Related Experiment Video
Updated: Jan 18, 2026
15:25
Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
6.5K
Dual-band mixed-mode bandpass filter based on dual-layer substrate integrated waveguide resonator loaded with A
Rihui Zeng1,2, Jianpei Chen1,2, Xia Luo1,2
1The School of Electrics and Information Engineering, Yunnan Minzu University, Kunming, China.
Plos One
|September 8, 2025
Summary
A novel dual-band microwave filter using a capacitive patch dual-layer substrate integrated waveguide resonator (CP-DSIWR) was developed. This compact, high-performance filter achieves tunable dual-band filtering, crucial for modern communication systems.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Microwave Engineering
Background:
- Modern communication systems require compact, high-performance microwave filters.
- Existing filters often face limitations in size, performance, or tunability.
Purpose of the Study:
- To propose and analyze a novel mixed-mode bandpass filter.
- To achieve a compact and tunable dual-band filtering response.
Main Methods:
- Theoretical analysis of a capacitive patch dual-layer substrate integrated waveguide resonator (CP-DSIWR).
- Design of metallic vias for mode coupling and a center slot for frequency tuning.
- Microstrip line feeding for filter integration.
Main Results:
- Excitation of TM01, TM10, and TE101 modes.
- Achieved dual-band filtering centered at 6.2 GHz and 12.9 GHz.
- Demonstrated tunable frequency characteristics in a compact 0.57λ × 0.57λ footprint.
Conclusions:
- The proposed CP-DSIWR filter meets the demand for compact and high-performance microwave filtering.
- Experimental validation confirms good agreement with simulations.
- The filter is suitable for advanced communication systems requiring dual-band operation.
Related Concept Videos
01:27Passive Filters
958
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...
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...
958
01:23Parallel Resonance
522
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
522
01:25Active Filters
1.3K
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:
1.3K
01:24Characteristics of Series Resonant Circuit
573
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:
573
01:20Design Example: Capacitance Multiplier Circuit
1.5K
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
1.5K
01:23Design Example
531
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
531