T-Shaped Ring Resonator Duplexer for High-Isolation mm-Wave Bands
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Solution Overview
Problem
Current duplexer designs for 5G/6G systems face challenges in achieving small size, low power consumption, and high isolation on-chip, particularly for mm-wave and THz applications, due to limitations in existing CMOS technologies which result in large chip sizes and reliability issues.
Innovation Solution
The development of ring resonator and stub resonator based T-shaped duplexer designs using microstrip structures with Electromagnetically Induced Transparency (EIT) windows, allowing signal passage at pre-tuned frequency bands, and employing Fano and Lorentzian resonances to achieve high selectivity and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional CMOS technology is used for duplexer design, then manufacturing ease is improved, but chip size becomes large and reliability deteriorates
Solution Approach 1:
The patent changes the operating frequency parameter to mm-wave and THz ranges, which fundamentally alters the duplexer design requirements. This enables the use of resonator-based structures with higher Q-factors that achieve better isolation and smaller size while maintaining CMOS compatibility, thus resolving the contradiction between manufacturing ease and reliability
Solution Approach 2:
The patent transitions from planar microstrip resonators to three-dimensional cavity resonator structures. This dimensional change enables higher frequency operation and better isolation performance in a compact volume, achieving both small size and high reliability while remaining manufacturable in advanced CMOS processes
2Device complexity
If conventional duplexer designs are used, then device complexity is reduced, but isolation and selectivity deteriorate
Solution Approach 1:
The patent employs resonator structures that exploit electromagnetic resonance at specific frequencies. By designing resonators with precise resonant frequencies for transmit and receive bands, the system achieves high isolation through resonant coupling and decoupling mechanisms, maintaining relatively simple device architecture while dramatically improving isolation performance
3Device complexity
If conventional duplexer designs are used, then device complexity is reduced, but size becomes large
Solution Approach 1:
By operating in mm-wave and THz frequency ranges, the patent enables the use of electrically small resonator dimensions. The wavelength at these frequencies is much shorter, allowing resonators to be miniaturized while maintaining their Q-factor and filtering performance, thus achieving compact duplexer designs without excessive complexity
Solution Approach 2:
The transition to three-dimensional cavity resonators allows vertical integration and compact volumetric packaging. This enables high Q-factors and good isolation in a small footprint by utilizing the third dimension for field confinement, reducing the overall chip size while maintaining performance and avoiding complex planar structures
4Use of energy by stationary object
If conventional duplexer designs are used, then power consumption is not optimized, but isolation deteriorates
Solution Approach 1:
The resonator-based design exploits high-Q electromagnetic resonance to achieve strong signal filtering with minimal energy dissipation. The resonant structures store and release energy efficiently at the operating frequencies, providing high isolation between transmit and receive paths while consuming minimal power, unlike active filtering approaches
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
These designs enable compact, high-selectivity, and low-insertion-loss duplexers suitable for 5G/6G systems, with scalable frequency ranges from 28-32 GHz to 300 GHz, addressing the need for smaller form factors and improved performance in massive MIMO configurations.
Implementation Method 1
each ring resonator structure creates an Electromagnetically Induced Transparency (EIT) window within a frequency absorption region of the bandpass filter to allow a signal to pass at a pre-tuned frequency band
Implementation Method 2
employing Fano and Lorentzian resonances to achieve high selectivity and isolation
Implementation Method 3
employing Fano and Lorentzian resonances to achieve high selectivity and isolation
Data Source
AI summary
A ring resonator based T-shaped duplexer for use in communication systems, the T-shaped duplexer comprising a T-shaped microstrip duplexer body having a first rectangular-shaped body section and a second rectangular-shaped body section that extends from the first-rectangular shaped section in a perpendicular position relative to the first rectangular-shaped section, three connection ports including a first connection port disposed at an open end of the second rectangular-shaped body section, a second connection port disposed at one end of the first rectangular-shaped body section, and a third connection port disposed at another end of the first rectangular-shaped body section, and two bandpass filters, each bandpass filter comprising a ring resonator structure having a circular shape, an outer edge of the ring resonator structure being connected to the first rectangular-shaped body section of the T-shaped microstrip duplexer body, wherein each of the two bandpass filters creates an Electromagnetically Induced Transparency (EIT) window within a frequency absorption region of the bandpass filter to allow a signal to pass at a pre-tuned frequency band.