Dual Mode Filter Parallel Conductor Sections
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Solution Overview
Problem
Conventional dual mode filters face challenges in minimizing their size due to insertion losses and surface area requirements, particularly in microwave systems where compactness is crucial.
Innovation Solution
A dual mode filter design featuring a longer conductor with sections arranged in parallel and vias for coupling, along with additional conductors for capacitive coupling, reduces the filter's size by optimizing current flow and dielectric constants, allowing for a smaller footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional dual mode filters use meandering conductor design to shrink substrate area, then the total area is reduced, but insertion losses increase
Solution Approach 1:
The first conductor is divided into multiple parallel sections instead of using a meandering single conductor. This segmentation allows the conductor to achieve the required electrical length without excessive physical area, while the parallel configuration reduces current density and associated losses compared to tight meandering paths.
Solution Approach 2:
The conductor sections are arranged in parallel spatial configuration rather than sequential meandering. This dimensional reorganization allows the filter to achieve compact area while maintaining lower insertion losses by distributing current across multiple parallel paths instead of forcing it through a single meandering path.
2Length of moving object
If conventional dual mode filters use meandering conductor design, then the current path is extended to achieve resonance, but the surface area necessary for the filter increases
Solution Approach 1:
Multiple parallel conductor sections are combined to form the first conductor, achieving the required effective electrical length through parallel configuration rather than sequential meandering. This merging of parallel paths provides the necessary resonance length while occupying less surface area than a single meandering conductor would require.
3Area of stationary object
If the first conductor is arranged with parallel sections, then the filter size is reduced, but the current distribution becomes more complex
Solution Approach 1:
The parallel sections are positioned and dimensioned to create specific local coupling characteristics. By carefully designing the spacing and length of individual parallel sections, the current distribution is optimized to achieve the desired resonance and coupling effects while maintaining compact filter size.
Solution Approach 2:
The parallel conductor sections act as intermediaries that facilitate controlled coupling between the input and output ports. The specific arrangement of parallel sections provides the necessary impedance transformation and coupling without requiring complex additional components, thereby reducing overall filter size while managing current distribution.
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
The design achieves a smaller size and reduced insertion losses, maintaining good input matching and flat group delay within the pass band, while allowing for tunable center frequency and bandwidth.
Implementation Method 1
two orthogonal modes occur at a resonator frequency
Implementation Method 2
a coupling is obtained which enables the size of the dual mode filter to be reduced
Implementation Method 3
sections are arranged so that the current in the two most adjacent parallel sections always flows in the same direction
Data Source
AI summary
A dual mode filter (200, 500, 900) comprising an input (Pin) and an output port (Pout) and a non-conducting substrate (205, 505), and first (215, 510, 902) and second (210, 540, 901) conductors which connect the input port to the output port. The conductors are arranged on or in the substrate, and the first conductor is longer than the second conductor by 50%. Either the first or the second conductor comprises a perturbation element (208, 530, 915) at a central position. The first conductor is arranged between the input port and the output port with a number of sections (216-222; 511-519; 931-933, 936-938), at least some of which are parallel to each other, and arranged so that the current in a section which has one or more other sections in parallel to it always flows in the same direction as the current in the most adjacent of said other sections.