Wide Band Open Ended Air Gap RLSA Antenna at 26GHz Frequency Band

RLSA antenna is a popular candidate for many applications such as Direct Broadcast Satellite Reception, Point to Point Microwave Link, RFID and Wimax Application. This is due to its capability of carrying high speed signal with high directivity characteristic and capability of beam steering and beam shaping. This paper will introduce the RLSA antenna designed at the frequency of 26 GHz for wireless backbone application. The antenna design was utilize open ended air gap as a separator between radiation surface and ground plane. The open air gap cavity structure normally implemented in broadband planar antennas. This structure normally provide a wide bandwidth and good return loss on the desired frequency. Therefore, an investigation of this technique and hybrid with FR4 board as a cavity material will be very interesting due to condition of easy to manufacture, lighter the antenna weight and durable. The model of RLSA antenna at 26GHz has been simulated. The results obtained a -25dB of reflection coefficient, 23.68dBi of directivity gain with wide antenna bandwidth capability. This research found an opportunity of utilizing RLSA antenna concept for extreme high frequency band application

Wide Band Open Ended Air Gap RLSA Antenna at 5.8GHz Frequency Band

RLSA antenna is a popular candidate for the application of Point to Point Microwave Link. This is due to its capability of carrying high speed signal. RLSA prototypes has been designed and developed at the frequency range of 5725 – 5875 MHz by few researchers. The classic design was using enclose air gap as a separator between radiation surface and ground plane. Then, the slow wave material has been used in the RLSA cavity. The implementation of FR4 board to RLSA design recently has allowed a reconfigurable and beam shaping of radiation pattern.[5]. The open air gap cavity structure normally implemented in broadband planar antenna.[6] This structure normally provide a wide bandwidth and good return loss on the desired frequency. Therefore, an investigation of this technique and hybrid with FR4 board as a cavity material will be very interesting due to condition of easy to manufacture, lighter the antenna weight and durable.[7

Radial Line Slot Array Antenna Development in Malaysia

The Radial Line Slot Array (RLSA) antennas become more popular due to its good characteristics such as low profile, low cost, aesthetically pleasing, ease of installation and simple structure. Many researchers have contributed to the development of RLSA antennas. This antenna started with the name of annular slot antenna designed by Kelly and Goebel in 1960’s. In 1980’s, the researchers from Japan have innovated this idea and proposed a new concept of radial slot planar antenna names Radial Line Slot Antenna. From here, many researches have been carried out involving researchers around the world. Researchers from Malaysia also involves in the development of RLSA antenna. The RLSA antenna research in Malaysia focuses on application that suitable to RLSA characteristic. Those applications are Direct Broadcast Satellite Reception, Point to point Microwave Link for Fixed Broadband Wireless Access and RFID. This paper will be focus on RLSA antenna development started with the history, research outcomes and the research focus in Malaysia

Inventory risk based technique for spare parts utilization

The equipment breakdown due to unavailability of spare parts has incurred challenges for the manufacturing industry in managing the inventory. Consequently, the problem of spare parts unavailability has lead the organization towards unproductive and eventually impact the financial performance.Therefore, maintaining good system has direct connection with spare parts availability. The inventory planner always strive hard to ensure that the spare parts are always available for the maintenance used.Nevertheless, maintaining high inventories of spare parts often conflict from meeting the needs of equipment reliability for the manufacturing plant.In view of this situation, management of spare parts become critical in ensuring the equipment reliability.This paper describes an innovative risk quantification technique using Binary Decision Diagram (BDD) for the spare parts inventory control.The technique modified the BDD concept by translating the failure history into binary decision.From the binary process, the data will be converted into spare parts probability table and failure impact is analyzed. These two functions of risk, will be calculated in order gain the risk in monetary value

Performance analysis of Ultra-wideband RF switch using discrete PIN diode in SC-79 package for medical application of microwave imaging

Microwave imaging is an emerging technology in the medical application which have similar functions as X-ray, Magnetic Resonance Imaging (MRI), and Computed Tomography scan (CT scan). In designing a microwave imaging system for medical application, it can use a monostatic radar approach by transmitting a Gaussian pulse (with an ultra-wideband (UWB) frequency). In this system, eight antennas are required with the support of RF switches. Thus, it is important to get the best performance of UWB RF switch in this application. Therefore, this paper presents the performance analysis of four different RF switch topologies (Design 1, 2, 3 and 4) using discrete PIN diode in SC-79 package. The design was based on single pole double throw (SPDT) switch. As result, Design 2 is the best topology after considering the tradeoff between isolation and return loss performances. Based on the three cascaded SPDT switches of Design 2, the insertion loss was less than -2 dB and return loss was more than -10 dB. Meanwhile, the isolation bandwidth (at the minimum isolation of -20 dB) was from 0.5 to 3.7 GHz (with 3.2 GHz bandwidth), hence, it could be used in the UWB frequency for medical application of microwave imaging

Compact V-Shaped MIMO Antenna For LTE And 5G Communications

A new small V-shaped MIMO antenna with dimensions of the antenna 21 × 24 × 0.8 mm within the bands of (4.4-4.9) and (5.15-5.925) GHz was designed, and the fabrication and measurement outcomes derived from the use of the MIMO prototype revealed that the fractal MIMO antenna. The small and simple fractal antenna demonstrated high isolation of less than -18.5 dB and envelope correlation coefficient less than 0.05. These attributes are suitable for mobile, which is being introduced into Japanese markets

Design Aspects of WINDS Ground Facility for Malaysia

The paper demonstrates the design aspects of Malaysian Ground Facility proposed to be established for the beam allocated at II. OBJECTIVES N3.14 latitude and E101.68 longitude in Ka-band by using WINDS (Wideband nterNetworking engineering test and Demonstration Satellite), which is currently under joint One of theimain oevesois o Carry o a development, by JAXA and the National Institute of Information experiment on Application development of e-learn,mg by and Communications Technology, Japan.181 Connecting University Technical Malaysia, Malacca Campuses via WINDS system and later connecting to other The purpose of the proposed ground facility is to test validity participating organizations in Japan, Thailand and Malaysia.and usefulness of Ka-band technologies related to large-capacity The other objectives include the development of WINDS data communications to promote the use of satellites in Malaysia Ground Station: for Radio Propagation Studies for Malaysia's for multimedia applications in such fields as Internet Environment, Electromagnetic Interference and Compatibly communications, Tele-education, Tele-medicine, Tele- Analysis in Ka-band. And Verification and Validation of Kanetworking,Tele-working, disaster measures and Intelligent band Technology at ultra sped data rate for Disaster Transport Systems (ITS) on non-commercial basis. [8

Compact V-Shaped MIMO Antenna For LTE And 5G Applications

A compact sierpinski MIMO antenna was designed in the bands of 4.4 - 4.9 GHz and 5.15 - 5.925 GHz.The proposed dimension of the antenna were 21 × 24 × 0.8 mm, and was fabricated with inexpensive FR4 substrate with a thickness of 0.8 mm, a dielectric constant of 4.3, and 0.035-mm thick copper lining. The fabrication and measurement outcomes derived from the MIMO prototypes revealed that the proposed MIMO antennas are better in terms of size, isolation and the ECC. These attributes are suitable for LTE and 5G smartphone applications, which are being introduced into Chinese and Japanese markets