Nonreciprocal Circuit Element Isolation Bandwidth
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Solution Overview
Problem
Existing non-reciprocal circuit elements, such as isolators, face a trade-off between widening the insertion loss bandwidth and the isolation bandwidth, where improving one characteristic often compromises the other.
Innovation Solution
A non-reciprocal circuit element is designed with a permanent magnet, ferrite, center electrodes, matching capacitors, a resistor, and an LC series resonant circuit, where the inductor and capacitor are connected in parallel to the center electrode and in series with the resistor between the input and output ports, enhancing the isolation characteristic without increasing insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the intersection angle between center electrodes is adjusted to widen the insertion loss bandwidth, then the insertion loss bandwidth is improved, but the isolation bandwidth is narrowed
Solution Approach 1:
The patent divides the impedance control function into two independent parts: matching capacitors control the insertion loss bandwidth, while the LC series resonant circuit controls the isolation bandwidth. This segmentation allows each parameter to be optimized independently without affecting the other, resolving the contradiction between insertion loss bandwidth and isolation bandwidth.
Solution Approach 2:
The patent changes the electrical parameters by introducing matching capacitors and an LC series resonant circuit with specific impedance values. By adjusting the capacitance of the matching capacitors and the impedance of the LC series resonant circuit, the patent independently controls the bandwidth parameters to achieve both wide insertion loss bandwidth and wide isolation bandwidth simultaneously.
2Reliability
If the isolation bandwidth is widened, then the isolation characteristic is improved, but the insertion loss bandwidth is narrowed
Solution Approach 1:
The patent segments the bandwidth control functions by assigning matching capacitors to control insertion loss bandwidth and an LC series resonant circuit to control isolation bandwidth. This functional segmentation enables independent optimization of each bandwidth parameter, allowing both to be widened simultaneously without the trade-off present in conventional designs.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the impedance of the LC series resonant circuit and the capacitance values of the matching capacitors. These parameter adjustments enable independent control over isolation bandwidth and insertion loss bandwidth, allowing both to be optimized to their maximum values without compromising each other.
3Reliability
If additional components (LC series resonant circuit and resistor) are added to improve isolation, then the isolation bandwidth is widened, but the insertion loss increases
Solution Approach 1:
The patent changes the electrical parameters by setting the impedance of the LC series resonant circuit to a specific value (e.g., 300 ohms) and selecting appropriate capacitance values for the matching capacitors. These parameter choices ensure that the additional components improve isolation bandwidth while minimizing their impact on insertion loss, as the matching capacitors compensate for the impedance changes introduced by the LC circuit and resistor.
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 configuration widens the isolation bandwidth while maintaining a low insertion loss, as high-frequency current primarily flows through the second center electrode, minimizing loss through the LC series resonant circuit and resistor.
Implementation Method 1
a permanent magnet, a ferrite arranged to receive a direct-current magnetic field from the permanent magnet
Implementation Method 2
a ferrite arranged to receive a direct-current magnetic field
Implementation Method 3
an inductor and a capacitor constituting an LC series resonant circuit
Data Source
AI summary
A non-reciprocal circuit element capable of improving an isolation characteristic without increasing an insertion loss includes a permanent magnet, a ferrite arranged to receive a direct-current magnetic field from the permanent magnet, and first and second center electrodes disposed on the ferrite. One end of the first center electrode is connected to an input port, whereas the other end is connected to an output port. One end of the second center electrode is connected to the output port, whereas the other end is connected to a ground port. A matching capacitor and a resistor are connected between the input port and the output port. An inductor and a capacitor constituting an LC resonant circuit are connected in series with the resistor.