In this research, Airborne broadband (maximum 400 MHz bandwidth) C band circularly polarized synthetic aperture radar (SAR) is proposed and developed for further study on airborne compact polarized synthetic aperture radar (CP SAR) system using circular polarization. This paper explains the scattering characteristic of circular polarization as the concept of Circularly Polarized SAR, system configuration, RF system and antenna, ground test, and flight test of Circularly Polarized SAR in Hinotori-C2 (Firebird-C2) mission onboard CN235MPA aircraft on 14-15 March 2018 at South Celebes, Indonesia. The result of the flight test depicts multipath full polarimetric circularly polarized images that show good performance of Circularly Polarized SAR and matched well to the result of the ground test of a multi polarized single pulse. The Circularly Polarized scattering clarification using trihedral, cylindrical, and Omni corner reflectors (TCR, CCR, and OCR), assessment of Circularly Polarized image analysis, and image classification using the conventional axial ratio (AR), ellipticity (ε), and polarization ratio (ρ) is discussed. The proposed Circularly Polarized SAR will enrich the existing CP SAR systems and could be employed in further study of CP SAR calibration technique, also applications development for the environment and disaster monitoring using CP SAR.

The main problem in designing a multiband bandpass filter (BPF) is making each passband response highly independent, where each bandwidth of multiband BPF can be controlled and adjusted separately. To overcome this problem, this paper proposes a highly independent multiband BPF based on a multicoupled line stub-SIR with a folding structure. The proposed multiband BPF is constructed as a multicoupled line to generate a highly independent inter passband. Moreover, the multiband performance is produced separately and independently by using three sets of resonators: resonator A1/A2 (RA1 and RA2), resonator B1/B2 (RB1 and RB2), and resonator C1/C2 (RC1 and RC2). The three passband frequencies can be independently arranged and designed. To miniaturize the multiband BPF, a folding structure is also proposed. As a result, the multiband BPF has a compact size that is reduced by over 61.29 % compared to previous structures. The even-odd excitation model and the equivalent circuit model are used to analyze the multiband BPF structure. This BPF is designed for GPS applications at 1.57 GHz, WCDMA (3G) at 1.8 GHz, WLAN (WiFi) at 2.4 GHz, LTE (4G) at 2.6 GHz, and 5G communication at 3.5 GHz. To evaluate and validate the proposed structure of the multiband BPF, the circuits are fabricated and tested. The simulated and measured results of the multiband BPF show good agreement. In conclusion, the proposed multiband BPF structure has a highly independent inter passband response and a compact size.

Since 1 June 2016, the national power utility company (PLN) Bali has been launced Bali Eco Smart Grid to support Bali Clean and Green Bali Province Program. To improve customer service and efficiency program, PLN Bali introduce advanced metering infrastructure (AMI) by implementing 2 ways smart meter based on low range wide area network (LoRa WAN) as replacing pre- and postpaid existing digital meter. LoRa WAN technology is selected as the suitable among low power WAN (LPWAN) technologies after evaluating based on Indonesia regulation covering frequency allocation and license, devices availability, cost, and implementation method. PLN Bali deploy 1,000 2 ways smart meter based on LoRa WAN at Kuta area. It can be seen from the implementation test results that 2 ways smart meter based on LoRa WAN can be operated on both pre- and postpaid models properly, gave 100% satisfaction to all customers, gave 100% success meter reading rate, perfect control accuracy, investment cost efficiency of 60% and operational cost to 90% It is recommended that 2 ways smart meter based on LoRa WAN can be deployed to all customers in PLN Bali.

Non-orthogonal multiple access (NOMA) is a multiple access technology that can provide efficient spectrum utilization and increased channel capacity on Internet of Things (IoT) networks. One factor affecting NOMA system performance in the IoT network is the allocation of power for each NOMA user. To improve the channel capacity of the system, this paper presents a method for optimizing power allocation for NOMA in an IoT network with a Lagrange multiplier using the Karush-Kuhn-Tucker (KKT) condition. The optimization will result in an optimal power allocation solution to maximize the system channel capacity with the maximum transmit power constraint function and the minimum data rate for NOMA users. The channel capacity achieved by the system was observed in the Nakagami-m fading channel with imperfect successive interference cancellation (imp-SIC). The proposed power allocation method was compared with orthogonal multiple access (OMA) and the conventional NOMA (C-NOMA) power allocation techniques. The results show that the proposed power allocation coefficient optimization solution with the Lagrange multiplier using the KKT conditions significantly increases the channel capacity of the system compared to the OMA and C-NOMA methods.

Traditional electricity meters read manually, large workloads, major errors and distributed at different installation locations, need to spend a lot of time and labor costs. In real-time, the accuracy and extension of the application cannot be fulfilled. With technological developments, electric meters now can be used both ways, for real-time remote reading, and can be used as prepaid and postpaid, making it smart meter. Currently the smart meter has become an important part of the smart grid system. Therefore, the national power utility company (PLN) Bali region decided to replace the existing meter with smart meter to support Bali Eco Smart Grid. Long Range (LoRa) wide area network (WAN) is the access technology that used for implementing smart meter because it has benefits including can reach long distance, low power, and lower cost. This study aims to analyze the techno economic smart meter 2 ways implementation at Bali region by using techno-economic method and cost-benefit analysis. In addition to analyze technological and economic aspects, the business model and the regulatory aspect analysis are also included. The results show that LoRa WAN is one of the technology options that can be used today, the business model that can be used is build own or implementation is done by itself, build operate transfer (BOT) or outsourcing to third party, and rental model. According the ministry of communication and information regulation number 35/2015, LoRa WAN that operate at frequencies 923-925 MHz can be implemented to support smart meter implementation by Bali PLN.