Folin Oktafiani

Analysis of corrugated edge variations on balanced antipodal Vivaldi antennas

Balanced antipodal Vivaldi antennas (BAVA) with several variations of corrugated edge are proposed and studied for ultra wide band applications. The proposed BAVA consist of three tapered slots with two dielectric substrates in stacking structure. The two tapered slots printed on the top and bottom sides of substrate are the ground planes. The tapered slot printed inserted between the two substrates is the radiator plane. The proposed BAVA is designed and analyzed for 2-20GHz frequency operation with VSWR of less than 2. In order to enhance antenna gain, corrugated edges can be added on the BAVA. Analysis for several variations of the corrugated edges are reported and discussed. They can be used for increasing antenna gain of 2dB while maintaining VSWR of less than 2.

Side lobe suppression for X-band array antenna using Dolph-Chebyshev power distribution

This paper deals with the development of X-band array antenna with side lobe suppression implemented using Dolph Chebyshev power distribution. The array antenna which is fed using proximity coupling is intended to work around frequency of 9.3GHz for frequency-modulated continuous-wave (FMCW) radar application. The proposed antenna array consists of 5 microstrip patch antenna elements deployed on a grounded 0.508mm thick RT/Duroid® 5880 dielectric substrate wherein each antenna element is designed with a slot to obtain 90° rotated linear polarization. From the characterization results, it shows that the array antenna has shows side lobe level (SLL) around 20dB at frequency of 9.3GHz with simulated and measured return loss of 54dB and 30.45dB, respectively. Meanwhile, the simulated and measured gains at frequency of 9.3GHz are 12dBi and 11.39dBi, respectively. The result proves that the array antenna design by using Dolph-Chebyshev power distribution is appropriate for FMCW radar applications compared to the array antenna with uniform power distribution.

Shape enhancement and size reduction of UWB printed monopole antenna

An ultra wideband (UWB) antenna in enhanced shape and reduced size is proposed for investigation and characterization. The proposed antenna which is intended for surface penetrating radar (SPR) application requiring a narrow period pulse is a monopole type antenna and printed on a dielectric substrate. Based on parametrical studies, the octahedral shape is chosen as it is able to enhance the performance as well as to reduce the size of antenna. The antenna is constructed based on a rectangular microstrip antenna fed by a symmetric T-shaped. Some attempts to investigate and characterize the physical parameter including octahedral patch resizing, transition angle, length of arm, and resistive loading are conducted to achieve the required characteristics and the compactness. From the investigation and characterization results, it shows that the proposed antenna which is deployed on FR-4 Epoxy substrate (relative permittivity of 4.3 and thickness of 1.6mm) with a 50Ω microstrip line feeding technique has the overall size of 50mm × 50mm and satisfies with the operating bandwidth required by the application, i.e. frequency range of 50-5000MHz.

Feeding position for determination of horizontal polarization on the marine radar antenna

This paper present an antenna design for marine radar with horizontal polarization. Varying of feeding position for microstrip antenna is proposed to determine a horizontal polarization. This variation is done to obtain the best feeding position so as to allow the antenna to be arranged horizontally. The analysis is carried out by observe four microstrip antennas with different feeding position. The antennas were fabricated on a substrate with a relative dielectric permittivity of 2.2 and a thickness of 0.508mm with 50ohm SMA (Sub Miniature version A) connector as a feeding. The direction of electric field became a parameter to determine an antenna polarization. From the calculation shows the proposed antennas have an operating frequency at 9.3GHZ and horizontal polarization. The best array structure that can be realized is microstrip antenna with slot using feeding line technique.

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.

Analysis of printed patch antenna array for 37 GHz point-to-point wireless links

In this article, a printed patch antenna array for 37 GHz point-to-point wireless links is analyzed. The antenna array consists of five elements with rectangular patch and uniform distribution. It has a compact size of 30.25 × 9.5 mm with operating frequency at 37 GHz that covers future 5G applications. The designed antenna using a substrate with a relative dielectric permittivity of 2.2 and a thickness of 0.508 mm with 50 Ω Sub Miniature version A (SMA) connector as a feeding. The proposed antenna provides a wide bandwidth, directional radiation pattern and high gain.

Modul Antena dengan Susunan Uniform untuk Sistem Antena Radar Generasi Kedua

Pada penelitian ini dilakukan perancangan dan fabrikasi modul antena dengan susunan uniform untuk sistem antena radar generasi kedua. Modul antena yang dirancang terdiri dari empat buah sub-modul yang disusun secara vertikal. Sub-modul terdiri dari susunan delapan patch berbentuk persegi yang diatur sejajar ke arah horizontal dengan metode pencatuan coaxial feed pada titik tengah sub-modul. Setiap patch antena diberi daya yang sama sehingga susunan berbentuk uniform (seragam). Antena dicetak pada bahan duroid dengan nilai er 2,2 dengan ketebalan 1,57 mm. Hasil pengukuran antena menunjukkan bahwa antena dapat bekerja pada frekuensi 9,4 Ghz dengan nilai VSWR (Voltage Standing Wave Ratio) ≤1,5. Gain antena yang didesain sebesar 20.08 dBi dengan beamwidth horizontal 10˚ dan beamwidth vertikal 20˚.

Analysis of coupling between antenna elements for flare angle determination in dual pulses GPR antenna

GPR (ground penetrating radar) survey to locate objects of unknown depth requires more than one type of pulse duration means using a number of antenna with different length. GPR antenna prototypes for two of the most optimum pulse is proposed dipole antenna consists of two pairs of antennas, each of the main antenna (short-length) of the feed point to bending (discontinuity) is equal to 3 cm and 6.5 cm for the main antenna (long-length). Model analysis for the coupling between the arms of the antenna mutual impedance analysis using two dipole orientation angle. Flare angle of 70 degree angles show mutual impedance lowest. This is consistent with FDTD (finite difference time domain) simulation results that the lowest coupling occurs at a flare angle of 70 degree.

Square notch ground plane binomial chebyshev for maximum main lobe frequency 9.3 GHz radar application

In this paper, was developed on how to increase the difference between the main lobe to the side lobe antenna, because if the side lobe antenna is very large, will lead to a huge influence on the performance of object detection by the main lobe. With side lobe magnitude would be no confusion, and detecting the wrong object. In this paper the authors do modification method development, by adding a notch on the side of the ground plane, resulting parameters are very nice and can be used in radar applications. With VSWR produced by 1,004, return loss of -54 dB, and the difference between the main lobe and the side lobe by 25, 74 dB. Designed antenna at a frequency of 9.27 GHz-9.33 GHz.

Performance enhancement of microstrip patch antenna by incorporating exponential-square patch model

A microstrip exponential-square patch antenna have been proposed and simulated in this paper. It consists of an exponential-square patch, a substrate, a square ground plane and probe feed. The exponential-square patch shape is modified from conventional square geometry with two parallel side replaced by two exponential curve. From simulation results, it is shown that microstrip exponential-square patch antenna has wider bandwidth, lower return loss, higher gain, within same radiation pattern and same beam width compared to conventional microstrip square patch antenna. The proposed antenna is designed and simulated at 3 GHz frequency operation suitable for S-Band radar application.