Antenna Feed Split Resonator for Out-of-Band Spur Suppression
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Solution Overview
Problem
Existing base stations struggle with out-of-band spurious emissions in millimeter wave frequency bands, particularly in the 26 GHz band, due to limited bandwidth and increased power consumption of digital pre-distortion technologies, and spatial constraints hinder the use of filters for suppression.
Innovation Solution
Incorporating a split resonance unit at the input port of the antenna to generate a transmission zero outside the passband, utilizing a feed line connection with the split resonance unit to create a stopband that suppresses out-of-band spurious emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If digital pre-distortion technology is used to suppress out-of-band spurious emissions, then the suppression effect is improved, but the bandwidth is limited and power consumption increases
Solution Approach 1:
The patent replaces the digital pre-distortion electronic system with a passive electromagnetic resonance structure (split resonance unit). This resonant structure creates a transmission zero at the spurious frequency band through its physical resonance characteristics, eliminating the need for active digital signal processing and power-consuming components.
Solution Approach 2:
The patent changes the suppression mechanism from active digital parameter adjustment to passive resonant frequency design. By carefully designing the resonant frequency of the split resonance unit to match the spurious emission frequency, the system achieves suppression through physical parameter matching rather than computational parameter adjustment.
2Object-generated harmful factors
If a filter is added to the output end of the power amplifier to suppress spurious emissions, then the suppression effect is improved, but the layout space requirement increases
Solution Approach 1:
The patent transitions the suppression function from the spatial domain (physical filter placement) to the frequency domain (resonant frequency design). The split resonance unit creates frequency-selective suppression through its resonant characteristics rather than through physical filtering in the signal path, effectively utilizing the frequency dimension for suppression.
Solution Approach 2:
The patent integrates the split resonance unit within the existing antenna structure, nesting the suppression function inside the antenna's feed network. This allows the suppression mechanism to be embedded within the existing layout without requiring additional external filter components or increasing the overall device footprint.
3Object-generated harmful factors
If digital pre-distortion technology with broadened correction bandwidth is used to suppress fifth-order nonlinear spurious emissions, then the suppression coverage is improved, but the DAC sampling rate and algorithm overheads increase
Solution Approach 1:
The patent replaces complex digital signal processing systems (DAC, algorithms) with a simple passive resonant structure. The split resonance unit provides broad frequency suppression coverage through its physical resonance properties without requiring high-speed digital conversion or complex computational algorithms.
Solution Approach 2:
The patent uses a simple, low-cost passive resonant structure instead of expensive, complex digital processing systems. The split resonance unit achieves suppression functionality with minimal components and no power consumption, effectively replacing costly digital infrastructure.
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
Effectively suppresses out-of-band spurious emissions by generating a transmission zero near the resonant frequency, reducing interference and maintaining efficient energy use without increasing system size or cost.
Implementation Method 1
When the split resonance unit operates on a resonant frequency thereof, the split resonance unit may generate a transmission zero near the resonant frequency of the split resonance unit
Data Source
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AI summary
This application discloses an antenna, an antenna module, and an electronic device. The antenna includes a first dielectric layer, a second dielectric layer, and a third dielectric layer. The second dielectric layer and the third dielectric layer are disposed on a same side of the first dielectric layer, and the second dielectric layer and the third dielectric layer are disposed at different layers. A first radiating element is disposed at the first dielectric layer. A feed line is disposed at the second dielectric layer, and the feed line feeds the first radiating element. A split resonance unit is disposed at the third dielectric layer, and the split resonance unit is in signal connection with the feed line. The split resonance unit is disposed on an input port of the antenna in this application. When the split resonance unit operates on a resonant frequency thereof, the split resonance unit may generate a transmission zero near the resonant frequency of the split resonance unit. A stopband near the transmission zero may suppress a signal. The antenna may set the resonant frequency of the split resonance unit based on an out-of-band spurious frequency band, to implement the transmission zero and form the stopband in the frequency band, thereby suppressing out-of-band spur of the antenna.