Related Experiment Video
Updated: Aug 22, 2025
15:25
Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
6.2K
A Low Profile Ultra-Wideband Antenna with Reconfigurable Notch Band Characteristics for Smart Electronic Systems
Abir Zaidi1, Wahaj Abbas Awan2, Adnan Ghaffar3
1Laboratory EEA & TI, Faculty of Science and Techniques (FSTM) Mohammedia, Hassan II University, Casablanca 20000, Morocco.
Micromachines
|November 11, 2022
Summary
This study presents a compact reconfigurable ultra-wideband (UWB) antenna for smart electronics. It offers adjustable notch bands to mitigate interference in key wireless communication frequencies.
Area of Science:
- Electrical Engineering
- Antenna Theory
- Wireless Communications
Background:
- Ultra-wideband (UWB) antennas are crucial for modern wireless systems, but interference from specific frequency bands (e.g., WiMAX, Wi-Fi) can degrade performance.
- Existing UWB antennas often lack the flexibility to adapt to changing spectral regulations or interference sources.
- Smart electronic systems require compact, efficient antennas with tunable characteristics.
Purpose of the Study:
- To design and implement a small, printed UWB antenna with on-demand adjustable notching capabilities.
- To enable mitigation of contiguous sub-bands at 3-4.1 GHz and/or 4.45-6.5 GHz.
- To provide a reconfigurable antenna solution suitable for integration into compact smart electronic devices.
Main Methods:
- The antenna utilizes an open-ended stub with a partial ground plane for the upper notch band and a U-shaped slot in the radiating structure for the lower notch band.
- Two diodes are incorporated to achieve reconfigurability, switching between UWB, single-notch, and dual-notch modes.
- Design and performance were validated through both electromagnetic simulation and physical measurements.
Main Results:
- The proposed antenna achieves a compact size of 17 × 23 mm², a maximum gain of 4.9 dBi, and high efficiency (>80%).
- It demonstrates a wide fractional bandwidth of 180% centered at 5.2 GHz.
- The antenna successfully mitigates specific frequency bands (3-4.1 GHz and 4.45-6.5 GHz) when reconfigured.
Conclusions:
- The designed reconfigurable UWB antenna offers superior performance in terms of compactness, gain, and programmable notch features compared to existing literature.
- Its small form factor and ease of integration facilitate its adoption in various small electronic devices.
- The on-demand notching capability enhances its suitability for diverse wireless applications facing spectral interference.
More Related Videos
Related Concept Videos
01:23Design Example
356
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...
356
01:24Characteristics of Series Resonant Circuit
299
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:
299
01:23Parallel Resonance
255
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:
255
01:15Standing Electromagnetic Waves
1.7K
Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
1.7K
01:25Active Filters
894
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:
894
01:27Passive Filters
581
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...
581