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Updated: Dec 29, 2025

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
A Rectangular Notch-Band UWB Antenna with Controllable Notched Bandwidth and Centre Frequency.
Anees Abbas1, Niamat Hussain1, Min-Joo Jeong1
1Departement of Computer and Communication Engineering, Chungbuk National University, Cheongju 28644, Korea.
This study introduces a compact ultra-wideband (UWB) antenna featuring a tunable notch filter. This design effectively rejects wireless local area network (WLAN) signals while maintaining broad operational bandwidth and stable performance.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Antenna Theory
Background:
- Ultra-wideband (UWB) antennas offer high data rates but require interference mitigation.
- Wireless Local Area Network (WLAN) bands can interfere with UWB systems.
- Controllable notch filters are crucial for selective signal rejection in UWB antennas.
Purpose of the Study:
- To design and realize a compact UWB antenna with a controllable notch filter.
- To achieve rejection of the WLAN band (5-6 GHz) while maintaining UWB characteristics.
- To demonstrate the tunability of the notch bandwidth and center frequency.
Main Methods:
- Truncating the lower ends of a rectangular microstrip patch for UWB operation.
- Employing electromagnetic bandgap (EBG) structures with metallic conductors and shorting pins for notch filtering.
- Tuning the resonant frequencies of EBGs to control the notch characteristics.
Main Results:
- The proposed antenna operates from 3.1-12.5 GHz with a notched band from 5-6 GHz.
- Simulated and measured results confirm the antenna's UWB performance and WLAN band rejection.
- The notch characteristics were successfully tuned, demonstrating potential for X-band satellite communication applications.
Conclusions:
- A compact UWB antenna with a highly selective, controllable notch filter has been successfully designed and realized.
- The antenna exhibits stable gain and radiation patterns, suitable for various wireless applications.
- The demonstrated tunability of the notch filter offers flexibility for on-demand rejection band applications.
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