Related Experiment Video
Updated: Aug 15, 2025
13:44
Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
15.4K
A Wideband High-Isolation Microstrip MIMO Circularly-Polarized Antenna Based on Parasitic Elements
Ijaz Khan1, Kuang Zhang1, Qun Wu1
1School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China.
Materials (Basel, Switzerland)
|January 8, 2023
Summary
This study introduces a novel wideband, circularly-polarized (CP) Multiple-Input Multiple-Output (MIMO) antenna with high isolation. The design utilizes parasitic elements to enhance performance for Wireless Local Area Network (WLAN) applications.
Area of Science:
- Electromagnetics and Antennas
- Wireless Communication Systems
Background:
- Multiple-Input Multiple-Output (MIMO) antennas are crucial for enhancing wireless communication capacity.
- Circular Polarization (CP) is desirable for mitigating multipath fading and orientation mismatch.
- Achieving high isolation and wide bandwidth in compact MIMO-CP antennas remains a challenge.
Purpose of the Study:
- To design and validate a wideband, high-isolation, circularly-polarized (CP) MIMO antenna.
- To investigate the impact of parasitic elements on antenna performance, including impedance matching, isolation, and axial ratio.
- To evaluate the antenna's suitability for Wireless Local Area Network (WLAN) applications.
Main Methods:
- A novel wideband, all-side square-cut square patch MIMO-CP antenna design is presented.
- Parasitic elements comprising periodic square metallic plates (9 × 5) were incorporated.
- The antenna was fabricated on an FR4 substrate (1.6 mm height) with outer dimensions of 40 × 70 mm².
- Simulated and measured results were compared to assess performance metrics.
Main Results:
- The proposed antenna achieved a wide bandwidth (BW) of 4.89–6.85 GHz for S11 < −10 dB.
- A 3 dB axial ratio (AR) bandwidth was observed from 5.42–6.58 GHz.
- Peak gain reached 6.6 dB, with isolation exceeding 30 dB.
- The antenna demonstrated improved efficiency, low Envelope Correlation Coefficient (ECC), high Diversity Gain (DG), low Channel Capacity Loss (CCL), and favorable Total Active Reflection Coefficient (TARC).
Conclusions:
- The designed MIMO-CP antenna offers wide bandwidth, high isolation, and excellent CP performance.
- Parasitic elements effectively reduce mutual coupling and enhance S-parameters and axial ratio.
- The antenna's performance characteristics make it suitable for WLAN applications.
More Related Videos
Related Concept Videos
01:12Mesh Analysis for AC Circuits
406
In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
406
01:23Parallel Resonance
249
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:
249
01:24Characteristics of Series Resonant Circuit
295
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:
295
01:42The Antenna Complex
6.1K
Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency...
6.1K
01:20Design Example: Capacitance Multiplier Circuit
895
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.
895
01:23Transmission Line Design Considerations
193
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
193