Single Quad-Mode Dielectric Resonator for Dual-Band Filtering Switch
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Solution Overview
Problem
Existing dual-band filtering switches for TDD communication systems are bulky and suffer from high losses due to the need for multiple resonators and diode-based ON-states, which introduce equivalent resistances and degrade transmission performance.
Innovation Solution
A dual-band filtering switch utilizing a single quad-mode dielectric resonator with a planar feeding structure and switching circuitry, minimizing the number of resonators and eliminating diode losses by simultaneously exciting or suppressing resonant modes for ON and OFF states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple single-band filtering switches are combined via duplex junctions or dual-band transformers to achieve dual-band operation, then dual-band functionality is achieved, but the device size becomes bulky and insertion loss increases
Solution Approach 1:
The patent merges two single-band filtering switch functions into a single integrated dual-band filtering switch by combining two resonators with different resonant frequencies (first resonator at first frequency, second resonator at second frequency) within one device structure, eliminating the need for separate switches and reducing overall size
Solution Approach 2:
The filtering switch is designed to perform multiple functions simultaneously - it operates as a passband switch at the first frequency and as a stopband switch at the second frequency, enabling dual-band operation with a single device rather than requiring multiple specialized components
2Ease of operation
If diodes are turned on to achieve ON-state in filtering switches, then switching functionality is achieved, but equivalent resistance losses are introduced into passbands degrading transmission performance
Solution Approach 1:
The patent inverts the conventional switching approach by using the complementarity between passband and stopband characteristics - when the first resonator is in passband (low loss), the second resonator is in stopband (high attenuation), and vice versa. This inversion strategy allows the switch to achieve ON-state without introducing diode resistance losses into the passband, as the lossy stopband of one resonator compensates for the passband of the other
3Ease of manufacture
If planar microstrip structures are used to design dual-band switches, then ease of manufacture is improved, but transmission losses are relatively large
Solution Approach 1:
The patent employs composite material structures by integrating resonators with specific dielectric properties and conducting materials to create a filtering switch that achieves low loss performance. The resonators are designed with optimized material compositions and structural configurations that reduce transmission losses while maintaining manufacturability through standard fabrication processes
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 solution achieves high performance in terms of insertion loss and isolation with a compact size, enabling efficient dual-band operation and easy integration for high-standard multi-band TDD communication systems.
Implementation Method 1
a single quad-mode dielectric resonator (DR) arranged in the shielding cavity
Implementation Method 2
the feeding structure includes two perpendicularly intersecting microstrip lines
Implementation Method 3
one end of each line of the two perpendicularly intersecting microstrip lines is respectively connected to a switching circuitry
Data Source
AI summary
A dual-band filtering switch based on a single quad-mode dielectric resonator (DR) includes: a first printed circuit board (PCB) provided thereon with an input terminal; a second PCB provided thereon with an output terminal; a shielding shell arranged between the first and second PCBs and enclosing a shielding cavity together with the first and second PCBs; and a single quad-mode DR arranged in the shielding cavity. The first and second PCBs each include a feeding layer, a dielectric layer, and a ground layer that are stacked in sequence. The feeding layers of the first and second PCBs each include a microstrip line and a switching circuitry connected to the microstrip line, and the feeding layer is in contact with a surface of the DR to realize a switching function of the filtering switch. The proposed filtering switch feature low loss transmission and high selectivity with dual-band operation, miniaturization with the fewest resonators and friendly-integration, simultaneously.