Endon Bharata

• Master of Engineering
• Bandung Institute of Technology

Since August 2003 the International Research Centre for Telecommunications and Radar (IRCTR), Delft University of Technology (TU Delft), The Netherlands, and the Microwave and Radio Telecommunication Laboratory, Dept. of Electrical Engineering, Bandung Institute of Technology (ITB), Indonesia, have been collaborating in a research project on develo...

In this work an improved ultra-wideband (UWB) radiator for short-range ground penetrating radar (GPR) applications has been developed in joint research collaboration between IRCTR-Delft University of Technology, The Netherlands, and Bandung Institute of Technology (ITB), Indonesia. The developed radiator shows improved features in comparison with c...

In this paper, the development of wideband printed dipole antenna which is fed using modified planar Marchand balanced-unbalanced (balun) circuit is presented. The antenna is intended to operate at frequency of 3.3GHz with wideband response for wireless application. A modified planar Marchand balun is chosen to transform an unbalanced circuit of co...

This paper presents the design of microstrip array antenna for 3.3GHz WiMAX (Worldwide Interoperability Mobile Access) application. The proposed antenna comprises of 16 rectangular patches with microstrip line feeding network established using a quarter-wavelength transformer impedance matching technique. To avoid grating lobes affected by the spac...

In this paper, the development of a self oscillating mixer (SOM) as part of a low noise block (LNB) for a satellite television receiver is investigated numerically and experimentally. In contrast to other mixers, the developed SOM requires no separate local oscillator as it generates own local oscillator signal. The SOM is developed using a monolit...

Data acquisition speed is an inherent problem of stepped-frequency continuous-wave (SFCW) radars, which may discourage further usage and development of this technology. We propose an emerging paradigm called compressed sensing (CS) to overcome this problem. In CS, a signal can be reconstructed exactly based on only a few samples below the Nyquist r...

We present a design of a stepped-frequency surface penetrating radar for through-wall applications. The radar should work on 1500 – 3000 MHz, giving a total bandwidth 1500 MHz. The radar will have range resolution of 4,33 cm, maximum unambiguous distance 22,168 m, and the number frequency step is 512. Simulation with SystemVue confirms the implemen...

The analysis, design, and realization of a modified bow-tie antenna optimized for impulse ground penetrating radar (GPR) applications is described. The proposed antenna shows improved properties important for GPR, which include its compact size (in comparison with a conventional bow-tie antenna) and ability to radiate UWB pulses with increased ampl...

In this paper the traditional tapered microstrip balun transformer is modified by bending its whole structure to significantly reduce its length. The resulting bent tapered microstrip balun is then extended with a twin-semirigid line to simplify antenna feeding. The decoupling coefficient of the proposed balun has been found to be smaller than -30...

For impulse GPR it is generally required that the antenna have sufficiently large bandwidth and a constant phase center. The former is needed to allow transmission of UWB transient pulses with suppressed late-time ringing to avoid masking of targets. Resistive loading has always been the most popular loading scheme in this application as it can eas...

Data acquisition speed is an inherent problem of the stepped-frequency continuous wave (SFCW) radars, which discouraging further usage and development of this technolo-gy. We propose an emerging paradigm called the compressed sensing (CS), to manage this problem. In the CS, a signal can be reconstructed exactly based on only a few samples below the...

In a stepped-frequency continuous wave (SFCW) radar, instead of sending out impulses, the system transmits a set of frequencies covering radar's bandwidth. Based on the measurement data of the reflected waves, it then reconstructs a time-domain waveform through inverse Fourier transform. This paper proposes a method to select the best set of freque...

In this paper a rolled dipole antenna for low-resolution impulse ground penetrating radar (GPR) is theoretically and experimentally investigated. The antenna has been designed for transmission of monocycle pulses with duration of 5 ns (200 MHz central frequency) suitable for low-resolution GPR applications. The dipole is rolled to considerably redu...

This paper describes the GPR antenna test facility developed at the research branch of IRCTR at ITB Indonesia called IRCTR Indonesian Branch (IRCTR-IB). The facility consists of a GPR test range, a PC-controlled scanner, a UWB sensor, and measuring equipment. The test range was constructed as a wooden sandbox of 3 m × 3 m × 1.6 m and filled with...

In our previous works we developed an improved UWB bow-tie antenna for high-resolution GPR applications. The antenna has been designed to detect small shallow-buried objects for which it should be able to transmit short pulses with very small late-time ringing. It has been shown theoretically that in comparison with conventional bow-tie or dipole a...

This paper proposes a new sampling scheme for the design of stepped frequency continuous wave (SFCW) radar. Our proposition is that given any impulse waveform, there will be an optimum frequency sampling scheme, according to minimum mean error criteria. The optimum scheme implies that the frequency spacing will generally non-uniform, where the unif...

This report contains the results achieved in the project “Extension of the Cooperative IRCTR-ITB Research Project on GPR Antennas,” which was carried out in the period of September 1, 2005 until September 1, 2006. The project is the second collaboration between IRCTR – Delft University of Technology, The Netherlands, and Microwave and Radio Telecom...

In this paper a rolled dipole antenna for low-resolution impulse ground penetrating radar (GPR) is theoretically investigated. The antenna is designed for transmission of monocycle pulses with duration of 5 ns (200 MHz central frequency) suitable for low-resolution GPR applications. The dipole is rolled to considerably reduce it length and resistiv...

This report presents the results of mutual coupling measurements between two identical antennas for high-resolution impulse ground penetrating radar (GPR). The considered antennas are UWB modified bow-tie antennas, developed in our previous work [1]-[5]. For bistatic GPR systems, mutual coupling between transmit and receive antennas should be very...

The work reported in this paper is a result of research collaboration between IRCTR – Delft University of Technology, The Netherlands, and Bandung Institute of Technology (ITB), Indonesia. This work focuses on development of an improved antenna for short-range impulse ground penetrating radar (GPR) applications in which the targets are shallowly bu...

In this paper, development of an improved antenna for short-range ground penetrating radar (GPR) applications s discussed. the antenna improvement is obtained in the form of increased radiation efficiency and reduced dimension. In addition, an improved metallic shield has been designed not only for protection against EMI and antenna coupling, but a...

The paper describes an ultra-wideband (UWB) antenna developed for impulse ground penetrating radar (GPR) applications. The antenna is a modified bow-tie antenna designed for short-range GPR applications such as road inspection and non-destructive testing of concrete. For these applications, the transmitted pulses should have minimal ringing to avoi...

The IRCTR, Delft University of Technology (TU Delft), Netherlands, and the Bandung Institute of Technology (ITB), Indonesia, have been collaborating in a research project on the development of ultra-wideband (UWB) antennas for ground penetrating radar (GPR) applications. In the research, a facility for UWB antenna measurements in the time domain is...

rt-range impulse ground penetrating radar (GPR) applications, carried out in joint research collaboration between IRCTR – Delft University of Technology, The Netherlands, and Bandung Institute of Technology (ITB), Indonesia. The developed antenna has been designed to give improved features in comparison with commonly-used UWB radiators, such as res...

In this paper the design of an UWB antenna for short-range impulse GPR applications is presented. The antenna consists of an UWB radiator and a metallic shielding. The radiator is based on a modified bow-tie antenna that in comparison with conventional bow-tie antennas shows improvement in the form of higher radiation efficiency and reduced dimensi...