High-Frequency Module Phase Adjustment via Transmission Line Lengths
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Solution Overview
Problem
Existing high-frequency modules face increased transmission loss and module size due to the need for multiple phase adjustment circuits for different frequency bands, which complicates design and degrades isolation between adjacent circuits.
Innovation Solution
A high-frequency module design that uses a diplexer, switch element, and two filter elements, with transmission lines of different lengths to adjust reflection phases, reducing the number of components and module size while improving isolation and reducing transmission loss across multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If phase adjustment circuits are provided for each filter element to compensate for different phase characteristics, then transmission loss is reduced, but device complexity increases and module size is increased
Solution Approach 1:
The patent merges the phase adjustment function into the transmission lines themselves rather than using separate phase adjustment circuits. By designing transmission lines with specific lengths (L1 and L2) that inherently provide the required phase adjustment, the patent eliminates additional phase adjustment circuits while still achieving proper phase compensation for signals passing through different filter elements.
Solution Approach 2:
The transmission lines serve multiple functions: they connect the switch element to the filter elements while simultaneously providing phase adjustment for different frequency bands. This multi-functional design eliminates the need for dedicated phase adjustment circuits, reducing overall device complexity while maintaining transmission performance.
2Reliability
If multiple phase adjustment circuits are provided for different frequency bands, then signal passage characteristics are maintained, but module size is increased
Solution Approach 1:
The patent combines the phase adjustment functionality into the transmission line structures themselves. By setting specific lengths for transmission lines L1 and L2, the patent achieves phase compensation for multiple frequency bands without requiring separate phase adjustment circuits, thereby maintaining passage characteristics while minimizing module size.
3Volume of stationary object
If elements defining phase adjustment circuits are positioned close to each other to reduce module size, then isolation between adjacent circuits is degraded
Solution Approach 1:
The patent extracts the phase adjustment function from separate circuits and integrates it into the transmission line structures. This eliminates the need for distinct phase adjustment circuit elements that would require spatial separation, allowing compact element positioning without compromising isolation between different frequency band circuits.
4Adaptability or versatility
If filter elements are used for each frequency band with different phase characteristics, then frequency-specific filtering is achieved, but design of phase adjustment circuits becomes difficult
Solution Approach 1:
The patent uses parameter changes in the transmission line lengths (L1 and L2) to achieve phase adjustment for different frequency bands. By varying the physical length parameters of the transmission lines, the patent compensates for different phase characteristics of filter elements across multiple frequency bands, simplifying the overall design while maintaining frequency-specific filtering capabilities.
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 design achieves reduced transmission loss and improved passage characteristics for communication signals across different frequency bands using a simple structure and small size, enabling efficient signal switching with one antenna.
Implementation Method 1
a diplexer, a switch element, a first filter element, and a second filter element. The diplexer separates a communication signal in a first frequency band, a communication signal in a second frequency band, and a communication signal in a third frequency band
Implementation Method 2
a line length of a first transmission line connecting the switch element and the first filter element is preferably greater than a line length of a second transmission line connecting the switch element and the second filter element
Data Source
AI summary
A high-frequency switch module includes a first diplexer arranged to receive a GPS signal and to send/receive a GSM 1800 communication signal and a GSM 1900 communication signal, and a switch element arranged to switch between the sending/receiving of the GSM 1800 and the sending/receiving of the GSM 1900 communication signal. A SAW filter having a passage band corresponding to the frequency band of the GSM 1900 communication signal and a SAW filter having a passage band corresponding to the frequency band of the GSM 1800 communication signal are connected to the switch element. A line length of a transmission line for connection to the SAW filter which provides a reflection phase closer to the open side for the GPS signal as viewed from the switch element is greater than that of a transmission line for connection to the other SAW filter.