Related Experiment Video
Updated: Jul 13, 2026
10:16
X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells
Published on: August 20, 2019
Properties of microstrip filter with elliptic-fractal pattern
Sheng Wang1, MingSen Guo, Wei Liu
1Department of Physics, Wuhan University, Wuhan 430072, China.
The Review of Scientific Instruments
|August 4, 2007
Summary
This study introduces an improved microstrip band gap filter utilizing an elliptic-fractal pattern. The novel design enhances filter performance, offering tunable band stop bandwidths for advanced electronic applications.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Materials Science
Background:
- Microstrip band gap filters are crucial components in microwave and RF circuits.
- Enhancing filter performance, such as bandwidth and center frequency, is an ongoing research area.
- Fractal geometries offer unique electromagnetic properties for device miniaturization and performance improvement.
Purpose of the Study:
- To investigate the properties of a novel microstrip band gap filter incorporating an elliptic-fractal pattern.
- To enhance the performance characteristics of microstrip band gap filters using fractal and elliptic geometries.
- To analyze the dual-mode band gap filter's behavior and validate simulation results.
Main Methods:
- Design and simulation of a microstrip band gap filter with an elliptic-fractal pattern.
- Utilizing the finite-difference time-domain (FDTD) method for electromagnetic simulation.
- Experimental fabrication and testing of the designed filter.
Main Results:
- The filter exhibits distinct band gap characteristics centered around 5.5 GHz and 15 GHz.
- The band stop bandwidth can be effectively tuned by adjusting the number of fractal cells.
- Simulation results closely align with experimental measurements, confirming the design's validity.
Conclusions:
- The elliptic-fractal pattern significantly improves microstrip band gap filter performance.
- The proposed filter design demonstrates dual-mode operation with tunable bandwidth.
- This research provides a viable approach for developing advanced frequency-selective devices.
Related Concept Videos
01:25Active Filters
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
01:27Polar Coordinates: Problem Solving
Directional radiation patterns are central to antenna analysis, as they illustrate how signal strength varies with direction. These patterns are often modeled using polar plots, where the radial distance from the origin represents signal intensity at a given angle. A commonly used idealized form is the four-lobed rose curve, which captures the concept of directional beams in a simplified mathematical form.The four-lobed rose curve, described by r = cos(2θ), features four symmetric lobes, each...
01:20Properties of Fourier series I
The Fourier series is a powerful tool in signal processing and communications, allowing periodic signals to be expressed as sums of sine and cosine functions. A foundational property of the Fourier series is linearity. If we consider two periodic signals, their linear combination results in a new signal whose Fourier coefficients are simply the corresponding linear combinations of the original signals' coefficients. This property is crucial in applications like frequency modulation (FM) radio,...
01:24Characteristics of Series Resonant Circuit
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
01:27Passive Filters
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
01:24Properties of DTFT I
In signal processing, Discrete-Time Fourier Transforms (DTFTs) play a critical role in analyzing discrete-time signals in the frequency domain. Various properties of the DTFTs such as linearity, time-shifting, frequency-shifting, time reversal, conjugation, and time scaling help understand and manipulate these signals for different applications.
The linearity property of DTFTs is fundamental. If two discrete-time signals are multiplied by constants a and b respectively, and then combined to...
The linearity property of DTFTs is fundamental. If two discrete-time signals are multiplied by constants a and b respectively, and then combined to...