Nonuniform Resistor Attenuator for Wideband Low-Phase-Imbalance RF
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Solution Overview
Problem
Existing attenuators for high-frequency signals, particularly in mmWave frequencies, face challenges in achieving a wide frequency bandwidth with low insertion loss, high return loss, and minimal phase imbalance, which are crucial for effective beamforming in wireless communication systems.
Innovation Solution
The proposed attenuator design incorporates nonuniform resistors, where the first and second resistors have higher resistance than the third resistor, connected in parallel with transmission lines, and includes phase compensation circuits to maintain low phase imbalance and wide attenuation range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional uniform resistors are used in attenuators for high-frequency signals, then the structure is simple, but the insertion loss increases and return loss decreases at mmWave frequencies
Solution Approach 1:
The patent applies local quality by using nonuniform resistors with different resistance values at different positions in the attenuator circuit. Specifically, the first and second resistors have a first resistance value, while the third and fourth resistors have a second resistance value that is different from the first. This localized variation in resistance values optimizes the attenuator's performance at high frequencies by compensating for frequency-dependent effects, thereby reducing insertion loss and improving return loss without requiring a complete redesign of the entire circuit structure.
Solution Approach 2:
The patent implements parameter changes by varying the resistance values of different resistors in the attenuator circuit. The design specifies that the first and second resistors have a first resistance, while the third and fourth resistors have a second resistance that differs from the first. This parameter variation allows the attenuator to maintain low insertion loss and high return loss across wide frequency bands, particularly at mmWave frequencies, by adjusting the electrical characteristics of different circuit nodes to compensate for frequency-dependent signal degradation.
2Adaptability or versatility
If conventional attenuator designs are used, then the design is straightforward, but phase imbalance increases and frequency bandwidth is limited
Solution Approach 1:
The patent applies local quality by implementing different resistance values at different circuit nodes to optimize performance across wide frequency bands. The first and second resistors have a first resistance value while the third and fourth resistors have a second resistance value, creating localized electrical characteristics that compensate for frequency-dependent phase and amplitude variations. This approach enables the attenuator to maintain low phase imbalance and wide bandwidth coverage without requiring complex external phase compensation circuits.
Solution Approach 2:
The patent employs asymmetry by using nonuniform resistor values in the attenuator circuit. Instead of using identical resistors throughout, the design specifies that the first and second resistors have one resistance value while the third and fourth resistors have a different resistance value. This asymmetric configuration creates intentional electrical imbalances that counteract the natural phase and amplitude imbalances that occur in high-frequency signal paths, thereby reducing overall phase imbalance and extending usable frequency bandwidth.
3Reliability
If uniform resistors are used in parallel configuration, then the circuit is simple, but return loss decreases at high frequencies
Solution Approach 1:
The patent applies local quality by assigning different resistance values to different resistors in the parallel network. The first and second resistors have a first resistance value while the third and fourth resistors have a second resistance value. This localized differentiation optimizes the impedance matching at different circuit nodes, thereby improving return loss at high frequencies by compensating for frequency-dependent impedance variations that occur in parallel resistor configurations.
Solution Approach 2:
The patent implements parameter changes by varying the resistance values within the parallel resistor network. The design specifies that the first and second resistors have a first resistance while the third and fourth resistors have a second resistance that differs from the first. This parameter variation allows the parallel network to maintain better impedance matching across wide frequency bands, thereby improving return loss performance at mmWave frequencies without requiring a complete redesign of the parallel configuration.
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 design achieves low insertion loss, high return loss, and minimal phase imbalance across a wide frequency range, enhancing beamforming accuracy and efficiency in wireless communication systems.
Implementation Method 1
a first resistor connected between a first terminal and a ground node; a second resistor connected between a second terminal and the ground node; and at least one third resistor connected in parallel with the first and second resistors via a transmission line
Data Source
AI summary
An attenuator includes: a first transmission line connected between a first terminal and a first node; a second transmission line connected between the first node and a second terminal; a first resistor connected between the first terminal and a ground node; a second resistor connected between the second terminal and the ground node; and a third resistor connected between the first node and the ground node, wherein the first and second resistors each have a resistance that is higher than a resistance of the third resistor.