Multi-Port Slot Antenna Radiator for CMOS Power Efficiency
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Solution Overview
Problem
CMOS-based on-chip antennas face challenges in efficiently radiating RF and mm-wave power due to losses in printed circuit board substrates and difficulties in modeling the interface between CMOS ICs and PCBs, particularly at higher frequencies, leading to reduced output power and increased spectral occupancy.
Innovation Solution
A multi-port radiator design featuring closely spaced slot antennas driven by differential amplifiers with digital control, allowing for selective activation of amplifiers and impedance matching to enhance power radiation efficiency and reduce substrate mode excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If CMOS-based on-chip antennas are used to reduce fabrication cost and integrate with CMOS processes, then manufacturing cost and integration are improved, but power radiation efficiency deteriorates due to losses in PCB substrates and interface difficulties
Solution Approach 1:
The antenna is divided into multiple slot elements (N slot antennas) with specific spacing requirements. Each slot antenna is driven by separate amplifiers at multiple drive points, allowing independent control and optimization of each segment to improve overall radiation efficiency while maintaining CMOS integration
Solution Approach 2:
The radiator incorporates digitally controlled switches that can dynamically activate or deactivate specific amplifiers and slot combinations. This dynamic control allows the system to optimize power radiation efficiency by selectively engaging only the necessary antenna elements based on operating conditions, thereby reducing energy loss
2Volume of moving object
If the spacing between slot antennas is reduced to less than a wavelength (specifically ≤3/4 or ≤1/2 wavelength), then the radiator size is reduced and integration is improved, but the complexity of modeling and designing the antenna array increases
Solution Approach 1:
The patent specifies precise parameter ranges for slot spacing (≤3/4 wavelength, preferably ≤1/2 wavelength) and drive point distribution. By establishing these specific parameter guidelines, the patent simplifies the design process while achieving compact radiator size, transforming a complex design problem into a parameter-based solution
3Loss of energy
If multiple amplifiers are used to drive each slot antenna at multiple drive points to improve power radiation efficiency, then power conversion efficiency is improved, but the device complexity and control requirements increase
Solution Approach 1:
Multiple amplifiers are configured to drive a single slot antenna at multiple drive points, creating a multi-functional system where each amplifier can independently contribute to the overall radiation pattern. This universal approach allows the same amplifier design to be replicated across multiple drive points, improving power conversion efficiency while using standardized components
Solution Approach 2:
The digitally controlled switches enable feedback-based control where the system can monitor and adjust which amplifiers are active based on operating conditions. This feedback mechanism optimizes power conversion efficiency by dynamically adjusting the amplifier configuration while managing the complexity through automated control
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 multi-port radiator achieves high efficiency by combining power from multiple CMOS amplifiers, reducing output driving impedance, and maintaining high power conversion efficiency across a wide range of output power levels, thus addressing the limitations of existing CMOS radiators.
Implementation Method 1
N slot antennas wherein the spacing between each pair of adjacent slot antennas is less than a wavelength of the electromagnetic signal being transmitted or received by the radiator
Implementation Method 2
each differential amplifier includes, in part, a pair of MOS transistors generating a pair of differential voltages applied to a pair of drive points positioned along a pair of associated adjacent slot antennas
Data Source
AI summary
A radiator is formed by forming a multitude of slot antennas adjacent one another such that the spacing between each pair of adjacent slot antennas is smaller than the wavelength of the signal being transmitted or received by the radiator. The radiator achieves high efficiency by reducing the excitation of substrate modes, and further achieves high output power radiation by combining power of multiple CMOS power amplifiers integrated in the radiator structure. Impedance matching to low-voltage CMOS power amplifiers is achieved through lowering the impedance at the radiator ports. Each output power stage may be implemented as a combination of several smaller output power stages operating in parallel, thereby allowing the combination to utilize an effective output device size commensurate with the impedance of the radiator.