UHF meander bowtie antenna for RFID application

This paper describes the development of four different ultra-high frequency (UHF) radio frequency identification (RFID) tag antenna using polycarbonate material or transparent paper as the substrate and aluminum tape as the radiating element. The main advantage of the method is that the materials are easy to obtain where it can be found in any hardware stores or in any general online shop. Plus, the antennas are designed in such a way that a meander line is traced along the shape of a bowtie antenna so that the antenna would operate at UHF band. The results of all four of the tag antenna designs are discussed and compared using graph obtained from Computer Simulation Technology (CST) simulation results and measurement results obtained from a portable Vector Network Analyzer (VNA) for the reflection coefficient, S11, and measurement results taken from VNA in chamber room for the radiation pattern. Finally, the results show that the measured results are in agreement with the simulated result and that the UHF RFID tag antennas are able to operate at UHF RFID band

Wireless Sensor Node with Passive RFID for Indoor Monitoring System

This paper discusses the development of an indoor monitoring system based on passive radio frequency identification (RFID) system and Raspberry Pi 3. There are two algorithms designed for this project where the first is to link the RFID module to the Raspberry Pi 3, and the other one is to send the data obtained to a database over wireless network via UDOO Quad as a secondary router. The result is then displayed on a localhost generated using XAMPP. The objective of this project is to realize a monitoring system that incorporates different systems such as Raspberry Pi 3, UDOO Quad, and also RFID module by designing algorithms using Python and C programming language. Plus, the performance of the system is also analyzed using different type of antennas such as the Raspberry Pi 3 Antenna, monopole antenna, and a Yagi Uda antenna in terms of power received versus distance in both line of sight position and non-line of sight position. Finally, antenna that produces the best performance for line-of-sight (LOS) propagation is Yagi Uda antenna while monopole antenna is better when it comes to non-line-of-sight (NLOS) propagation

Long-range monitoring system with PDMS material

This paper describes the development of a long range monitoring system that integrates Cottonwood: UHF Long Distance RFID reader module with Raspberry Pi 3. When a UHF RFID tag is within the UHF RFID reader antenna’s range, the unique ID of the tag will be transferred to the Raspberry Pi 3 to be processed. Then, the data will be sent over to the database wirelessly to be managed, stored, and displayed. The paper also describes the measurement done to determine the most suitable thickness of PDMS material so that it could be incorporated as a wearable transponder. After the result is calculated and tabulated, it can be concluded that the most suitable thickness of PDMS material for the transponder is 8 mm

UHF RFID antenna tag design and analysis for antenna miniaturization

This paper proposes four designs of UHF RFID antenna tag with two different radiating element, copper and aluminum, for antenna miniaturization. The main contribution of this work is the unique design that involves a meander line traced in a variety shape of a bowtie antenna. The UHF RFID band is achieved by reshaping a 900 MHz straight line dipole antenna into the form of a bowtie, thus reducing the size of the antenna significantly while maintaining the operating frequency. The effectiveness of the method is tested in multiple steps. First, the antenna tag designs are run through CST software simulations and optimized to achieve desired outcome. Next, the designs are transferred to Silhouette Studio software to be fabricated using a cutting machine, and finally measured using a vector network analyzer. The comparison between the measurement result of the reflection coefficient and the radiation pattern to their respective simulation results shows that they have a good agreement between each other. With further research and improvements, the size of the antenna tag could be further reduced while maintaining or even improving the performance of the antenna tag

Millimeter wave fifth generation (5G) antenna for smartphone application

In this paper, a single element antenna is designed at millimeter-wave frequency bands for future 5G smartphone applications. The configuration of proposed antenna is multiple L-slots on the ground plane which is designed on a low cost FR4 board. The antenna covers a frequency range between 28 to 35 GHz with a higher bandwidth 4.7 GHz. The antenna shows an excellent performance when integrated with the mobile phone application. The single element antenna exhibits a maximum radiation pattern around 5.945 dBi

Millimeter wave microstrip antenna with CSRR for 5G application

This paper describes the comparison between microstrip antenna and microstrip antenna with CSRR for millimeter wave application. The proposed approach utilized 3 different structures which are a single element, 1×8 array, and 4×4 array. CSRR is applied to the design to increase the number of radiating frequencies. The main advantages of the proposed method are the compact size of the antenna, reduced size, and dual band performance from the antennas. From the simulation work, it is discovered that antennas with CSRR structure has dual band performance and reduced size of antenna patch and substrate

Millimeter wave linear array microstrip antenna with circular CSRR

This paper describes the design and analysis of circular complementary split ring resonator (CSRR) with microstrip linear array antennas. Several improvements that result from the introduction of linear array with circular CSRR such as higher gain, wider bandwidth, and high antenna efficiency. The performance of the antenna is presented using the simulation results obtained from Computer Simulation Technology software. The results show an increase of gain with the increase of element in the linear array from 13.3dB for 1x4 linear array MPA to 16.4dB for 1x8 linear array MPA, 10.6dB for 1x4 linear array MPA with circular CSRR to 12.3dB for 1x8 linear array MPA with circular CSRR. Plus, the total efficiency of antenna ranges from 89% to 91%. The method proposed in this paper can be used to develop a simple and compact dual band millimeter wave antenna

Substrate integrated waveguide antenna at millimeter wave for 5G application

This paper presents a dual-band slot antenna using substrate integrated waveguide (SIW) technology at 26 and 28 GHz. High loss is one of the main challenges faced by 5G base station network due to the severe path loss at high frequency. Hence, high gain antennas are required for 5G base station applications to overcome path loss issue. Hence, this work designs a high gain SIW antenna based on slot technology to excite dual-bands with high gain capability. The antenna is designed with two slots shaped to resonate at two different frequencies: 26 and 28 GHz. The antenna is analyzed using CST software and fabricated on Roger RT5880 substrate with permittivity of 2.2 and lost tangent of 0.0009 with thickness of 0.508 mm. The design operates at 26 and 28 GHz with measured reflection coefficients less than -10 dB. Measured high gains of 8 and 8.02 dB are obtained at 26 and 28 GHz, respectively. Overall, the antenna showed good performance that would benefit the fifth-generation applications

Microstrip Patch Antenna with Luneburg Lens for 5G Applications

International audienceThis paper describes the simulation result on a millimeter wave microstrip patch antenna with Luneburg lens for 5G beamforming application. The proposed design utilized a microstrip patch antenna with complementary split ring resonator at the ground plane feeding a plate Luneburg lens designed to achieve narrow beam (10°) at 28 GHz frequency. The size of the patch antenna is 8 mm × 8mm and produced 0.66 GHz bandwidth with 6 dB gain, and 76% efficiency at the desired frequency. Some of the advantages of the proposed method are the 133.33% increase of radiation gain and the narrow beam output from the lens. However, the structure experiences 19.73% decrease in total efficiency. Then, the number of patch antenna is increased to 5 and the result shows beam overlap at -5 dB. From the result, it is confirmed that the combination of MPA with CSRR and the plate Luneburg lens have narrow beam performance with increased gain. This work could contribute to compact beamforming and beam scanning application in millimeter wave frequency

Multi-Beam Luneburg Lens with Reduced Size Patch Antenna

International audienceThis paper describes the integration of a plate Luneburg lens with a microstrip patch antenna (MPA) with a complementary split ring resonator (CSRR) at 17 GHz frequency. The main advantage of the method is the compact size of the optimized MPA with CSRR such that the radiation pattern of the antennas successfully overlaps at -3 dB. The overlapping is achieved by positioning multiple MPA with CSRR structures around the plate Luneburg lens with 0.408 and lambda; distance between the elements. To test the performance of the lens, CST simulations are carried out using a classical WR62 open-ended waveguide to feed the structure, then adding more waveguides rotated at focal points of the lens. After that, the waveguide is substituted with the MPA with CSRR structure. The superiority of the proposed method over the conventional waveguide or regular patch antenna is confirmed by an overlap in radiation pattern at -3 dB with a narrow beamwidth of 10.9 and DEG;