PCB Current Breaker Layout for Compact Antenna Decoupling
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Solution Overview
Problem
Conventional current breakers in microwave circuits require large areas due to their quarter-wavelength size, leading to impractical designs that fail to effectively reduce higher order resonance frequencies and minimize component size, while parallel LC resonant circuits for decoupling between antennas occupy excessive space.
Innovation Solution
A multilayer printed circuit board design incorporating a ground plane with a slot forming inductive impedance and a metal component creating capacitive impedance, connected by a conductive via hole, forming a parallel LC equivalent circuit that acts as an open circuit at resonant frequencies to block current flow along the ground plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional quarter-wavelength current breaker is used to reduce higher order resonance frequency and increase impedance bandwidth, then the antenna operates in broad bandwidth, but the component size becomes too large (roughly equal to quarter wavelength)
Solution Approach 1:
The patent transitions from a planar current breaker design to a three-dimensional structure by stacking multiple ground plane layers (first ground plane, second ground plane) separated by a dielectric layer. This vertical dimensionality change allows the current breaker to achieve the required electrical length and bandwidth performance while occupying less horizontal area on the substrate.
Solution Approach 2:
The patent embeds the current breaker structure within the layered architecture of the antenna system. The first and second ground planes are nested between the substrate and the radiating element, with the dielectric layer nested between the ground planes. This nesting allows the current breaker to be integrated into the existing antenna structure without requiring additional external space.
2Object-affected harmful factors
If a parallel LC resonant circuit with slots and vertical traces is used to block current between antennas, then coupling between antennas is reduced, but the occupied area becomes too large
Solution Approach 1:
The patent uses the vertical separation between the first and second ground planes to create the LC resonant circuit. The slots in the first ground plane and the corresponding slots in the second ground plane are aligned vertically, creating a compact three-dimensional LC circuit structure that blocks mutual coupling without requiring large horizontal area.
Solution Approach 2:
The patent combines conductive materials (ground planes with slots) and dielectric materials (substrate and dielectric layer) to form a composite LC resonant circuit structure. This composite approach allows the circuit to achieve the required electrical characteristics while maintaining a compact physical footprint.
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 effectively reduces the impact of current on the antenna by blocking current flow along the ground plane, allowing for a more compact wireless communication device with improved impedance bandwidth and radiation patterns without increasing the size of the ground plane.
Implementation Method 1
The ground plane comprises a slot, which is used for forming an inductive impedance
Implementation Method 2
a capacitive impedance is formed between the metal component and the ground plane
Implementation Method 3
The inductive impedance formed by the slot and the capacitive impedance formed between the metal component and the ground plane together create a parallel LC equivalent circuit... acts as an open circuit at a resonant frequency
Data Source
AI summary
A current breaker comprises a multi-layer printed circuit board (PCB), a ground plane, a metal component and a conductive via hole. The ground plane is disposed in a first metal layer of the multi-layer PCB and comprises a slot forming inductive impedance. The slot comprises an extended portion. The metal component is disposed in a second metal layer of the multi-layer PCB. Capacitive impedance is formed between the metal component and the ground plane. The projection of the metal component on the ground plane and the extended portion of the slot partially overlap. The conductive via hole penetrates the multi-layer PCB to connect metal component with the ground plane. The first and the second metal layers are any two metal layers of the multi-layer PCB. The inductive impedance formed by the slot and the capacitive impedance formed between the metal component and the ground plane create a parallel LC equivalent circuit.