Microstrip Oscillator Layout for Parasitic Oscillation Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing oscillators using negative resistance devices and microstrip resonators face challenges in suppressing parasitic oscillations, as it is difficult to dispose a low-impedance circuit within the microstrip resonator without interfering with the resonance magnetic field.
Innovation Solution
A low-impedance circuit is formed using a resistance device and a capacitance device connected by a strip conductor, where the inductance of the strip conductor and capacitance of the microstrip resonator produce a resonance frequency, allowing the low-impedance circuit to be positioned to suppress parasitic oscillations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low-impedance circuit is disposed within λosc/4 from the negative resistance device on the power source side to suppress parasitic oscillation, then parasitic oscillation is suppressed, but it becomes difficult to dispose the low-impedance circuit in a microstrip resonator such as a patch antenna without interfering with the resonance magnetic field
Solution Approach 1:
A ground electrode is introduced as an intermediary element between the patch antenna and the low-impedance circuit. The ground electrode extends from beneath the patch antenna toward the low-impedance circuit, providing a dedicated return path for currents. This mediator allows the low-impedance circuit to be disposed at a position that would otherwise be too close to the patch, enabling parasitic oscillation suppression while minimizing interference with the resonance magnetic field of the patch antenna.
2Reliability
If the low-impedance circuit is disposed closer to the negative resistance device to effectively suppress parasitic oscillation, then suppression effectiveness is improved, but the interference with the resonance magnetic field increases
Solution Approach 1:
The ground electrode serves as a mediator that enables the low-impedance circuit to be positioned close to the negative resistance device for effective parasitic oscillation suppression, while simultaneously protecting the patch antenna's resonance magnetic field from excessive interference. The ground electrode provides a controlled current return path that reduces unwanted magnetic field interactions.
Solution Approach 2:
The ground electrode is strategically positioned and dimensioned to provide localized current return paths in specific regions. By controlling the extent and position of the ground electrode, the solution creates different electromagnetic environments in different locations: close to the patch where magnetic field control is needed, and close to the low-impedance circuit where parasitic oscillation suppression is needed.
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 enables the suppression of parasitic oscillations in the microstrip resonator, ensuring that the desired oscillation frequency is maintained without generating additional oscillations in the frequency region of DC or higher and lower than the oscillation frequency.
Implementation Method 1
an inductance L of the strip conductor and a capacitance C of the microstrip resonator produce a resonance frequency of 1/2π√LC
Data Source
AI summary
An oscillator configured to oscillate an electromagnetic wave, including: a negative resistance device; a microstrip resonator configured to determine an oscillation frequency of an electromagnetic wave excited by the negative resistance device; a resistance device and a capacitance device, which form a low-impedance circuit configured to suppress parasitic oscillation; and a strip conductor configured to connect the capacitance device of the low-impedance circuit and the microstrip resonator to each other, in which an inductance L of the strip conductor and a capacitance C of the microstrip resonator produce a resonance frequency of ½π√LC, and ¼ of an equivalent wavelength of the resonance frequency is larger than a distance between the negative resistance device and the resistance device of the low-impedance circuit via the strip conductor, is provided.