Multi-Port Driven Antenna for Millimeter-Wave Loss Reduction
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Solution Overview
Problem
Traditional antennas face challenges in efficiently radiating power at millimeter-wave frequencies due to impedance matching issues, lossy transmission lines, and the need for off-chip power transfer, which limits their effectiveness in integrated chip designs.
Innovation Solution
A multi-port driven antenna design that incorporates multiple input ports with specific phase relationships and a ground contact point, allowing for efficient radiation and impedance matching directly on the chip, reducing losses and enabling integrated power generation and radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional single-port antenna design is used, then impedance matching is simplified, but radiation efficiency deteriorates due to lossy transmission lines and off-chip power transfer requirements
Solution Approach 1:
The antenna is driven by multiple independent ports instead of a single port, with each port connected to a separate amplifier. This segmentation allows direct on-chip power generation and radiation without requiring lossy off-chip transmission lines, eliminating the need for bonding wires and solder bumps while maintaining radiation efficiency
Solution Approach 2:
The patent combines multiple amplifier outputs directly to the antenna structure, merging power generation and radiation functions into a single integrated system. This eliminates the need for separate impedance matching networks and transmission lines, reducing overall system loss
2Loss of energy
If off-chip antenna connection is used, then antenna radiation capability is improved, but power transfer efficiency deteriorates due to bonding wire and solder bump losses
Solution Approach 1:
The patent extracts the antenna radiation function and integrates it directly onto the chip, eliminating the need for external antenna connections through bonding wires and solder bumps. The antenna structure is fabricated using standard CMOS processes, allowing direct on-chip power generation and radiation without external interconnects
Solution Approach 2:
The patent introduces an intermediate integrated antenna structure that serves as a mediator between the on-chip amplifiers and free-space radiation. This intermediate structure enables direct power transfer from chip to radiation without requiring external connections, eliminating the lossy bonding wire and solder bump interface
3Power
If large transistors are used for high power generation, then power output is improved, but load impedance requirements deteriorate due to low breakdown voltages
Solution Approach 1:
The patent segments the power generation function across multiple amplifier stages, each with manageable transistor sizes and impedance requirements. Each amplifier drives a separate antenna port, allowing the use of smaller transistors with higher breakdown voltages while achieving high total power output through parallel operation
Solution Approach 2:
The patent optimizes the impedance characteristics at each individual amplifier output to match the local antenna input impedance, rather than requiring a single global impedance match. This allows each amplifier-transistor pair to operate at its optimal power point with appropriate local impedance transformation
4Reliability
If impedance matching networks are used, then impedance matching is improved, but system loss increases due to network insertion loss
Solution Approach 1:
The patent extracts the impedance matching function from separate external networks and integrates it directly into the amplifier output stages and antenna input structures. This eliminates the need for discrete impedance matching networks that would introduce additional insertion loss
Solution Approach 2:
The patent merges the impedance matching function with the amplifier and antenna structures themselves, rather than using separate matching networks. The amplifier output impedance and antenna input impedance are directly optimized for matching, eliminating intermediate lossy components
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 design enhances radiation efficiency, eliminates the need for external antennas, and integrates power combining and impedance matching, achieving high power transfer and efficient radiation patterns, particularly suitable for silicon-based integrated circuits at millimeter-wave frequencies.
Implementation Method 1
an antenna structure having a length L, the antenna structure comprising a conductor and configured to radiate electromagnetic radiation
Data Source
AI summary
An integrated Multi-Port Driven (MPD) antenna that can be driven at many points with different signals. An integrated MPD radiating source utilizing an 8-phase ring oscillator and eight power amplifiers to drive the MPD antenna at 161 GHz with a total radiated power of −2 dBm and a single element EIRP of 4.6 dBm has been demonstrated in silicon with single lobe well behaved radiation patterns closely matching simulation.