High-Frequency Oscillator Assembly with Filtering Branches
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Solution Overview
Problem
Conventional high-frequency oscillator assemblies in dual-polarized multi-band base station antennas generate strong radiation that interferes with low-frequency oscillators, affecting their gain and directionality due to the specific configuration of high-frequency oscillators relative to reflectors and balun heights.
Innovation Solution
A high-frequency oscillator assembly is designed with balun supporting components featuring first open-circuit filtering branches on balun supporting plates, which are cross-arranged and electrically connected to prevent the formation of monopolar low-frequency oscillators that cause strong radiation, thereby minimizing interference with low-frequency oscillators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-frequency oscillators are designed with balun height equal to λH/4 and arm length equal to λH/4, then the high-frequency oscillator can achieve proper impedance matching and radiation performance, but the total length becomes equal to quarter wavelength of low-frequency center frequency, causing strong low-frequency radiation that interferes with low-frequency oscillators
Solution Approach 1:
The patent extracts and removes the problematic monopole radiation component from the high-frequency oscillator system. By introducing a reflector positioned at a specific distance from the high-frequency oscillator, the design eliminates the unwanted low-frequency radiation while preserving the desired high-frequency performance. This extraction approach separates the harmful low-frequency radiation from the useful high-frequency function.
Solution Approach 2:
The reflector acts as an intermediary element between the high-frequency oscillator and the surrounding environment. It mediates the radiation pattern by reflecting and redirecting the electromagnetic waves, thereby controlling the monopole radiation effect. The reflector distance is carefully chosen to be between λH/8 and λH/4 to achieve optimal interference cancellation without directly modifying the high-frequency oscillator structure.
2Object-affected harmful factors
If the distance between high-frequency oscillator and reflector is increased to reduce low-frequency radiation, then interference with low-frequency oscillators decreases, but the high-frequency radiation efficiency and impedance matching deteriorate
Solution Approach 1:
The patent optimizes the reflector distance parameter within a specific range (λH/8 to λH/4) to achieve the best compromise between reducing low-frequency interference and maintaining high-frequency efficiency. By adjusting this critical parameter, the system achieves optimal performance where the reflector is close enough to control the radiation pattern but far enough to minimize low-frequency monopole effects.
3Adaptability or versatility
If conventional high-frequency oscillator assembly is used, then the base station antenna can operate at high frequencies, but beam distortion occurs and the gain and direction of low-frequency oscillators are affected
Solution Approach 1:
The patent segments the antenna system into distinct functional zones by introducing the reflector as a separate component. This segmentation allows independent optimization of high-frequency and low-frequency performance. The reflector creates a controlled electromagnetic environment that isolates the high-frequency oscillator's monopole radiation from affecting the low-frequency oscillators, thereby maintaining stable gain and direction for low-frequency operation.
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 effectively reduces beam distortion and improves the performance of low-frequency oscillators by minimizing cross-polarization and enhancing the front-to-back ratio, resulting in a more focused and efficient radiation pattern for the base station antenna.
Implementation Method 1
The first open-circuit filtering branch and the feeder line of each of the balun supporting plates are electrically connected... the high-frequency oscillator assembly would stop forming monopolar low-frequency oscillators that generate strong radiation
Data Source
AI summary
The present disclosure provides a high-frequency oscillator assembly and a base station antenna. The high-frequency oscillator assembly comprises a balun supporting component and a baseplate. The balun supporting component comprises two balun supporting plates. The balun supporting plate comprises a first surface and a second surface. The first surface comprises a feeder circuit comprising a transmission line and a feeder line. The second surface comprises a first open-circuit filtering branch. The transmission line is disposed on one side of the other balun supporting plate. The feeder line is disposed on the other side of the other balun supporting plate. The first open-circuit filtering branch and the feeder line are electrically connected. The baseplate is disposed on the balun supporting component and comprises a plurality of oscillator arms. The feeder lines are electrically connected with the corresponding oscillator arms respectively.