P. Daud

A compact X-Band bandpass filter using rectangular split ring resonators for radar applications

We propose and discuss a compact bandpass filter in coplanar waveguide (CPW) loaded with rectangular split-ring resonators (SRRs). The proposed device is designed on a planar structure where the rectangular SRRs and CPW are arranged in the different side. Basic characteristics of the proposed device such as 2-factor, insertion loss, and out of band rejection are considered for X-Band radar operation. Analysis of rectangular shape of SRRs on filter performance is done with emphasis on coupling between adjacent SRRs. The proposed device has a small size which is good for miniaturization and has promising feature for applications in X-Band radar transceiver module. It can be easily fabricated by using standard photo-etching techniques.

Inset-fed U-slotted patch antenna array for 10GHz radio-over-fiber applications

The increasing need for telecommunications, optical telecommunications networks in developed as well developing the functionality of radio waves with light waves in a Radio over Fiber network. On the network needed an antenna to support the process of receivers pick up radio waves then modulated with light waves. Antennas on Radio over Fiber can work at a frequency of 10 GHz WPAN communications. Wireless frequencies captured by the antenna can then be directly modulated and distributed through an optical fiber in accordance with needs. Antenna characteristic which must be met including small size, have a good level of matching, only consume little electric current, and has a unidirectional radiation pattern. In this paper, using an electromagnetic simulator, designed and simulated arrayinset fed rectangular microstrip antenna with U-slot for Radio over Fiber applications in WPAN communications that can be used optimally at a frequency of 10 GHz. The simulation results with optimum performance further implemented and observed at a frequency of 10 GHz performance. Results from the design and realization are patch arrayrectangular microstrip antenna with U-slot working at a frequency of 10 GHz with unidirectional radiation pattern; ≥ 3dBi gain; input impedance = 50Ω; and VSWR ≤ 1.5.

Environmental liquid waste sensors using polymer multi-coupled ring resonators

High sensitivity environmental sensors with a simple and compact structure are required to monitor unwanted pollution such as liquid waste. In this paper an environmental sensor liquid waste using a polymer multi-coupled ring resonator (MCRR) structure is proposed. The proposed structure consists of polymeric materials on silicon substrate. Also discussed the influence of different refractive index values for the cover region to ligthwave transmittance in the structure designed. The transmitance value at the same wavelength lightwave operations between them are different, meaning that the proposed device can be used for identifying the difference of liquid material.

Optical fiber and microwave wireless up-links using EO modulator with planar stripline feed to gap-embedded patch-antennas

Microwave wireless and optical fiber technologies are widely used for several applications in communication, sensing, imaging, and so on. We propose an electro-optic (EO) modulator with a planar stripline feed to a gap-embedded patch-antenna for hybrid uplinks to an optical fiber and microwave wireless networks. The proposed device is designed on an EO crystal with simple and compact structure. The gap-embedded patch-antenna on the EO modulator can be operated for optical modulation to the optical fiber network. The proposed device can be also operated for microwave transmission to the air or wireless networks. Characteristic and analysis of the designed device for optical modulation and wireless microwave transmission are reported and discussed.

Design of optical channel waveguide Mach-Zehnder interferometer (MZI) for environmental sensor applications

High sensitivity environmental sensors with a simple and compact structure are required to monitor unwanted pollution such as liquid waste. In this research, a component of environmental sensor based on optical channel waveguide Mach-Zehnder interferometer (MZI) has been designed and also simulated. The materials used in the design were titanium dioxide (TiO2) as a core and silicon dioxide (SiO2) with air as cladding. The sensitivity value of the MZI sensor obtained by simulation using computer program was 11 nm/RIU at the angle of 16°. Meanwhile, the obtained fixed length of MZI sensing arm was 4 μm. The proposed design can be used for identifying the existence of liquid material precisely.

Electromagnetic coupling mechanism in vertical and horizontal SRR-loaded coplanar waveguide

Investigations on the electromagnetic coupling effect of rectangular split ring resonators (SRRs) coupled to coplanar waveguide (CPW) are presented. Rectangular SRRs shape alteration and its effect to transmission line performance has been studied by changing its vertical and horizontal 2-d orientation. We observe that the confined magnetic field plays an important role in determining the resonance frequency and the bandwidth broadening of the transmission line, which also contributes to the insertion loss difference. Our investigation provides experimental basis for developing better filtering device in the microwave and milimeter-wave range.

Performance of narrowband hairpin bandpass filter square resonator with folded coupled line

This paper presents narrowband hairpin bandpass filter square resonator with folded coupled line for operating frequency of 3 GHz. The filter was designed for S-Band applications that need narrow bandwidth. The numerical characteristics of proposed filter were obtained by using software simulation ADS2011.10. Optimization was done to find good performance of the filter. The filter has insertion loss −1.949 dB and VSWR less than 2. The dimension of filter is 73.51 mm × 10.4 mm and approximately 14% less than the dimension of conventional hairpin bandpass filter.

The effect of external interference on the performance of navigation radar

Radar performance can be downgraded when facing interference. One of external interference is another radar placed in the nearby location which behaves as a jammer affecting the radar maximum detection by decreasing the signal to noise ratio (SNR) level. This paper describes the effect of external radar as a source of jammer in the main-radar performance. This can be occurred when multiple radars are used in one platform. The radar model was simulated by radar parameter which was already being developed in the lab. There are three scenarios presented. First condition is the absence of interference, second one is where radar and jammer are installed in one place, and the last is when radar is influenced by jammer from another place. The presence of jammer degraded the radar performance by decreasing the radar maximum detection as in scenario two. The existence of another radar in one platform should be considered by the radar designer to optimize the radar performance.

Design of Polymer Triple Coupler Ring Resonators for add/ drop optical filters

Optical filter is very important components in WDM network. MRR is a basic structure to design the optical filter because of easy to design for improving its performance. This paper discusses an innovative structure of the MRR, which is Polymer Triple Coupler Ring Resonators (PTCRR) for optical filter applications. Values of width between bus and ring and values of radius of the ring in the structure PTCRR were analyzed and optimized for several variations for obtaining coupling coefficient values. Therefore, wide Free Spectral Range (FSR) and high crosstalk suppression bandwidth can be obtained. As results, at the optimized width of gap of 100 nm and the optimized radiation of 8 μm, FSR of 2.85 THz and crosstalk suppression bandwidth of 60 GHz were achieved. Based on the results, this structure can be used for filtering optical signals in optical fiber communication.

Optimization of optical filter using triple coupler ring resonators structure based on polyimide substrate

Optical filter is very important components in WDM network. MRR is a basic structure to design the optical filter because of easy to design for improving its performance. This paper discusses an innovative structure of the MRR, which is Triple Coupler Ring Resonators (TCRR) for optical filter applications. Values of width between bus and ring and values of radius of the ring in the structure TCRR were analyzed and optimized for several variations for obtaining coupling coefficient values. Therefore, wide Free Spectral Range (FSR) and high crosstalk suppression bandwidth can be obtained. As results, at the optimized width of gap of 100 nm and the optimized radiation of 8 μm, FSR of 2.85 THz and crosstalk suppression bandwidth of 60 GHz were achieved. Based on the results, this structure can be used for filtering optical signals in optical fiber communication.