Tunable Balun Amplitude Control for STAR Antenna Isolation
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Solution Overview
Problem
Simultaneous transmit and receive (STAR) antennas face limited isolation due to manufacturing and assembly asymmetries in balun feed systems, resulting in insufficient antenna isolation, which affects spectral efficiency and interferes with receiver components.
Innovation Solution
The integration of a tunable balun with an attenuator chip and an antenna agnostic feed network enhances antenna isolation by compensating for amplitude imbalances, achieving greater than 40 decibels of isolation through direct current voltage control, thereby improving transmitter interference cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standard balun feed system is used in STAR antennas, then the antenna structure is simple and easy to manufacture, but the isolation between transmit and receive is limited to 30-40 dB due to manufacturing and assembly asymmetries
Solution Approach 1:
The patent employs a tunable balun with adjustable amplitude control capability, allowing the system to dynamically compensate for manufacturing and assembly asymmetries. The balun can be tuned to achieve optimal amplitude balance between antenna elements, thereby achieving greater than 40 dB isolation despite variations in manufacturing precision.
Solution Approach 2:
The invention changes the amplitude parameter of the balun feed signals to compensate for asymmetries. By adjusting the amplitude control of the balun, the system optimizes the signal distribution to achieve high isolation performance. This parameter adjustment capability allows the system to overcome fixed design limitations and achieve greater than 40 dB isolation.
2Reliability
If amplitude imbalances are not compensated, then the balun structure remains simple, but the transmitter interference cancellation is insufficient and receiver components may be saturated
Solution Approach 1:
The patent implements an amplitude control mechanism in the balun that provides feedback compensation for amplitude imbalances. The system measures or detects the actual amplitude distribution and adjusts the balun output accordingly to achieve balanced signals, ensuring reliable interference cancellation and preventing receiver saturation.
Solution Approach 2:
The balun is designed with preliminary amplitude control capability that compensates for expected asymmetries before the signal reaches the receiver. By pre-balancing the amplitude of signals from different antenna elements at the balun output, the system prevents interference saturation issues before they occur at the receiver stage.
Data Source
AI summary
Baluns and antenna devices that achieve improved antenna isolation for simultaneous transmit and receive (STAR) antennas are provided. A tunable balun can be used to compensate for amplitude imbalances in a multi-antenna radio, and/or an antenna agnostic feed network can be used to improve isolation in a single antenna radio. The balun can be integrated directly into the antenna. The balun can control the amplitude of each signal to ensure they are equal, resulting in greater transmitter interference cancellation.