Duplexer Ring Electrode Isolation Design
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Solution Overview
Problem
The challenge is to reduce the size of duplexers in mobile communication terminals while maintaining sufficient isolation between transmission and reception terminals, as existing techniques either require large distances between components or degrade isolation due to the proximity of filters in a single package.
Innovation Solution
A duplexer design featuring an insulation substrate with a ring-shaped electrode and via interconnections that connect the ring-shaped electrode to ground foot pads, improving isolation by reducing the electric current flowing through the ring-shaped electrode and minimizing magnetic and electrostatic coupling between the transmission and reception pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If filters are mounted in a single package to reduce size, then the duplexer size is reduced, but isolation between transmission and reception terminals degrades
Solution Approach 1:
A ring-shaped electrode is introduced as an intermediary element between the transmission pad and reception pad. This electrode acts as a mediator to control and reduce electromagnetic coupling between the transmission and reception terminals, thereby improving isolation while maintaining the compact single-package structure.
Solution Approach 2:
The invention modifies the electromagnetic field distribution by introducing the ring-shaped electrode with specific geometric parameters (radius, width, position). By adjusting these parameters, the coupling between transmission and reception pads is controlled, achieving improved isolation without increasing the overall duplexer size.
2Reliability
If ground pattern is provided for partition between interconnections, then isolation is improved, but large distance between interconnection and ground pattern is required
Solution Approach 1:
The invention changes the configuration parameter of the grounding structure from a conventional ground pattern to a ring-shaped electrode. This parameter change allows the grounding function to be achieved with a more compact layout, reducing the required distance between interconnections while maintaining or improving isolation performance.
3Reliability
If ring-shaped electrode is used to improve isolation, then isolation between transmission and reception terminals is enhanced, but device complexity increases
Solution Approach 1:
The ring-shaped electrode serves multiple functions simultaneously: it acts as a grounding element, an electromagnetic shielding structure, and a coupling control element. By combining multiple functions into a single component, the invention achieves improved isolation without proportionally increasing device complexity.
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 the isolation between the transmission and reception terminals, effectively suppressing signal leakage and maintaining high hermetic sealing, even in a compact form factor.
Implementation Method 1
a ring-shaped electrode provided on the upper surface and configured to surround the transmission pad and the reception pad; a via interconnection configured to electrically interconnect the ring-shaped electrode and the ground foot pad
Implementation Method 2
a via interconnection configured to electrically interconnect the ring-shaped electrode and the ground foot pad
Data Source
AI summary
A duplexer includes: an insulation substrate having an upper surface on which a transmission filter and a reception filter are mounted, and a lower surface on which a foot pad layer electrically connected to the transmission filter and the reception filter is formed; a transmission pad provided on the upper surface and electrically connected to the transmission filter; a reception pad provided on the upper surface and electrically connected to the reception filter, a ring-shaped electrode provided on the upper surface and configured to surround the transmission pad and the reception pad; a ground foot pad included in the foot pad layer, and a via interconnection configured to electrically interconnect the ring-shaped electrode and the ground foot pad and to be provided in the ring-shaped electrode in a section along a shorter one of routes that connect the transmission pad and the reception pad to each other along the ring-shaped electrode.