Performance enhancement of integrated light emitting diode and wi-fi antenna using stacked microstrip / Hamizan Yon

Previous works on integrated antenna with LED have been developed by researcher to support a new concept of dual functionality in wireless communication and lighting systems. Somehow, the inconsistency in resonant frequency and antenna gain have driven this research to overcome previous limitations. Three antenna designs on stacked patch antenna were proposed. Antenna Design 1 to minimize frequency shifting, Design 2 with parallel LED circuit connection for power consumption concept and Design 3 to increase the gain. All antenna designs were simulated on FR-4 substrate to resonate at 2.45GHz. By using the stacked configuration on antenna Design 1, it was shown that frequency shifted was eliminated. Antenna Design 2 proposed a new LEDs circuit connections mainly designed to reduce power supply used to turn ON the LEDs. As a result, the voltage source for the LEDs circuit was reduced to 90% from previous works and the number of LEDs used also found to be increased, hence better parasitic and illumination effect. A air gap structure was introduced on antenna Design 3 which is located between substrate 1 and substrate 2 and optimization was done by using simulation software. Implementation of air gap structure has contributed to 54% improvement on gain at final anten na Design 3. All the three antenna designs have been fabricated and good agreement was achieved between the simulation and measurement result. A dual-functional prototype consists of Wi-Fi antenna and illumination device has been successfully developed. Adopted methods and techniques were able to significantly reduce the frequency shifting and increase the gain, as well as reducing the power consumption

Integrated Stacked Microstrip Antenna with Light Emitting Diode (LED) for Wi-Fi Application

Investigation of Light Emitting Diode (LED) integrated with a rectangular stacked microstrip antenna is presented in this paper. The antenna designed at 2.45 GHz to support Wi-Fi applications. The antenna is simulated by using Computer Simulation Technology (CST). The LEDs are located at the top layer as the parasitic element, while patch radiator located at the second substrate. Meanwhile, ground plane and feed line are located on the bottom substrate. Simulated and measured results are compared to identify the feasibility of proposed integrated antenna. The performances of rectangular stacked microstrip antenna in term of return loss, gain and radiation pattern was verified. Result between simulation and fabrication shows that antenna potentially provide a new opportunity to introduce dual functionalit

Development of C-Shaped Parasitic MIMO Antennas for Mutual Coupling Reduction

In the 5G system, multiple-input multiple-output (MIMO) antennas for both transmitting and receiving ends are required. However, the design of MIMO antennas at the 5G upper band is challenging due to the mutual coupling issues. Many techniques have been proposed to improve antenna isolation; however, some of the designs have impacts on the antenna performance, especially on the gain and bandwidth reduction, or an increase in the overall size. Thus, a design with a detailed trade-off study must be implemented. This article proposes a new C-shaped parasitic structure around a main circular radiating patch of a MIMO antenna at 16 GHz with enhanced isolation features. The proposed antenna comprises two elements with a separation of 0.32λ edge to edge between radiation parts placed in a linear configuration with an overall dimension of 15 mm × 26 mm. The C-shaped parasitic element was introduced around the main radiating antenna for better isolation. Based on the measurement results, the proposed structure significantly improved the isolation from −23.86 dB to −32.32 dB and increased the bandwidth from 1150 MHz to 1400 MHz. For validation, the envelope correlation coefficient (ECC) and the diversity gain (DG) were also measuredas 0.148 dB and 9.89 dB, respectively. Other parameters, such as the radiation pattern, the total average reflection coefficient and the mean effective gain, were also calculated to ensure the validity of the proposed structure. Based on the design work and analysis, the proposed structure was proven to improve the antenna isolation and increase the bandwidth, while maintaining the small overall dimension

Development of c-shaped parasitic MIMO antennas for mutual coupling reduction

In the 5G system, multiple-input multiple-output (MIMO) antennas for both transmitting and receiving ends are required. However, the design of MIMO antennas at the 5G upper band is challenging due to the mutual coupling issues. Many techniques have been proposed to improve antenna isolation; however, some of the designs have impacts on the antenna performance, especially on the gain and bandwidth reduction, or an increase in the overall size. Thus, a design with a detailed trade-off study must be implemented. This article proposes a new C-shaped parasitic structure around a main circular radiating patch of a MIMO antenna at 16 GHz with enhanced isolation features. The proposed antenna comprises two elements with a separation of 0.32λ edge to edge between radiation parts placed in a linear configuration with an overall dimension of 15 mm × 26 mm. The C-shaped parasitic element was introduced around the main radiating antenna for better isolation. Based on the measurement results, the proposed structure significantly improved the isolation from −23.86 dB to −32.32 dB and increased the bandwidth from 1150 MHz to 1400 MHz. For validation, the envelope correlation coefficient (ECC) and the diversity gain (DG) were also measuredas 0.148 dB and 9.89 dB, respectively. Other parameters, such as the radiation pattern, the total average reflection coefficient and the mean effective gain, were also calculated to ensure the validity of the proposed structure. Based on the design work and analysis, the proposed structure was proven to improve the antenna isolation and increase the bandwidth, while maintaining the small overall dimension