Yuyu Wahyu

Small antenna using transmission line uniform for X-band navigation radar

In this research, a co-planar antenna with a small dimension is presented for vessel navigation radar. The radar, will be produced in a compact size so that it can be used at any type of vessels. The small antenna was fabricated on Duroid series 6006 with a permittivity value εr of 6.15. This enables a production of smaller antenna dimension, in comparison to the dimension of our antenna from the previous researches. The frequency center of the antenna is 9.4 GHz. The antenna will be implemented in a uniform configuration consisting of 16 modules for transmit and receive parts to achieve an equal phase. The simulated and measured results show similarity in performance. The overall antenna dimension is 40 cm × 0.27 cm, while it was 1600 cm × 10 cm in the previous design.

Antenna co-planar array of X-band frequency 9.4 GHz for radar

In this paper, carried out research on the development of radar antenna for X-band, with a resonant frequency of 9.4GHz. Antenna designed using coplanar array, the module is designed radiating patch of 4, 4 co-planar patch on the left side of the main and 4 co-planar on the right side of the main patch. Bandwidth resulting from the simulation is 677.8MHz, at a frequency of 9.0815GHz - 9.7953GHz. In the realization of Bandwidth is 419MHz. The resulting simulated VSWR at a frequency of 9.4GHz is 1.0256 and 1.056 for the realization of results. The resulting gain is 13.38dBi for simulation, and 14.1dBi for realization.

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.

Enhancement performance tapered slot vivaldi antenna for weather radar application

Tapered slot vivaldi antenna is an antenna type that has a very wide bandwidth. With that performance, tapered slot vivaldi antenna can cause interference if it is applied on a weather radar that requires a fairly narrow bandwidth only. Therefore, this paper will discuss the design and simulation to narrow bandwidth of the tapered slot vivaldi antenna in order to provide good performance when applied for weather radar that operates at 9.4 GHz. Design and simulation uses CST Microwave Studio software by varying its dimension. From simulation has been obtained vivaldi tapered slot antenna bandwidth narrowed down to 13% at frequency operation, while other antenna parameters still meet to the weather radar antenna requirement.

Development of phase inverter for performance improvement of FM-CW radar

In this paper, development of a phase inverter module for FM-CW (frequency modulated continuous wave) Radar is presented. The development is performed in the form of a design and simulation based on the theory of Samuel Y. Liao [2] and Tamasi Moyra et.als research for J mode phase inverter [6]. In a FM-CW Radar, two parallel separate antennas are used for transmitting and receiving signals simultaneously. Side lobes from both antennas are interfering with each other. This creates false detection at the receiver. To overcome this problem, a phase inverter is needed to remove interfering signals from the transmit antennas side lobes at the receiver. The phase inversion is performed for 180 degree phase shift (λ / 2) between the TX and RX signals. Experiments were conducted for developing phase inverter based on J, T, Y and # junction methods. Based on the calculations and simulations for the J-junction method, S11 of -22.2 dB and S14 of -43.475 dB (return loss), S12 of -4 dB and S13 of -3.34 dB (insertion loss output) were obtained, while phases S12 of 147° and S1 of -123°. For T-junction, S11 of -24.86 dB and S14 of -23 dB (return loss), S12 of -2.8 dB and S13 of -4.7 dB (insertion loss output) were obtained with phases S12 of 133° and S1 of -133°. Y-junction produces S11 of -25.86 dB and S14 of -25.989 dB (return loss), S12 of -3 dB and S13 of -5 dB (insertion loss output) with phases S12 of 65° and S1 of -23°. The #-junction creates S11 of -17.08 dB and S14 of -25.81 dB (return loss), S12 of -4.17 dB and S13 of -3.5 dB (insertion loss output) with phases S12 of 128° and S1 of -143°. Based on the results of designs and simulations, the phase inverting of 180° can be obtained more precisely by using the T- junction. The phase inverting using this T-junction achieves the best performance and will be implemented for our Radar antennas.

Modified sierpinski patch antenna with co-planar waveguide feed for multiband wireless applications

In this paper, a modified fractal sierpinski patch antenna suitable for multiband wireless application is proposed. Various heights of a triangle component in sierpinski antenna are compared to achieve the desired resonant frequencies and then a coplanar wave guide feed is used to achieve more multiband resonant frequencies within 0-7 GHz frequency range. Return loss characteristics suggest that the antenna is suitable for WLAN, Wimax and also GSM bands for VSWR<;2. Bandwidth measurement based on VSWR=2 for 900 MHz is 245 MHz, at 2.4 GHz is 620 MHz, at 3.3 GHz is 1020 MHz , and for 5.8 GHz is 400 MHz.

Design and realization of archimedes spiral antenna for Radar detector at 2–18 GHz frequencies

In this paper, a realization of archimedes spiral antenna for a Radar detector is presented, where this Radar detectors are used to detect Radar signal transmission within the frequency range of 2-18 GHz. In this research, an antenna was designed for the above information band. Multiple frequency bands covered by this antenna S band (2-4 GHz), C band (4-8 GHz), X band (8-12 GHz) and Ku band (12-18 GHz). The designed antenna has a shape of a spiral with a diameter of 5 cm. The antenna was implemented on a Roger Duroid 5880 substrate with εr = 2.2, thickness of 0.787 mm, and 1 oz for copper cladding. These spiral antennas have ultra wideband characteristics due to the planar structure and circular polarization with impedance of 188 Ohm. From the simulation results of the designed antenna, we obtained VSWR of 1.1 up to 1,27, a gain ranging from 3 to 6 dBi, with 3dB bandwidth of 61.7 degree. There is a similarity between the measurements and the simulation results. The realized antennas show advantages, e.g., VSWR <;2 and high gain, compared which the existing antennas in the market.

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 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.