Time filter

Source Type

Perak, Malaysia

Zahari M.K.,UniversitiTeknikal Malaysia Melaka eM | Ahmad B.H.,UniversitiTeknikal Malaysia Melaka eM | Shairi N.A.,UniversitiTeknikal Malaysia Melaka eM | Wong P.W.,UniversitiTeknologiPetronas
2011 IEEE International RF and Microwave Conference, RFM 2011 - Proceedings | Year: 2011

This paper demonstrates a reconfigurable matched bandstop filter. The filter is based on a lossy allpass network. The lossy allpass network demonstrates the concept and design of perfectly matched bandstop response with a perfect matched at all frequencies. The filter is based on the half-wavelength over (λ/2) resonator with gap coupling, parallel with an allpass nominally-90°-phase-shift element, which can be optimized to achieve high Q-factor. The reconfigurable matched bandstop filter can be realized by using PIN diodes as a switching element. This filter provides two state of operation under two conditions. The first condition is that the filter will produce allpass response when the PIN diodes are turned 'ON'. The second condition is that the filter will produce bandstop response when the PIN diodes are turned 'OFF'. Theoretical analysis together with experimental results is presented in this paper. © 2011 IEEE. Source

Zahari M.K.,University Technical Malaysia Melaka | Ahmad B.H.,University Technical Malaysia Melaka | Shairi N.A.,University Technical Malaysia Melaka | Wong P.W.,UniversitiTeknologiPetronas
IEEE Symposium on Wireless Technology and Applications, ISWTA | Year: 2012

This paper demonstrates a reconfigurable dual-mode ring resonator matched bandstop filter. The dual-mode ring resonator structure is composed by two degenerate modes or splitting resonant frequencies using a perturbing stub. The reconfigurable dual-mode ring resonator matched bandstop filter is realized by using PIN diodes as switching elements. This reconfigurable filter provides two states of operation; allpass and bandstop response. Frequency of 1 GHz is chosen to demonstrate this operation. The theoretical analysis together with simulation and measurement results are presented in this paper. As a result, this filter can be reconfigured between allpass and bandstop using PIN diodes at 1 GHz. © 2012 IEEE. Source

Mohammed B.S.,UniversitiTeknologiPetronas | Nuruddin M.F.,UniversitiTeknologiPetronas | Dayalan Y.,University of Selangor
BEIAC 2013 - 2013 IEEE Business Engineering and Industrial Applications Colloquium | Year: 2013

High permeable concrete (HPC), due to its high void ratio and permeability, is considered as an option to substitute the conventional impervious pavements for managing stormwater runoff in a cost-effective and friendly environmental way. HPC is made of single graded sized of coarse aggregate bound together with ordinary cement without or with little fine aggregate. Due to its low compressive strength, HPC is only used as pavement material. For the purpose of developing a new type of HPC with enhanced structural strength without compromising its permeability, five pozzolanic materials (fly ash, silica fume, paper-mill ash, palm oil ash and rice husk ash) were used as partial replacement to ordinary cement. Their effects on the compressive strength, void ratio and permeability of HPC were investigated. It was found that 5% of cement replacement with pozzolan will lead to enhance the compressive strength and permeability of HPC. © 2013 IEEE. Source

Umar U.,UniversitiTeknologiPetronas | Tukur H.,Tianjin University of Technology and Education | Khamidi M.F.,UniversitiTeknologiPetronas | Alkali A.U.,UniversitiTeknologiPetronas
Advanced Materials Research | Year: 2013

As education and concern pertaining to environmental and sustainability issues like implications of resources destruction, decrease in bio-diversity as well as climate change multiply, so has the need for housing developments that lead to less damaging effects on the environment, whilst enabling living standard to be sustained. Builders, developers and material providers have addressed this demand by creating approaches and technologies that minimize energy, water and main material consumption, decrease greenhouse gas emissions and sustain or enhance surrounding ecological systems and services. Several administration and non-governmental institutions in addition have aimed to change the sustainability of the building industry by developing green rating systems that can be used to evaluate the environmental performance of new and existing building. This paper discusses material resources criteria and the impact as a sustainable rating tool. © (2013) Trans Tech Publications, Switzerland. Source

Anjum N.,UniversitiTeknologiPetronas | Badruddin N.,UniversitiTeknologiPetronas | Drieberg M.,UniversitiTeknologiPetronas
2014 5th International Conference on Intelligent and Advanced Systems: Technological Convergence for Sustainable Future, ICIAS 2014 - Proceedings | Year: 2014

In this progressive world traffic congestion is a critical issue. It results in huge amount of time and resources loss. Vehicles in congestion is a valuable parameter for drivers to anticipate the state of congestion. The proposed approach is based on relating the relationship of different transmission ranges with vehicle density. This research work uses a GrooveNet simulator, which is based on real street maps and plays a major role in discovering and disseminating congestion information. Our simulation results are based on average values of number of vehicles caught in congestion with respect to transmission range and vehicle density. © 2014 IEEE. Source

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