Adjustable Electromagnetic Band Gap Structure for Frequency Tuning
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Solution Overview
Problem
Existing electromagnetic band gap (EBG) structures in electronic circuits are difficult to miniaturize and have non-adjustable cut-off frequencies, leading to increased manufacturing costs and suboptimal frequency characteristics.
Innovation Solution
An EBG structure is created by adding a second conductor electromagnetically coupled to the ground conductor and conductor plates on a substrate, allowing for adjustable cut-off frequencies without increasing the size of the conductor plates, using additional conductors that can be detachably connected to change the resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the unit element size is increased to lower the cut-off frequency, then the cut-off frequency is reduced, but the size of the EBG structure increases
Solution Approach 1:
The patent applies dynamics by making the EBG structure adjustable through movable conductors. The second conductor can be positioned at different distances from the first conductor, allowing the cut-off frequency to be dynamically adjusted without changing the physical size of the structure. This resolves the contradiction by enabling frequency tuning while maintaining a compact form factor.
Solution Approach 2:
The patent changes the parameter of conductor spacing to adjust the cut-off frequency. By varying the distance between the first and second conductors, the electromagnetic coupling changes, which directly affects the resonant frequency and cut-off frequency of the EBG structure. This allows frequency adjustment without increasing the overall structure size.
2Volume of moving object
If multiple chip inductors or chip capacitors are used to reduce the size of the EBG structure, then the size is reduced, but the number of electronic components increases leading to increased manufacturing cost
Solution Approach 1:
The patent merges the functions of multiple discrete components into an integrated planar structure. The EBG structure is formed by patterned conductors on a substrate, combining what would traditionally require separate inductors and capacitors into a unified design. This reduces the number of discrete components while maintaining the size-reduction benefit, thereby lowering manufacturing cost.
Solution Approach 2:
The patent replaces discrete mechanical components (chip inductors and capacitors) with an electromagnetic field-based planar structure. The inductive and capacitive effects are achieved through the geometry and arrangement of conductors on the substrate rather than through separate physical components, simplifying manufacturing and reducing costs.
3Volume of moving object
If multiple chip inductors or chip capacitors are used to reduce the size of the EBG structure, then the size is reduced, but difficulty in obtaining desired cut-off frequency arises due to electronic components having frequency characteristics rather than ideal characteristics
Solution Approach 1:
The patent uses geometric parameters of the conductor patterns (spacing, area, shape) to precisely control the electromagnetic characteristics. By adjusting the distance between conductors and their dimensions, the cut-off frequency can be accurately tuned without relying on discrete components with fixed frequency characteristics. This provides better control and precision in achieving the desired cut-off frequency.
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 configuration enables a compact EBG structure with adjustable cut-off frequencies, reducing manufacturing costs and improving frequency characteristics by allowing for flexible tuning of the resonance frequency without altering the size of the conductor plates.
Implementation Method 1
a second conductor that is arranged at a distance from and rearward of the plurality of conductor plates in a view from the second surface of the substrate, is connected to the ground conductor, and is electromagnetically coupled to at least a portion of the plurality of conductor plates
Implementation Method 2
a substrate having an electromagnetic band gap structure formed including a ground conductor and a first conductor that includes a plurality of conductor plates
Data Source
AI summary
An electronic circuit includes: a substrate having an electromagnetic band gap structure formed including a ground conductor and a first conductor that includes multiple conductor plates, the conductor plates being arranged on a first surface, and at least a portion of the ground conductor being arranged on a second surface; and a second conductor that is arranged at a distance from and rearward of the conductor plates in a view from the second surface of the substrate, is connected to the ground conductor, and is electromagnetically coupled to at least a portion of the conductor plates.