UTC Photodiode Antenna for 100+ GHz Wireless Transmission
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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 use of a uni-travelling-carrier photodiode (UTC PD) coupled with optical signal paths and a Mach-Zehnder modulator to transmit and receive wireless signals at frequencies greater than 100 GHz, utilizing a time division duplexing scheme and optical phase shifts to enable beam forming in phased antenna arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless circuitry uses traditional radio-frequency signals to support high data rates, then data rate requirements can be met up to a certain point, but the maximum data rate is limited by the frequency of the radio-frequency signals
Solution Approach 1:
The patent replaces traditional radio-frequency electrical signal transmission with optical signal transmission using photodiodes. The optical local oscillator signals illuminate the photodiode, which converts optical signals to electrical currents at frequencies greater than 100 GHz on the antenna radiating element, enabling extremely high data rates that exceed traditional RF limitations
Solution Approach 2:
The patent changes the fundamental operating parameter from radio-frequency electrical signals to optical frequencies. By using optical local oscillator signals and photodiode conversion, the system operates at frequencies greater than 100 GHz, representing a parameter change from traditional RF bands to optical/THz bands, thereby achieving unprecedented data rates
2Reliability
If separate antennas and circuitry are used for transmission and reception at high frequencies, then communication reliability is improved, but space and resource consumption increase
Solution Approach 1:
The patent merges the transmission and reception functions into a single antenna system. The same antenna radiating element and optical signal path are used for both transmitting wireless signals and receiving wireless signals, eliminating the need for separate antenna arrays and reducing space consumption while maintaining full-duplex communication capability through time division duplexing
Solution Approach 2:
The antenna and optical signal path are designed to perform multiple functions: they can transmit wireless signals during one time period and receive wireless signals during another time period. This universal design allows a single component to replace what would traditionally require separate dedicated components for each function
3Area of stationary object
If high-frequency wireless signals are transmitted and received using the same antenna, then space efficiency is improved, but implementation complexity increases due to the need for rapid switching and signal processing
Solution Approach 1:
The patent introduces optical local oscillator signals as an intermediary mechanism to simplify the high-frequency signal processing. The optical signals illuminate the photodiode, which performs the frequency conversion and signal processing functions, reducing the complexity of direct electrical circuitry at frequencies greater than 100 GHz
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 allows for efficient use of space and resources by enabling the same antenna and optical signal path to transmit and receive extremely high-frequency wireless signals, supporting high data rates while minimizing space and resource consumption.
Implementation Method 1
The photodiode can be configured to generate, based on the first optical LO signal, the second optical LO signal, and a bias voltage applied to the photodiode, a current at a frequency greater than or equal to 100 GHz on the antenna radiating element
Implementation Method 2
An optical modulator such as a Mach-Zehnder modulator (MZM) may be interposed on the optical path. A digital-to-analog converter (DAC) may be coupled to the MZM over a transmit path. During signal transmission, the DAC may output wireless data onto the transmit path. The MZM may modulate the wireless data onto the second optical LO signal
Data Source
AI summary
An electronic device may include an antenna that conveys wireless signals at frequencies greater than 100 GHz. The antenna may include a radiating element coupled to a uni-travelling-carrier photodiode (UTC PD). An optical path may illuminate the UTC PD using a first optical local oscillator (LO) signal and a second optical LO signal. An optical phase shift may be applied to the first optical LO signal. A Mach-Zehnder modulator (MZM) may be interposed on the optical path. During signal transmission, the MZM may modulate wireless data onto the second optical LO signal while control circuitry applies a first bias voltage to the UTC PD. During signal reception, the control circuitry may apply a second bias voltage to the UTC PD that configures the UTC PD to convert received wireless signals into intermediate frequency signals and/or optical signals.