Dielectric Resonator Filter With Tuning Screws For Dual Mode Control
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Solution Overview
Problem
Existing dielectric resonator filters face challenges in efficiently supporting dual TM11 degenerate modes and adjusting resonance frequencies and coupling between them, which limits their performance in compact and high-Q applications such as space payloads and cellular base stations.
Innovation Solution
A dielectric resonator filter design featuring a metal housing with a dielectric rod short-circuited at both ends, equipped with adjustable screws for tuning resonance frequencies and coupling between dual degenerate modes, allowing for independent adjustment of resonance frequencies and coupling through the insertion depth of screws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual TM11 degenerate modes are supported in a dielectric resonator filter, then the filter performance and coupling adjustment capability are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The dielectric resonator is segmented by forming multiple holes through the dielectric rod, creating distinct regions that interact with the dual TM11 degenerate modes. Each hole can be independently tuned with screws, allowing separate control of resonance frequencies and coupling characteristics for each mode, thereby achieving complex filter performance through modular segmentation of the resonator structure.
Solution Approach 2:
The filter incorporates adjustable screws that can be dynamically positioned at different depths within the holes of the dielectric resonator. This dynamic adjustment capability allows real-time tuning of resonance frequencies and coupling between dual TM11 degenerate modes, enabling the filter to adapt to different performance requirements without redesigning the entire structure.
2Measurement precision
If multiple holes and apertures are formed in the dielectric rod for receiving tuning and coupling screws, then the adjustment precision of resonance frequencies is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The holes and apertures are pre-formed in the dielectric rod during the manufacturing process with predetermined positions and dimensions. This preliminary action establishes the structural framework before the actual tuning operation, allowing the screws to be inserted and adjusted later without requiring high-precision machining of the entire resonator. The pre-formed holes guide the screw positions, reducing the overall manufacturing precision requirements while maintaining tuning precision.
Solution Approach 2:
The screws act as intermediary elements between the manufacturer and the final filter performance. Instead of requiring the dielectric rod itself to have precise dimensions for frequency control, the screws serve as adjustable mediators that fine-tune the resonance frequencies. This intermediary approach transfers the precision requirement from the manufacturing stage to the tuning stage, where adjustable screws can achieve precise frequency control with simpler manufacturing processes.
3Reliability
If the dielectric rod is short-circuited at both ends within the metal housing, then the Q performance is improved, but the device complexity increases
Solution Approach 1:
The dielectric rod is merged with the metal housing by short-circuiting both ends of the dielectric rod to the housing walls. This merging creates a unified resonant structure where the dielectric rod and metal housing work together as a single system, improving the Q performance by eliminating unwanted parasitic effects at the boundaries. The combination of dielectric and conductive materials in one integrated structure achieves high Q without requiring separate complex matching networks.
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 effectively supports dual TM11 degenerate modes, enabling precise tuning of resonance frequencies and coupling, resulting in improved filter performance with adjustable transmission responses and spurious mode suppression, suitable for compact and high-Q applications.
Implementation Method 1
The dielectric resonator supports dual TM11 degenerate modes, each of which forms a resonant circuit
Implementation Method 2
an insertion depth of each of the screws is adjustable for adjusting resonance frequencies of the dual degenerate modes and coupling between the dual degenerate modes
Data Source
AI summary
A dielectric resonator filter and a method of manufacturing the same are disclosed. The dielectric resonator includes a metal housing having a top surface and a bottom surface and defining a resonator cavity, and a dielectric rod located within the resonator cavity. The dielectric rod is short-circuited at both the top surface and the bottom surface. A plurality of holes are formed in the dielectric rod parallel to an axis of the dielectric rod and a plurality of apertures are formed on the top surface corresponding to the positions of the holes, respectively. A plurality of screws are inserted into the holes through the apertures, respectively. The dielectric resonator supports dual TM11 degenerate modes, each of which forms a resonant circuit. An insertion depth and a dimension of each of the screws is adjustable to adjust resonance frequencies of the dual degenerate modes and coupling between the dual degenerate modes.