LCP Millimeter-Wave RF Structure for Low-Loss Signal Switching
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Solution Overview
Problem
Rigid printed circuit boards experience excessive signal loss and distortion at high-frequency millimeter wave frequencies, limiting their use in high-speed data transmission applications, while traditional flexible liquid-crystal polymer plates face challenges in maintaining signal integrity and reducing signal distortion.
Innovation Solution
A millimeter wave RF structure utilizing a liquid-crystal polymer substrate, dual-polarized antenna elements, a micro-electro-mechanical system (MEMS) switching module, and an RF gallium arsenide chip, with a Butler matrix and filter elements to enhance signal transmission and reduce size, incorporating a protective liquid-crystal polymer layer to minimize signal loss and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid printed circuit board is used for high-frequency signal transmission, then structural stability is improved, but signal loss increases significantly
Solution Approach 1:
The patent changes the material parameters by transitioning from rigid PCB to flexible LCP substrate, which has different dielectric properties (lower Dk and Df values) that reduce signal loss at millimeter wave frequencies while maintaining structural integrity through the flexible substrate's inherent stability
Solution Approach 2:
The patent employs a composite structure combining flexible LCP substrate with rigid support elements and specialized antenna designs, creating a hybrid system that achieves both flexibility for low signal loss and structural stability for mechanical support
2Productivity
If transmission speed and data volume are increased, then communication performance is improved, but signal distortion becomes increasingly serious
Solution Approach 1:
The patent optimizes material parameters by using LCP substrate with specifically controlled dielectric constant and dissipation factor, and adjusts geometric parameters of antenna elements and transmission lines to minimize signal distortion at high transmission speeds and millimeter wave frequencies
Solution Approach 2:
The patent introduces intermediary components such as matching networks, filtering elements, and impedance transformation structures that mediate between the high-speed signal source and antenna, reducing signal distortion by optimizing signal conditions at each stage of transmission
3Loss of energy
If a liquid-crystal polymer plate is used instead of rigid PCB, then signal loss is reduced and flexibility is improved, but maintaining signal integrity becomes more challenging
Solution Approach 1:
The patent carefully controls material parameters of the LCP substrate including dielectric constant, dissipation factor, and thickness, while optimizing geometric parameters of transmission lines and antenna elements to achieve low signal loss while maintaining signal integrity through proper impedance matching and reduced interference
Solution Approach 2:
The patent applies different local treatments and structures to different regions of the LCP substrate, such as specialized ground plane configurations, localized shielding, and region-specific impedance control, to maintain signal integrity in critical areas while preserving the overall flexibility and low-loss characteristics
Data Source
AI summary
A millimeter wave radio frequency (RF) structure uses a substrate including a liquid-crystal polymer material, at least one dual-polarized antenna, a RF transceiver module, and a switching module electrically connected to the at least one dual-polarized antenna and the RF transceiver module, where the switching module includes a first switching element and a second switching element electrically connected to the at least one dual-polarized antenna, and a third switching element electrically connected to the first switching element and the second switching element, to enhance characteristics of a liquid-crystal polymer (LCP) substrate for millimeter waves, and implement high-frequency, high-speed transmission while ensuring high reliability.