RF Isolator Phasor Networks Antenna Isolation
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Solution Overview
Problem
Portable communication devices face challenges in achieving high RF isolation between multiple antennas operating in proximate, adjacent, or overlapping frequency bands, leading to mutual interference and reduced performance in mission-critical applications like public-safety communications.
Innovation Solution
A passive RF isolator system with a reconfigurable RF coupler and phasor-shaping networks is introduced to enhance isolation between antennas, using coupled transmission lines and lumped/distributed components to minimize interference across different frequency bands while maintaining compact size and ergonomic design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple antennas are placed in close proximity for compact device design, then device size is reduced, but RF isolation between antennas deteriorates causing mutual interference
Solution Approach 1:
The patent introduces an RF isolator as an intermediary component between the LMR and LTE transceivers/antennas. This isolator contains coupled transmission lines and phasor-shaping networks that actively cancel mutual coupling effects, allowing antennas to be placed in close proximity while maintaining RF isolation through the mediating isolator structure.
Solution Approach 2:
The patent employs phasor-shaping networks that dynamically adjust signal parameters (phase and amplitude) to cancel mutual coupling. By changing the electrical parameters of the coupled transmission lines and adjusting phasor relationships, the system achieves RF isolation without requiring physical separation of antennas.
2Object-affected harmful factors
If antennas are separated to improve RF isolation, then mutual interference is reduced, but device compactness and ergonomic design are compromised
Solution Approach 1:
The patent resolves the spatial conflict by transitioning from a purely spatial solution (physical separation) to an electromagnetic dimension solution. The coupled transmission lines and phasor-shaping networks operate in the electromagnetic domain to achieve isolation, allowing antennas to maintain compact physical proximity while achieving RF isolation through electromagnetic field manipulation.
3Adaptability or versatility
If multiple transceivers operate in overlapping frequency bands simultaneously, then communication versatility is improved, but receiver sensitivity deteriorates due to spurious emissions and coupling losses
Solution Approach 1:
The patent converts the harmful mutual coupling between transceivers into a beneficial effect by using the same coupled transmission lines to generate canceling signals. The phasor-shaping networks manipulate the coupled signals to produce anti-phase components that cancel spurious emissions, thereby improving receiver sensitivity while maintaining simultaneous operation capability.
Solution Approach 2:
The RF isolator implements a feedback mechanism where signals from one transceiver are coupled through the transmission lines, shaped by phasor networks, and fed back in a canceling manner to reduce spurious emissions and improve the receiver sensitivity of the other transceiver.
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 solution significantly increases RF isolation by up to 20 dB, reducing mutual interference and maintaining performance across various frequency bands, enabling seamless coexistence of LMR and LTE transceivers in portable communication devices.
Implementation Method 1
A passive RF isolator system with a reconfigurable RF coupler and phasor-shaping networks is introduced to enhance isolation between antennas, using coupled transmission lines
Implementation Method 2
phasor-shaping networks is introduced to enhance isolation between antennas
Data Source
AI summary
An antenna system for a portable wireless communication device is provided having a first antenna and a second antenna, the first and second antennas being proximally located causing electromagnetic coupling therebetween. An isolator is coupled with the first and second antennas and the first and second RF transceivers at respective interface ports. The isolator Comprises a radio frequency (RF) coupler featuring four RF coupler ports. The four RF coupler ports are coupled to respective phasor-shaping networks at each of the four RF coupler ports. The first and second RF transceivers operate independently in respective frequency bands.