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This paper presents a low-profile wideband dual-polarized X-band microstrip sub-array for SAR payload on small satellite fed by a hybrid series/parallel network. The sub-array of 1×16 microstrip radiators, fully covers the targeted 9.65GHz band with 14dB bandwidths of 9.1–10.3GHz for V-polarization (VP) and 9.13–9.93GHz for H-polarization (HP). The isolation is better than 35dB. The average realized...
A compact passive two-bit metamaterial based phase-modulated chipless RFID tag at 2.4GHz is presented. The chipless RFID tag consists of a monopole antenna and CRLH delay lines operating in the left-handed (LH) region with distributed digital phase modulating sections. A Quadrature Phase Shift Key (QPSK) is implemented using the four phase modulating sections having unique input reflection coefficients...
In this paper, we present a wideband mobile antenna with two modes that can produce dual-polarized omni-directional radiation patterns using a segmented loop element. The two different modes are designed to operate at neighbouring frequencies to realize the wideband property. The segmented loop itself induces one mode and radiates H-polarized radiation pattern. In the meantime, the loop element excites...
A practical low-profile broadband dual-polarized patch sub-array is designed for highly integrated X-band SAR payload on small satellite with enhanced isolation, suppressed cross-polarization and reduced side-lobe level. The proposed sub-array is lightweight with low profile (due to its tile structure realized by multi-layer PCB process). The proposed sub-array has 14-dB operating bandwidths of 0...
In this paper, a compact monopole fractal antenna for the TV white space frequency band is designed and fabricated for energy harvesting applications. The monopole is designed by the combination of modified Giuseppe Peano fractal geometry and impedance steps and fabricated on a 1.6mm thick FR-4 substrate. The feeding circuit is designed to be a microstrip line with a semi-circular ground plane. The...
In this paper, an overview of the antennas for RF energy harvesting is presented. The specifications for these antennas such as low profile, lightweight, compact size, polarization multiband and planar structure characteristics are also discussed. In addition, the recent related work of our group is also included.
A 94GHz passive millimeter wave (PMMW) imaging system is designed, prototyped and tested for target detection in haze and fog. To compact the system size and increase the scan area and speed, continue azimuth with step elevation (θ-φ) scanning is used here. Center frequency of the detected signal is 94GHz and the bandwidth is +/-2GHz. To increase the sensitivity and eliminate noise, an instrumentation...
This paper presents an efficient method of millimeter wave (MMW) image formation using synthetic aperture radar (SAR) modeling. A commercial vector network analyser (VNA) transmits and receives the signal centered at 35GHz. The MMW signal illuminates and reflects off the surface of the target. The collected signals from VNA are processed under the MATLAB environment. Experiment results show that MMW...
This paper presents a simple and efficient method of millimeter-wave image formation using back-projection algorithm. A commercial Vector Network Analyzer transmits and receives a wideband signal centered at 35GHz. The millimeter-wave signal illuminates and reflects off the surface of the target. A widely employed algorithm in computed tomography is used to perform imaging processing, specifically,...
The role of interferon‐γ release assays in the diagnosis of active tuberculosis disease is uncertain, and recent guidelines do not support their routine use. We reviewed the clinical records of 415 patients who had a QuantiFERON‐TB Gold In‐Tube assay between 29 June 2005 and 28 October 2010 to determine its performance in the diagnosis of active tuberculosis disease in a low prevalence setting, specifically...
In this paper, a circularly polarized reconfigurable planar inverted cone antenna (PICA) is designed, fabricated and tested. Generally, PICA antenna shows wider-bandwidth and linear polarization characteristics. However, in order to generate circular polarization, asymmetrical types of two unbalanced circular slots are etched on PICA at angle of 45°. Parametric study is done to determine the optimal...
This paper reviews important research and development (R&D) activities in microwave, millimetre wave (mmW) including microwave photonics in the academic and research institutions in Singapore. Singapore is transforming its economy to one that is innovation driven and knowledge based. The relevant information on the overall public R&D investment is provided. The upcoming research areas related...
A 60GHz 4×4 circular polarized (CP) patch array antenna with a 90nm CMOS OOK modulator are integrated in low temperature co-fired ceramic (LTCC) substrate to form a SiP transmitter. The CP array shows a 3dB axial ratio (AR) bandwidth of over 8GHz. It has a 3dB beamwidth of 20º and a peak gain of 16.8dBi. Device modeling at 60GHz is done to accurately simulate the lumped components. The CMOS modulator...
This paper describes a 2.4GHz square slot antenna and power management circuit for wireless energy harvesting applications. The antenna is designed at 2.4GHz. The antenna element comprises of 4 square slots cut on top and ground plane compared to the conventional designs, which has resulted in improved gain and return loss. A half-bridge rectifier comprising of one low threshold schottky diode has...
This paper describes a SIW based slot array antenna and power management circuit for wireless energy harvesting applications. The circuit integrates a high gain linear polarized 1x2 slot array antenna and a power management circuit to form an efficient energy harvesting system. The antenna is designed at 2.4 GHz based on substrate integrated waveguide (SIW) technology. The antenna element comprises...
This paper overviews the research and development (R&D) of microwave & millimeter-wave technology in public research institutions in Singapore. With increased investigation, Singapore government has supported several R&D programs related to microwave and millimeter-wave technology. The R&D activities of local universities and research institutions, in particular, from Agency of Science,...
A substrate integrated waveguide (SIW) bandpass filter based on negative order resonance is designed, fabricated and tested. Composite right/left hand (CRLH) functionality is generated by incorporating series interdigital slots on the surface of the SIW. The slot acts as series capacitor and shunt inductor, and the resonance generated is below the waveguide cut-off frequency. The bandpass filter presented...
This paper presents key research and development (R&D) programs in microwave, millimetre wave (mmW), submillimeter wave (submmW), and Terahertz technologies in the public institutions in Singapore. Firstly, the background information on the overall public R&D investment is provided. The key R&D areas and organizations related to microwave engineering in Singapore are introduced. The R&D...
Narrow band Fabry-Perot (F-P) based electromagnetic bandgap (EBG) bandpass filter is designed, fabricated and measured. This narrow bandpass characteristic is due to the defect cavity formed in the bandgap structures by the insertion of a transmission line resonator in between the two bragg reflectors. The parametric analyses of the FP-EBG filter are investigated by considering; i) effect of EBG cells...
The stripline fed 60GHz CP 2x4 patch array and LP grid array were designed in LTCC technology. The arrays with GCPW-stripline transitions were fabricated and measured in terms of the impedance matching performance and polarization characteristics. The wireless access advantage of the CP patch array over the LP grid array antenna is demonstrated.
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