrate, forming a continuous filtering structure that suppresses high-frequency interference while allowing low-frequency signals to be transmitted forward, and high-frequency signals to be suppressed, utilizing a dual-polarization design with integrated oscillator pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a band-stop filter is inserted on an arm of a low-frequency radiation unit to suppress induced current, then interference to high-frequency radiation is reduced, but discontinuities are introduced on oscillator arms causing difficulty in achieving broadband operation
Solution Approach 1:
The patent combines the filtering function and radiation function into a single integrated low-frequency radiation unit. The low-frequency radiation unit itself acts as the band-stop filter for high-frequency signals, eliminating the need for separate filtering structures. This integration avoids introducing discontinuities on oscillator arms while maintaining both filtering and radiation capabilities, thus resolving the contradiction between interference suppression and broadband operation.
Solution Approach 2:
The low-frequency radiation unit is designed to serve multiple functions simultaneously: it radiates low-frequency signals and also acts as a filter for high-frequency signals. By making the radiation unit universal (capable of both radiation and filtering), the patent eliminates the need for separate filtering components that would cause discontinuities, thereby maintaining broadband operation capability while suppressing interference.
2Object-affected harmful factors
If several independent filtering structures are loaded to suppress high-frequency induced current, then interference is reduced, but the complexity of the oscillator structure increases and matching is affected
Solution Approach 1:
Instead of loading several independent filtering structures on the oscillator arms, the patent merges the filtering function into the low-frequency radiation unit itself. The low-frequency radiation unit's structure naturally provides high-frequency filtering through its design, eliminating the need for multiple separate filtering components and thus reducing oscillator structure complexity while still suppressing high-frequency induced current.
Solution Approach 2:
The patent extracts the filtering function from the oscillator structure and relocates it to the low-frequency radiation unit. By taking out the filtering function from the oscillator arms and placing it in the radiation unit, the oscillator structure remains simple and maintains good matching, while the filtering function is still effectively performed by the radiation unit's design.
3Volume of moving object
If 4G and 5G antennas are integrated in an array to reduce volume, then space utilization is improved, but severe interference occurs between 4G and 5G radiation units
Solution Approach 1:
The patent converts the potential harm of the low-frequency radiation unit generating interference to high-frequency signals into a benefit by designing the low-frequency radiation unit to inherently filter high-frequency signals. The same structural features that enable low-frequency radiation also provide high-frequency filtering, thus allowing close integration of 4G and 5G antennas while eliminating interference through the radiation unit's own design rather than additional shielding or filtering components.
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 enables simultaneous transmission of low- and high-frequency signals with minimized interference, improving antenna integration and reducing volume, while achieving a larger bandwidth and enhanced port isolation.
Implementation Method 1
the oscillators are configured such that under the condition of the high frequency the oscillators appear as an open circuit, and under the condition of low frequency the oscillators appear as a short circuit
Implementation Method 2
a plurality of first metal sheets that are parallel to each other and are arranged at intervals are provided on a front surface of the substrate, a plurality of second metal sheets that are parallel to each other and are arranged at intervals are provided on a back surface of the substrate, and the first metal sheets and the second metal sheets are correspondingly staggered and coupled by a coupling part running through the substrate
Data Source
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AI summary
The present invention relates to a microstrip line filtering radiation oscillator, a filtering radiation unit, and an antenna. The microstrip line filtering radiation oscillator includes a substrate. A plurality of first metal sheets that are parallel to each other and are arranged at intervals are provided on a front surface of the substrate, a plurality of second metal sheets that are parallel to each other and are arranged at intervals are provided on a back surface of the substrate, and the first metal sheets and the second metal sheets are correspondingly staggered and coupled by a coupling part running through the substrate. The microstrip line filtering radiation oscillator of the present invention has functions of signal radiation and interference suppression. The filtering radiation unit includes at least one oscillator as described above and can be used in conjunction with a high-frequency radiation unit, to radiate a high-frequency signal and a low-frequency signal simultaneously. The antenna of the present invention includes at least one filtering radiation unit as described above, and can transmit a low-frequency signal and a high-frequency signal simultaneously, thereby effectively improving the integration of the antenna and reducing the volume of the antenna.