Split-Resonance Antenna Input for Millimeter-Wave 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 limitations in digital pre-distortion technology and space constraints, leading to increased power consumption and cost when using filters.
Innovation Solution
Incorporating a split resonance unit at the input port of the antenna to generate a transmission zero outside the passband, effectively suppressing out-of-band spurious emissions by setting the resonant frequency to match the spurious frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If digital pre-distortion technology is used to suppress out-of-band spurs, then the spurious emissions are reduced, but the power consumption and system complexity increase due to bandwidth throttling limitations and increased DAC sampling rate requirements
Solution Approach 1:
The patent extracts the spurious emission suppression function from the power amplifier and DPD system, implementing it directly at the antenna input port through a split resonance unit. This separates the suppression function from the main signal path, avoiding the need for high-speed DACs and complex digital processing, thereby reducing power consumption while maintaining suppression effectiveness.
Solution Approach 2:
The patent replaces the digital signal processing system (DPD with high-speed DACs) with an analog resonance-based filtering structure. The split resonance unit uses electromagnetic resonance principles to suppress spurious emissions, substituting complex digital mechanics with simpler analog field-based mechanics, thus reducing power consumption and system complexity.
2Object-generated harmful factors
If a filter is added to the output end of the power amplifier to suppress spurs, then out-of-band spurious emissions are reduced, but the cost and device complexity increase
Solution Approach 1:
The patent merges the spurious emission suppression function with the antenna input structure by integrating the split resonance unit directly at the antenna port. This combines the antenna feeding function with the filtering function in a single integrated structure, eliminating the need for separate filters and reducing overall system complexity.
Solution Approach 2:
The split resonance unit serves multiple functions: it acts as both the antenna input structure and the spurious emission filter. This multi-functional design eliminates the need for dedicated filter components, reducing device complexity while maintaining effective suppression of out-of-band spurs.
3Object-generated harmful factors
If a filter is added to suppress spurious emissions, then out-of-band spurs are reduced, but the layout space requirements increase which is not feasible for millimeter-wave base stations
Solution Approach 1:
The patent nests the split resonance unit within the antenna input structure, placing the filtering function inside the existing antenna footprint. This nested arrangement allows the suppression function to be embedded within the antenna itself, eliminating the need for additional external filter components and preserving宝贵的 layout space in compact millimeter-wave base stations.
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 achieves effective suppression of out-of-band spurs with minimal power consumption and cost, maintaining radiation performance while reducing system complexity and size.
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
AI summary
An antenna, antenna module, and electronic device. An 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. 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 which feeds the first radiating element. A split resonance unit is disposed at the third dielectric layer, and in signal connection with the feed line. The split resonance unit is disposed on an input port of the antenna. In response to the split resonance unit operating on a resonant frequency thereof, the split resonance unit generates a transmission zero near the resonant frequency of the split resonance unit.