Differential Antenna Driving Without Splitter Signal Loss
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Solution Overview
Problem
RF communication systems face challenges in efficiently driving patch antennas with differential signals without using splitters, leading to signal loss and interference issues, particularly in 5G massive MIMO base stations where cross-polarized dipole antennas are used.
Innovation Solution
Implementing a differential power amplifier system that drives patch antennas with both positive and negative outputs, eliminating the need for splitters by ensuring equal amplitude and phase signals reach both antennas, thus achieving constructive interference and reducing signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-ended RF signals are used to drive antennas, then the system is simpler to implement, but signal loss and interference issues occur
Solution Approach 1:
The patent replaces single-ended RF signal driving with differential RF signal driving. This substitution changes the fundamental signaling method from single-ended to differential, eliminating the need for splitters and reducing signal loss while maintaining system functionality.
Solution Approach 2:
The patent changes the signal type parameter from single-ended to differential. By modifying this fundamental parameter, the system achieves better signal integrity and reduces loss without requiring additional components like splitters.
2Ease of operation
If splitters are used to drive multiple antennas, then signal distribution is achieved, but splitter-related losses and interference increase
Solution Approach 1:
The patent extracts and removes the splitter component from the antenna driving system. By eliminating the splitter, the system avoids splitter-related signal losses and interference while maintaining the ability to drive multiple antennas through differential signaling.
Solution Approach 2:
The patent introduces differential signaling as an intermediary mechanism to achieve signal distribution without using splitters. The differential signal inherently provides the necessary signal distribution to multiple antennas while avoiding the losses associated with traditional splitter components.
3Reliability
If differential power amplifiers with positive and negative outputs are used, then signal symmetry and constructive interference are achieved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple amplifiers into a single differential power amplifier with positive and negative outputs. This consolidation achieves signal symmetry and constructive interference while reducing the overall number of components compared to using multiple separate amplifiers.
Solution Approach 2:
The patent utilizes the asymmetric positive and negative outputs of the differential power amplifier to create symmetric signal distribution across the antennas. The asymmetric nature of the differential outputs enables constructive interference patterns that improve signal reliability.
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 approach enhances signal strength and symmetry of the radiation pattern, improves noise figure, and reduces costs by eliminating splitter-related losses, while maintaining the benefits of differential signaling.
Implementation Method 1
The first and second patch antenna can be configured to have the same polarization when driven by the positive and negative outputs such that the first transmit radio frequency signal when radiated from each of the first and second patch antennas constructively interferes.
Data Source
AI summary
Systems and methods for differential antenna driving are provided. In one aspect, a front end system includes at least one power amplifier configured to receive a first transmit radio frequency signal from a baseband processor, amplify the first transmit radio frequency signal, and output the amplified first transmit radio frequency signal. The front end system further includes at least one balun configured to receive the amplified first transmit radio frequency signal. The at least one balun includes a positive output coupled to a first monopole of at least one antenna and a negative output coupled to a second monopole of the at least one antenna.