Single Antenna Multi-Band Frequency Division Multiplexing Filter
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Solution Overview
Problem
The proliferation of wireless communication services across various frequency bands has led to crowded and intermingled frequency spectrums, making it costly and impractical to use a single antenna for multiple radios, as high-cost duplexers are required to isolate these bands effectively.
Innovation Solution
A frequency division multiplexing device utilizing a multiplexer with band-pass and band-stop filters, along with receive and transmit filters, allows simultaneous communication with two transceivers via a single antenna, enabling the use of intermingled frequency bands by attenuating signals outside specific bands and allowing signals within the pass-band to pass unattenuated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single antenna is used for multiple radios operating on different frequency bands, then device cost and complexity are reduced, but effective signal isolation between intermingled frequency bands becomes prohibitively expensive or unfeasible
Solution Approach 1:
The frequency spectrum is segmented into distinct pass-bands and stop-bands using multiple band-pass and band-stop filters. Each filter targets specific frequency ranges, dividing the complex multi-band signal isolation problem into manageable frequency segments that can be handled individually by dedicated filter components.
Solution Approach 2:
Different filter components are assigned specific frequency isolation responsibilities based on their local frequency characteristics. Band-pass filters are configured for specific transmit and receive bands, while band-stop filters target specific intermingled frequency ranges, allowing each filter to optimize its performance for its designated frequency region.
2Reliability
If multiple antennas are used to support multiple radios on different frequency bands, then signal isolation between bands is improved, but device cost and physical size increase
Solution Approach 1:
Multiple filter components (band-pass filters and band-stop filters) are merged into a single integrated filter system that processes all frequency bands through one antenna. This consolidation achieves the signal isolation that would traditionally require multiple separate antennas, while reducing the overall device complexity and component count.
Solution Approach 2:
The single antenna system is designed to handle multiple frequency bands and multiple radios simultaneously through the universal filter assembly. The filter system performs multiple isolation functions across different frequency ranges, allowing one antenna to replace what would traditionally require multiple specialized antennas.
3Reliability
If traditional duplexers are used to isolate widely separated and intermingled frequency bands, then signal isolation is achieved, but device cost becomes prohibitively expensive
Solution Approach 1:
The expensive traditional duplexer isolation function is segmented into multiple smaller, less costly band-pass and band-stop filters. Each filter handles a specific frequency segment, allowing the use of more economical filter technologies rather than requiring expensive wide-range duplexer components.
Solution Approach 2:
The invention replaces expensive traditional duplexer components with more economical filter assemblies. The band-pass and band-stop filters used in this system represent a cost-effective alternative to conventional duplexer technology, achieving the same isolation function at lower manufacturing cost.
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
This solution reduces the cost of multiplexers and antennas, enabling efficient multiplexed multi-band mobile communication using a single antenna, and allows for spatial diversity with fewer antennas, compared to traditional systems requiring multiple antennas.
Implementation Method 1
The band-pass filter is configured to allow signals at frequencies in a pass-band to pass un-attenuated and to attenuate signals at frequencies outside of the pass-band
Implementation Method 2
the band-stop filter is configured to attenuate signals at frequencies in at least a portion of the pass-band and to allow frequencies outside of the pass-band to pass un-attenuated
Implementation Method 3
The first and second receive filters are configured to attenuate signals at frequencies outside of the first and second receive bands, respectively
Data Source
AI summary
A frequency division (FD) multiplexing device includes a multiplexer including a band-pass and a band-stop filter, the multiplexer is communicatively coupled to an antenna, the band-pass filter is configured to allow pass band frequencies to pass un-attenuated and to attenuate signals outside of the pass band. The band-stop filter is configured to attenuate signals at frequencies in at least a portion of the pass-band and allow frequencies outside the pass-band to pass un-attenuated. The multiplexing device further includes filters communicatively coupled to the multiplexer to receive first and second receive signals in first and second receive bands, where the first and second receive filters attenuate signals at frequencies outside of the first and second receive bands, respectively, and first and second transmit filters attenuate signals at frequencies outside a first transmit band and signals at frequencies outside a second transmit band, and couple the first and second filtered transmit signals to the multiplexer such that the first and second transmit signals are transmitted via the antenna. At least one of the first receive band and the first transmit band are located in the pass-band and intermingled between the second receive band and the second transmit band.