Non-reciprocal Circuit Element Flat Isolation Design
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Solution Overview
Problem
Conventional non-reciprocal circuit elements, such as circulators and isolators, often exhibit non-flat isolation characteristics, which can lead to inaccurate power detection and gain control in wireless communication devices, especially when high reflection occurs, necessitating the development of components with almost flat isolation characteristics across a wide bandwidth.
Innovation Solution
The design involves a non-reciprocal circuit element with intersecting center conductors around a microwave magnetic body subjected to a direct current magnetic field, utilizing capacitance and inductance elements in series and parallel configurations to achieve flat isolation characteristics, with specific connections and terminations that allow high-frequency signal routing and reversal based on the magnetic field direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional non-reciprocal circuit elements are used, then the device structure is simple, but the isolation characteristics are non-flat
Solution Approach 1:
The patent divides the non-reciprocal circuit element into multiple independent impedance adjustment sections, each capable of being adjusted separately. This segmentation allows precise control over the isolation characteristics across different frequency bands, enabling flat isolation performance while maintaining a modular structure that doesn't excessively increase overall device complexity
Solution Approach 2:
The patent applies different impedance values to different sections of the circuit, with each section optimized for specific frequency ranges. By making the impedance characteristics location-dependent rather than uniform, the circuit achieves flat isolation characteristics across the entire bandwidth while keeping each local section relatively simple
2Measurement precision
If conventional circulators are used in wireless communication devices, then the device structure is compact, but accurate power detection cannot be achieved under high reflection conditions
Solution Approach 1:
The patent adjusts the impedance parameters of the non-reciprocal circuit element to optimize isolation characteristics. By changing the impedance values in different sections, the circuit achieves flat isolation across the operating bandwidth, which ensures that power detection remains accurate even under high reflection conditions, thereby improving both measurement precision and control 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
The solution provides almost flat isolation characteristics across a wide bandwidth, ensuring accurate power detection and control in wireless communication devices by maintaining consistent signal transmission and reception performance.
Implementation Method 1
a first center conductor, a second center conductor, and a third center conductor are disposed, in an insulated state and intersecting with one another, around a microwave magnetic body to which a direct current magnetic field is applied by a permanent magnet
Implementation Method 2
a first capacitance element is connected to the first center conductor in parallel, and a second capacitance element is connected to the second center conductor in parallel; other ends of the first center conductor, the second center conductor, and a third center conductor are connected to one another, and are grounded via a first inductance element and a third capacitance element that are connected in series
Data Source
AI summary
In a non-reciprocal circuit element, first to third center conductors intersect one another in an insulated state around a microwave magnetic body, and first ends of the first to third center conductors define first to third ports. A first capacitance element is connected to the first center conductor in parallel and a second capacitance element is connected to the second center conductor in parallel, and the other ends of the first to third center conductors are connected to one another and are grounded via a first inductance element and a third capacitance element that are connected in series. A second inductance element is connected to one end of the center conductor in parallel, and the other end of the second inductance element is grounded. A fourth capacitance element is connected to a connection point between the one end of the center conductor and the second inductance element, and the other end of the fourth capacitance element is connected to a third terminal.