Waveguide Band-Pass Filter for 28GHz Signal Transmission
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Solution Overview
Problem
Conventional microstrip-line filters in transmitter modules have high insertion loss and are sensitive to manufacturing variations, compromising communication quality and stability.
Innovation Solution
A band-pass filter device utilizing a waveguide filter with a high-pass and low-pass portion, configured to remove electromagnetic waves outside a specific frequency band, reducing insertion loss and manufacturing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a microstrip-line filter is used to remove undesired signal frequencies, then the filter structure is simple and easy to manufacture, but the insertion loss is high (3dB to 7dB) and the filter is very sensitive to manufacturing process variations
Solution Approach 1:
The patent changes the fundamental operating parameters of the filter by transitioning from microstrip-line technology to waveguide technology. This parameter change enables the filter to operate with minimal insertion loss while maintaining ease of manufacture through standardized waveguide components and assembly processes.
Solution Approach 2:
The patent replaces the planar microstrip-line mechanical structure with a three-dimensional waveguide structure. This substitution eliminates the inherent limitations of microstrip filters, providing superior signal transmission characteristics while maintaining manufacturing feasibility through modular waveguide assembly.
2Ease of manufacture
If a microstrip-line filter is used to remove undesired signal frequencies, then the filter can be easily manufactured, but even minor manufacturing errors cause significant shifts in the operation frequency band
Solution Approach 1:
The patent changes the dimensional parameters and structural characteristics of the filter from two-dimensional microstrip lines to three-dimensional waveguides. This parameter change makes the filter performance less sensitive to minor manufacturing variations, as waveguide dimensions can be more easily controlled and adjusted during assembly to achieve precise frequency band alignment.
Solution Approach 2:
The patent divides the filter into modular waveguide sections that can be independently manufactured and then assembled. This segmentation allows for easier quality control and frequency tuning, as each module can be optimized separately and adjustments can be made during assembly without affecting the entire filter structure.
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 waveguide filter achieves minimal insertion loss and improved signal quality by selectively removing frequencies outside the 28GHz to 30.5GHz band, enhancing communication stability and design flexibility.
Implementation Method 1
The waveguide filter includes a waveguide chamber. The waveguide chamber includes a high-pass portion, a connection portion, and a low-pass portion.
Implementation Method 2
The high-pass portion of the waveguide filter may be configured to remove electromagnetic waves whose frequency is lower than 28GHz.
Implementation Method 3
The low-pass portion of the waveguide filter may be configured to remove electromagnetic waves whose frequency is higher than 30.5GHz.
Implementation Method 4
The first antenna may convert the first wired signal into the wireless signal
Implementation Method 5
the second antenna may convert the wireless signal into the second wired signal
Data Source
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AI summary
A band-pass filter device includes a waveguide filter, a first circuit board section, a first antenna, a second circuit board section, and a second antenna. The waveguide filter includes a high-pass portion, a connection portion, and a low-pass portion. The first antenna is disposed on the first circuit board section. The second antenna is disposed on the second circuit board section. A wireless signal generated by the first antenna is transmitted through the high-pass portion, the connection portion, and the low-pass portion of the waveguide filter, and then is received by the second antenna.