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Design of Two Compact Wideband Monopoles Through Loading with Linear Approximated Lumped Components
Jiansen Ma1, Weiping Cao1, Xinhua Yu1
1Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Guilin 541004, China.
Micromachines
|January 8, 2025
Summary
Two novel ultra-wideband monopole antennas were developed for remote terrestrial communications. Optimized frequency-dependent loads enable wide bandwidths, achieving VSWR below 3.5 and 2.5 for distinct frequency ranges.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Antenna Theory
Background:
- Remote terrestrial communication systems require antennas with broad operational bandwidths.
- Traditional antennas often exhibit narrow bandwidths, limiting their application in diverse communication scenarios.
- Ultra-wideband (UWB) antennas offer a solution for high-capacity, multi-service communication.
Purpose of the Study:
- To design and simulate two collinear ultra-wideband (UWB) monopole antennas.
- To investigate the use of linear frequency-dependent lumped loads for achieving UWB characteristics.
- To evaluate antenna performance for remote terrestrial communication applications.
Main Methods:
- Antenna design utilizing a collinear structure with loaded monopoles and a hat.
- Modeling lumped loads as linear frequency-dependent components to mimic practical behavior.
- Simulation using the Method of Moments (MoM) coupled with Asymptotic Waveform Evaluation (AWE) for efficient frequency sweep.
- Impedance function modeling for parallel RLC loads with frequency-dependent components for AWE compatibility.
Main Results:
- One antenna achieved coverage from 30-750 MHz with a Voltage Standing Wave Ratio (VSWR) less than 3.5.
- The second antenna covered the 800 MHz-3000 MHz range with a VSWR below 2.5.
- Optimized load parameters were crucial for achieving the desired ultra-wideband performance.
Conclusions:
- The developed collinear UWB monopole antennas show promising performance for terrestrial omnidirectional applications.
- The use of frequency-dependent loads effectively broadens antenna bandwidth.
- The simulation methodology provides an efficient approach for designing UWB antennas with practical component models.
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