Arief Budi Santiko

Compact Power Divider Integrated with Coupler and Microstrip Cavity Filter for X-band Surveillance Radar System

This paper present the compact power divider integrated with coupler and microstrip cavity filter for x-band surveillance radar system. These modules consist of several devices (splitter, filter and coupler) it is integrated in a single module aims to reduce the loss in the joint connectors. The bandpass filter is use microstrip cavity filter for operating on X-Band Frequency and deployed on RT/duroid 5880. The power divider and coupler is designed using quarter wavelength transformer. A theoretical analytical circuit model will be presented, from the theoretical model, a compact integrated module will be designed and simulated. The proposed compact integrated module is small in dimension and performs a compact size. The compact integrated devices design on X-Band frequency is simulated and the result is presented.

Design of a dual band power divider using meander line technique frequency 4928 MHz and 9856 MHz for radar application

The dual band devices its a some technique made a optimal at a desire frequency with specific technique such as dual impedance and step impedance. This paper presents design of dual band Wilkinson power divider using dual impedance transmission line with stubs. The design is modified using meander pattern to reduce the size of the device. The proposed design was simulated using software ADS 2011.10 and using a substrate Roger Duroid 5880. In this WPD, two branches of impedance transformer and the output ports are shunted with a resistor (R). Simulation results of this WPD design are shown by the graphs of insertion loss (S<inf>21</inf> and S<inf>31</inf>), return loss both of input and output (S<inf>11</inf>, S<inf>22</inf> and S<inf>33</inf>) and also isolation between the output ports (S<inf>32</inf>). The simulation shows the insertion loss (S<inf>12</inf> and S<inf>13</inf>) − 3.17 dB at frequency of 4928 MHz and −4.1 dB at frequency of 9856 MHz. The isolation (S<inf>32</inf>) is less than −21 dB at frequency of 4928 MHz and less than −27 dB at frequency of 9856 MHz. The input return loss (S<inf>11</inf>) is less than −16 dB at frequency of 4928 MHz and less than −15 dB at frequency of 9856 MHz. The output return loss (S<inf>22</inf> and S<inf>33</inf>) are identical where less than −17 dB at frequency of 4928 MHz and −22 dB at frequency of 9856 MHz. A satisfactory agreement based on the simulation results, this dual band WPD have a good and acceptable insertion loss and isolation, and also produce a better return loss of input and output ports for operating on the both frequencies of 4928 MHz and 9856 MHz.

Design and realization multi layer parasitic for gain enhancement of microstrip patch antenna

Microstrip antenna has a small gain, bandwidth and efficiency. To overcome those weaknesses, this paper focused on a design of multilayer parasitic substrate for enhancing antenna gain. The distance between first layer parasitic and second layer parasitic had been optimized to maximize electromagnetic coupling and improve antenna main lobe. The microstrip antenna had been fabricated using FR-4 epoxy substrate with 4.2 dielectric constant. Measured antenna acquires unidirectional radiation pattern, 70° beamwidth azimuth, 2.333 GHz–2.377 GHz of operating frequency at VSWR ≤ 2, 44 MHz of bandwidth, and Gain = 4.64 dB. The dimension of realized antenna was 151.5 mm × 151.5 mm. This antenna was purposed to work for LTE band 40 at 2.35 GHz.

Performance of microwave absorbers with fabric form in S-band operational frequency

Microwave absorbers are effective for protecting and reducing electromagnetic-wave reflection to solve electromagnetic interference (EMI) in communication and sensing applications. In this paper, we report and discuss performance of microwave absorbers with fabric form in operational frequency of S-band. The absorber consists of knitted metal wired with small and thin structures. It has lightweight, flexible, and transparent characteristics. Based on the structure, the absorber can be operated to overcome electromagnetic-wave noises in microwave electronic devices. In order to know the performance of the microwave absorbers, the reflection characterization of the absorbers is analyzed. As the results, the microwave absorber can be operated in S-band regions with reflection loss of −0.357 dB at 3.2 GHz frequency.

Design and realization of circular patch antenna for S-Band Coastal Radar

In this paper, a design and realization of a coastal radar antenna that works on S-Band frequency was presented. Type of antenna that had been used in this research is a microstrip patch antenna. One antenna module consist of eight patch that was horizontally arranged. The microstrip antenna had been fabricated using FR-4 epoxy substrate with 4.6 dielectric constant and a thickness of 1.6mm. Measured antenna acquires unidirectional radiation pattern, 16° beamwidth azimuth, 2.93 GHz – 3.093 GHz of operating frequency at Voltage Standing Wave Ratio (VSWR) ≤ 2; 166 MHz of bandwidth and Gain = 11.98 dB. There was a satisfactory agreement between simulation and measurement result. This circular patch antenna will be implemented for S-Band Coastal Radar.

Design and implementation of three branch line coupler at 3.0 GHz frequency for S-band radar system

This paper presents design and implementation of three branch line coupler (3-BLC) at 3.00GHz Frequency. The implementation 3-BLC is used for phase inverter to reduce the interfering of the side lobs antenna in FM-CW Radar that two antenna (TX-RX) installed parallel separated. The proposed design was simulated and fabricated using a low cost Fr4 epoxy substrate with 4.5 dielectric constant, thickness of substrate is 1.6 mm. Simulation and measurement result shown as graph that contains return loss (or VSWR), insertion loss and isolation. The simulation and measurement result have a good result where VSWR value is below 1.3 for all ports. The direct port (S12) of -7.38 dB, coupler (S13) of -2.25 dB and Isolation (S14) of -21.5 dB. A satisfactory agreement between on the simulation and measurement results, this 3-BLC have a good and acceptable direct port, coupler and isolation, and also produce a better return loss of input and output ports for operating on 3.00 GHz.

Desain dan Realisasi Antena Mikrostrip Patch Persegi Susunan Linier dengan Teknik Pencatuan Proximity Coupled pada Frekuensi 4 ,3 GHz untuk Radio Altimeter Pesawat

Pada penelitian ini telah dilakukan perancangan, simulasi, dan realisasi antena mikrostrip array dengan catuan proximity coupling untuk aplikasi radio altimeter. Penentuan nilai dimensi antena dilakukan dengan menggunakan rumus-rumus antena mikrostrip. Nilai-nilai dimensi yang telah diperoleh kemudian disimulasikan dengan simulator elektromagnetik untuk memperoleh performansi yang dihasilkan. Selain itu, proses simulasi juga digunakan untuk mengoptimasi desain antena. Antena yang dirancang mampu bekerja pada frekuensi 4,3 GHz, dengan return loss < -10 dB, VSWR < 2, bandwidth 100 MHz, gain ≥ 9,25 dBi, pola radiasi unidirectional , dan polarisasi linier. Substrat yang digunakan adalah Rogers RT5880 yang memiliki permitivitas relatif sebesar 2,2 dan ketebalan sebesar 1.57 mm. Antena yang terealisasi bekerja pada frekuensi tengah 4,3 GHz yang menghasilkan VSWR 1,005, polarisasi elips, gain 13,46 dB, pola radiasi unidirectional , impedansi 50,113 - j228,123 mOhm, return loss -51,890 dB, dan effective bandwidth 286 MHz (4,175-4,461 MHz).