Multiswitch Module for Multiband Mobile Radio Signal Routing
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Solution Overview
Problem
Existing multiband-multimode front ends for mobile communication devices face challenges in achieving a compact, cost-effective, and efficient connection architecture due to the need for simultaneous transmission and reception in WCDMA systems, which results in signal coupling and increased insertion loss.
Innovation Solution
A module with a central multiswitch that spatially separates transmission and reception branches, using matching elements for impedance matching and phase rotation, allowing for parallel connection of branches without conductor crossings, and enabling simultaneous operation of multiple mobile radio systems with different duplex methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the duplexer is arranged on the TX side to enable simultaneous transmission and reception in WCDMA, then transmission and reception can occur simultaneously, but feed lines become too long causing undesired signal coupling and increased insertion loss
Solution Approach 1:
The patent transitions from a planar arrangement where TX and RX paths cross to a three-dimensional module structure with vertically stacked layers. The multiswitch is positioned in the middle layer, with TX branches extending to one side and RX branches to the other, eliminating conductor crossings by utilizing the vertical dimension for routing separation.
Solution Approach 2:
The module is divided into functionally separate branches: TX branches for transmission and RX branches for reception. Each branch is independently routed from the multiswitch outputs, allowing optimized path lengths and impedance matching without interference from other signal paths.
2Adaptability or versatility
If multiple mobile radio systems are integrated in a single front end, then device functionality is enhanced, but architectural complexity increases making efficient connection difficult
Solution Approach 1:
The multiswitch serves as a universal connection element that handles multiple mobile radio systems (GSM, WCDMA, and future systems) through a single device. The module architecture accommodates different duplex methods (FDD and TDD) and frequency ranges, providing a unified platform for diverse communication standards without requiring separate front-end architectures.
Solution Approach 2:
The module employs electronically controllable switches that can dynamically reconfigure connections between antenna, TX branches, and RX branches based on the active communication standard and mode. This allows the same physical architecture to adapt to different operational requirements without manual reconfiguration.
3Manufacturing precision
If discrete components are used on the circuit board, then individual components can be optimized, but space consumption increases and compact connection becomes difficult
Solution Approach 1:
The patent combines multiple discrete components (multiswitch, filters, matching elements, and connection elements) into a single integrated module. The module housing contains all these elements in a compact arrangement, reducing the overall space required compared to distributing discrete components across the circuit board while maintaining individual component optimization.
Solution Approach 2:
The module structure implements a nested arrangement where smaller components (matching elements, filters) are positioned within the module housing around the central multiswitch. The feed lines are routed through the module interior, creating a compact nested configuration that minimizes external footprint while preserving internal component functionality.
Data Source
AI summary
A module for a mobile radio device is proposed, whose central element is a multiswitch MS, which, as desired, can connect outputs for transmission and/or reception branches SZ, EZ of different mobile radio systems to an antenna ANT. The module is suitable for a multiband operation and, optionally, additional multimode operations and includes at least one pair of outputs for transmission and reception branches of a frequency duplexed mobile radio system. Between each output of the multiswitch and the antenna, a matching element is provided, which allows an electrical matching of the branches to be connected to it. The duplex operation is carried out via separate transmission and reception filters, or on the switch via separate outputs for transmission and reception branches.