Reflective Phased Antenna Arrays for >100 GHz Beam Steering
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Solution Overview
Problem
Existing electronic devices face challenges in supporting high data rates for wireless communications due to limitations in radio-frequency signal frequencies and inefficiencies in implementing wireless circuitry that consume excessive space and resources.
Innovation Solution
The integration of a phased antenna array with programmable uni-travelling-carrier photodiodes (UTC PDs) and optical signal paths allows for wireless signals to be transmitted, received, and reflected at frequencies greater than 100 GHz, utilizing time division duplexing and optical phase shifts for signal beam forming and encoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless circuitry uses traditional radio-frequency signals at lower frequencies, then the device can maintain simpler circuitry and lower power consumption, but the data rate is limited and cannot support high-speed wireless communications
Solution Approach 1:
The patent replaces traditional radio-frequency electronic circuitry with an optical-based wireless communication system. Optical signals are used to modulate and transmit wireless communications, substituting the conventional electronic signal processing mechanism with an optical modulation approach using LEDs or lasers, thereby achieving higher data rates while managing circuitry complexity through different physical domain operations
Solution Approach 2:
The system changes the fundamental operating parameter from radio-frequency electromagnetic waves to optical frequency electromagnetic waves. By operating at optical frequencies (visible or infrared spectrum), the system achieves significantly higher bandwidth and data rates compared to traditional RF systems, while using LED or laser diodes as the radiation source instead of traditional RF amplifiers and antennas
2Productivity
If electronic devices implement wireless circuitry for high data rates, then the data transmission capability is improved, but the space and resources required for antenna implementation increase
Solution Approach 1:
The patent makes the antenna system multi-functional by enabling it to operate in three distinct modes: transmit mode for active wireless communication, receive mode for signal reception, and passive reflector mode for signal reflection without active electronics. This universality allows a single antenna structure to perform multiple functions, reducing the need for separate dedicated antennas for each function and thereby saving space
Solution Approach 2:
The antenna incorporates dynamically controllable photodiodes that can switch between different operational states (transmit, receive, reflect) based on control signals. This dynamic reconfigurability allows the antenna to adapt its function in real-time, optimizing performance for different operational requirements while using the same physical structure, thus reducing the overall space needed
3Use of energy by moving object
If antennas are not always used to actively transmit or receive signals, then power consumption is reduced, but the ability to support high data rates when needed is compromised
Solution Approach 1:
The system dynamically switches between active transmission/reception modes and passive reflector mode based on operational needs. When high data rate communication is required, the photodiodes are activated in transmit or receive mode. When communication is not needed but signal reflection is useful, the system switches to passive reflector mode with reduced power consumption, achieving adaptive power management while maintaining data rate capability when needed
Solution Approach 2:
Different portions of the antenna system can be in different operational states simultaneously. Some photodiodes can be active for transmission or reception while others remain in passive reflector mode, allowing localized optimization of power consumption based on specific communication requirements, thereby reducing overall power usage while maintaining necessary data rate capabilities
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
This approach enables efficient use of space and resources by allowing a single antenna to transmit and receive high-frequency signals, supporting data rates up to 5-10 Gbps while minimizing space consumption and resource usage.
Implementation Method 1
The antenna may include an antenna radiating element coupled to a programmable photodiode such as a uni-travelling-carrier photodiode (UTC PD). The optical signal path may illuminate the UTC PD using a first optical local oscillator (LO) signal and a second optical LO signal
Implementation Method 2
The antenna radiating element can be configured to reflect wireless signals at the frequency while the photodiode is in the first mode
Implementation Method 3
If desired, an optical phase shift may be applied to the first optical LO signal. This may allow for signal beam forming in implementations where the antenna is formed in a phased antenna array
Data Source
AI summary
An electronic device may include a photonics-based phased antenna array that conveys wireless signals at frequencies greater than 100 GHz. In a transmit mode, the array may transmit signals using the first and second optical signals. In a receive mode, the array may receive signals using the optical signals. In a passive mode, the array may reflect incident wireless signals as reflected signals. Photodiodes in the array may be controlled to exhibit output impedances that are mismatched with respect to input impedances of radiating elements in the array. Different mismatches can be used across the array or as a function of time to impart different phase and/or frequency shifts on the reflected signals. The phase shifts may be used to encode information into the reflected signals and/or to form a signal beam of the reflected signals.