Reconfigurable Differential Antenna Circuit for Low-Loss mmWave Switching
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Solution Overview
Problem
Existing antenna systems for 5G devices face challenges in achieving optimal performance, size, and manufacturability, particularly at millimeter wave frequencies, where power loss occurs due to on-resistor and off-capacitance in switch transistors.
Innovation Solution
The proposed antenna system incorporates a transformer-based design with multiple windings and switches, allowing for selective coupling of transceivers and antennas, and embedding switches within matching transmission line transformers to reduce chip size and insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared transmitter with antenna switching network is used to lower costs, then device complexity is reduced, but power loss increases due to on-resistor and off-capacitance in switch transistors at millimeter wave frequencies
Solution Approach 1:
The patent introduces transmission line transformers as intermediary components between the shared transmitter and antenna elements. These transformers provide galvanic isolation and impedance transformation, eliminating the need for traditional switch transistors in the signal path. The transformer-based switching network uses magnetic coupling to route signals between antennas without direct electrical contact, thereby eliminating on-resistor and off-capacitance losses while maintaining the shared transmitter architecture.
2Device complexity
If traditional antenna switching networks are used, then device complexity is reduced, but insertion loss increases at millimeter wave frequencies
Solution Approach 1:
The patent replaces the mechanical/electronic switching mechanism (switch transistors) with a magnetic field-based transformation mechanism (transmission line transformers). This substitution eliminates the physical contacts and junctions that cause insertion loss, using electromagnetic induction through transformer windings to achieve signal routing with minimal loss at millimeter wave frequencies.
3Reliability
If separate transmitters are used to drive different antennas, then performance is improved, but device complexity and chip size increase
Solution Approach 1:
The patent makes a single transmitter universal by enabling it to drive multiple antenna elements through the transformer-based switching network. The shared transmitter can selectively couple to different antennas via the transformer matrix, providing multi-functionality without requiring separate transmitters for each antenna. This reduces chip space and device complexity while maintaining the performance benefits of multiple driven antennas.
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 achieves efficient and compact antenna switching, reduces power loss, and enhances performance across multiple frequency bands, supporting advanced wireless communication applications like 5G.
Implementation Method 1
The first transformer includes a primary winding, and a secondary winding... The antenna is coupled to the first terminal and the second terminal of the secondary winding of the first transformer
Data Source
AI summary
An antenna system includes a first transformer, a first transceiver, a first switch, a second switch and an antenna. The first transformer includes a primary winding, and a secondary winding. The primary winding includes a first terminal and a second terminal, and the secondary winding includes a first terminal and a second terminal. The first transceiver is coupled to the first terminal of the primary winding of the first transformer. The first switch is coupled between the first terminal of the secondary winding of the first transformer and a ground. The second switch is coupled between the second terminal of the secondary winding of the first transformer and the ground. The antenna is coupled to the first terminal and the second terminal of the secondary winding of the first transformer. The antenna is a differential antenna.