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A non-destructive and easy to use method is presented to characterize p-type and n-type silicon semiconductor wafers using a rectangular dielectric waveguide measurement (RDWG) system. The measurement system consists of a vector network analyzer (VNA), a pair of coaxial cable, coaxial to waveguide adapter and dielectric-filled standard gain horn antenna. In(More)
Smart antenna refers to any type of antenna arrays combined with signal processor components which can adjust its own beam pattern in order to emphasize on the signal of interest and minimizing the interference signal. The accurate estimation of direction of interest which is also known as direction of arrival (DOA) of the incident signals is very(More)
The ionospheric Total Electron Content (TEC) measurements were investigated at Universiti Teknologi Malaysia, UTMJ on 20 February - 20 March 2007. The observation was made 14 days before earthquake and 14 days after earthquake. TEC is extracted using GPS dual frequency data which in RINEX format that supplied by JUPEM (Jabatan Ukur dan Pemetaaan Malaysia).(More)
This project presents a microwave non-destructive testing (MNDT) method to determine the ripeness of Siamese mangoes at a frequency range of 18 to 26.5 GHz (K-Band) using free space microwave measurement (FSMM) system. The basic components of the FSMM system are spot focusing horn lens antennas, a vector network analyzer (VNA) and a computer. In this(More)
This paper presents Chebyshev three and four poles microstrip hairpin filter for radar applications. The filters are operated at K-band frequency segment of 20-20.3 GHz. The filters were designed using Genesys software and implemented on Roger 5870 substrate. The results from simulation and measurement show that both filters were operating at the desired(More)
This paper described the design, simulation and fabrication of a parallel-coupled band pass filter. The design was for K-band applications with bandwidth of 300 MHz. The filter was operated between 21 to 21.3 GHz. The circuit was designed and simulated using Genesys and the measurement was carried out after fabrication on RT Duroid 5870 with 0.508 mm(More)
This paper describes the 3D simulation and measurements of free space characterization for the complex permittivity of p-type and n-type doped silicon wafers at K-band. The component of this free space measurement system (FSMM) consists of Millitech series GOA Gaussian optics lens antennas, vector network analyzer (VNA) and a high performance workstation.(More)
Space weather is a fairly new field in science today and has very interesting effects on the humans and technology in general. Geomagnetic storms are part of space weather and the solar-terrestrial connection. These storms have greatly affected the earth' s atmosphere and ionosphere. This project focus on detection of TIDs during geomagnetic storms. TID is(More)
Design of amplifier matching networks typically involve graphical or numerical methods which are tedious and time-consuming. We report here a technique to synthesize broadband matching networks using a commercially available mathematical package which speeds up the synthesis process. The package developed in this study offers an additional capability of(More)
An algorithm using only transmission measurements to calculate the complex permittivity of p-type and n-type silicon semiconductor wafers using a spot-focused free-space measurement system was developed. The dielectric constant obtained was close to published values for silicon wafers. The errors associated with the measurement of the complex permittivity(More)
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