Reflective Phased Antenna Arrays for >100 GHz Duplex Links
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Solution Overview
Problem
Electronic devices face challenges in supporting high data rates due to limitations in wireless circuitry, particularly in implementing resource-efficient and space-efficient wireless communications at frequencies greater than 100 GHz, where existing technologies struggle to effectively transmit and receive signals using different antennas for both tasks.
Innovation Solution
The implementation of a phased antenna array with uni-travelling-carrier photodiodes (UTC PDs) and optical signal paths, utilizing a time division duplexing scheme, and optical local oscillators to transmit, receive, and reflect wireless signals at frequencies above 100 GHz, allowing for signal beam forming and space-time coding, while adjusting impedance mismatches to encode information and steer signal beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate antennas are used for transmission and reception at frequencies greater than 100 GHz, then transmission and reception functions are fulfilled, but space efficiency and resource efficiency deteriorate
Solution Approach 1:
The patent implements a single antenna that serves both transmission and reception functions at frequencies greater than 100 GHz. The antenna is designed with a radiating element coupled to a photodiode that can operate in different modes (transmit, receive, passive reflector) to fulfill multiple functions, thereby reducing the number of antennas needed and improving space efficiency.
Solution Approach 2:
The patent uses a programmable photodiode that can dynamically switch between different operating modes (transmit, receive, passive reflector) based on the required function. This dynamic reconfigurability allows a single antenna to adapt its behavior for different communication tasks, eliminating the need for separate fixed-function antennas.
2Area of stationary object
If a single antenna is used for both transmission and reception, then space efficiency improves, but it becomes difficult to implement resource-efficient wireless circuitry for handling high data rates
Solution Approach 1:
The patent replaces traditional electrical RF circuitry with an optical-based system. A photodiode converts optical signals to electrical signals for high-frequency operation greater than 100 GHz. This substitution enables a single antenna to handle high data rates efficiently by using optical local oscillators and photodetection rather than complex electrical signal processing circuits.
Solution Approach 2:
The patent introduces an optical intermediary (optical local oscillators and photodiode) between the antenna and the baseband processing circuitry. This optical intermediary enables high-frequency operation and simplifies the overall system architecture by performing signal mixing and frequency conversion in the optical domain, reducing the complexity of RF circuitry.
3Adaptability or versatility
If UTC PDs are controlled to exhibit impedance mismatches, then phase shifts and frequency shifts are imparted on reflected signals for encoding information, but impedance matching for optimal signal transmission is compromised
Solution Approach 1:
The patent uses a programmable photodiode that can dynamically adjust its output impedance to create controlled mismatches with the antenna radiating element. This dynamic impedance control enables the system to switch between impedance-matched operation (for optimal signal transmission) and impedance-mismatched operation (for encoding information through phase and frequency shifts on reflected signals).
Solution Approach 2:
The patent changes the electrical impedance parameter of the photodiode to control the reflection characteristics of the antenna. By adjusting the photodiode's output impedance, the system can impart desired phase shifts and frequency shifts on reflected signals for information encoding, while maintaining the ability to return to impedance-matched operation for optimal signal transmission when encoding is not required.
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 and high-data-rate wireless communications at frequencies above 100 GHz, minimizing space and resource consumption by using the same antenna and signal path for both transmission and reception, and allows for passive reflection of signals with controlled phase and frequency shifts, enhancing communication capabilities.
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
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.