Dielectric Waveguide Filter Remote Harmonic Suppression
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Solution Overview
Problem
Dielectric waveguide filters in wireless communications devices suffer from poor remote harmonic suppression performance, requiring additional low-pass components that increase signal loss and assembly complexity.
Innovation Solution
A filter design incorporating a metal cavity, metal resonant cavity, and dielectric waveguide with a coupling structure that includes a dielectric body protruding into a communication area, reducing electromagnetic field strength and assembly precision requirements by utilizing the metal resonant cavity's frequency separation from the passband frequency to effectively suppress remote harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extra low-pass component is used to improve remote harmonic suppression performance, then the remote harmonic suppression performance is improved, but the signal loss increases and assembly complexity increases
Solution Approach 1:
The patent combines the low-pass suppression function with the existing dielectric waveguide structure by integrating a metal resonant cavity and coupling structure. This merging approach eliminates the need for separate extra low-pass components while achieving remote harmonic suppression, thereby avoiding additional signal loss and assembly complexity
Solution Approach 2:
The dielectric waveguide structure is designed to perform multiple functions simultaneously: it serves as both the main filtering element and the low-pass suppression element through its coupling with the metal resonant cavity. This multi-functionality removes the requirement for additional dedicated low-pass components
2Reliability
If an extra low-pass component is used to improve remote harmonic suppression performance, then the remote harmonic suppression performance is improved, but the assembly complexity increases
Solution Approach 1:
The patent merges the low-pass suppression functionality into the existing filter structure by using the coupling structure between the dielectric waveguide and metal resonant cavity. This integration reduces the number of separate components and simplifies assembly while achieving the desired remote harmonic suppression performance
3Manufacturing precision
If the dielectric body protrudes into the communication area to reduce electromagnetic field strength, then the assembly precision requirement is reduced, but the coupling efficiency may be affected
Solution Approach 1:
The patent changes the physical parameters of the coupling structure by having the dielectric body protrude into the communication area. This parameter change reduces the electromagnetic field strength in the coupling region, which in turn reduces the sensitivity to assembly precision while maintaining adequate coupling efficiency for the filter operation
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 enhances remote harmonic suppression without additional signal loss, simplifies assembly precision, and facilitates miniaturization of the filter, improving its applicability in wireless communications devices.
Implementation Method 1
the dielectric waveguide is coupled to the metal resonant cavity by using an electromagnetic field of a coupling connection area
Implementation Method 2
Because a frequency of a remote harmonic of a metal resonant cavity is farther away from a passband frequency, when the dielectric waveguide and the metal resonant cavity are jointly used, a remote harmonic of the entire filter can be effectively suppressed
Data Source
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AI summary
A filter and a communications device are disclosed. The filter includes a metal cavity, a metal resonant cavity, and a metal cover covering the metal cavity and the metal resonant cavity. A dielectric waveguide is disposed in the metal cavity, and the dielectric waveguide is electrically connected to the metal cavity. Resonant rod is disposed in the metal resonant cavity. A coupling structure is disposed between the metal cavity and a metal resonant cavity that is neighboring to the metal cavity, the coupling structure includes a communication area between the metal cavity and the metal resonant cavity and a dielectric body that protrudes into the communication area, the dielectric body is connected to the dielectric waveguide, and the coupling structure is coupled to a resonant rod in the metal resonant cavity. In the foregoing embodiment, because a frequency of a remote harmonic of a metal resonant cavity is farther away from a passband frequency, after the metal resonant cavity are used in the filter, a remote harmonic of the entire filter can be effectively suppressed.