Wide-band Coupler for Multi-band Mobile Antennas
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Solution Overview
Problem
The increasing number of frequency bands processed by mobile telecommunications devices leads to parasitic coupling between antennas, causing disturbances and making it difficult for conventional couplers to accurately extract power for measurement, especially when frequency bands overlap, resulting in inefficiencies and increased bulk due to the need for multiple couplers.
Innovation Solution
A wide-band coupler design featuring a single distributed coupler with two-output signal splitters, each equipped with low-pass and correction filters, allowing signals to be processed by a common antenna across multiple frequency bands with reduced transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional couplers are used to extract power for measurement in multi-frequency band devices, then power extraction is achieved, but parasitic coupling between antennas causes measurement inaccuracies and requires multiple separate couplers
Solution Approach 1:
The patent combines multiple frequency band processing capabilities into a single coupler structure. The coupler includes a first coupled line and a second coupled line with different characteristic impedances, allowing it to handle multiple frequency bands simultaneously without requiring separate couplers for each band, thus reducing device complexity while maintaining measurement precision
Solution Approach 2:
The coupler is designed with universal functionality to operate across multiple frequency bands. By configuring the first and second coupled lines with specific impedance values, the coupler can process signals from different frequency bands through a single antenna, eliminating the need for multiple dedicated couplers and reducing parasitic coupling between separate antenna paths
2Adaptability or versatility
If multiple separate couplers are used for different frequency bands, then each band can be processed independently, but the device becomes bulkier and more complex
Solution Approach 1:
The patent merges the functionality of multiple frequency band couplers into a single integrated structure. The first coupled line and second coupled line are positioned adjacently and share common space, allowing the device to process multiple frequency bands without increasing physical volume, thus resolving the contradiction between versatility and compactness
3Volume of moving object
If a single antenna is used for multiple frequency bands, then device compactness is improved, but parasitic coupling between bands causes signal interference
Solution Approach 1:
The patent applies local quality differentiation by configuring the first coupled line and second coupled line with different characteristic impedances. This local variation in impedance characteristics allows each line to be optimized for specific frequency ranges, enabling a single antenna to serve multiple bands while minimizing parasitic coupling through targeted impedance matching in different sections of the coupler
Solution Approach 2:
The patent utilizes parameter changes in the coupled line characteristics to mitigate parasitic coupling. By adjusting the characteristic impedances of the first and second coupled lines to specific values, the coupler can process multiple frequency bands with a single antenna while reducing interference, thus achieving both compactness and reduced parasitic effects
Data Source
AI summary
A coupling circuit, including: a coupler including a first conductive line and a second conductive line coupled to the first one; at each end of the second line of the coupler, a two-output signal splitter; and at each output of each splitter, a filtering function.