3 research outputs found
Integrated Open Loop Resonator Filter Designed with Notch Patch Antenna for Microwave Applications
This paper presented the design of integrated open loop resonator bandpass filter with notch type antenna for the use in microwave applications. Chebyshev type filter is selected as the filter characteristics and cascaded design with the antenna to produce a single module, Integrated Filter Antenna (IFA). Special feature of the antenna is the implementation of notch on the patch antenna to improve the efficiency. IFA is then simulated in electromagnetic simulation tool, Agilent Advance Design System (ADS) version 2016 and measured using R&S Vector Network Analyzer. It shows that the proposed IFA produced good measured return loss >-30dB with both vertical and horizontal gain of 9.11dBi and 8.01dBi respectively
Integrated Open Loop Resonator Filter Designed with Notch Patch Antenna for Microwave Applications
This paper presented the design of integrated open loop resonator bandpass filter with notch type antenna for the use in microwave applications. Chebyshev type filter is selected as the filter characteristics and cascaded design with the antenna to produce a single module, Integrated Filter Antenna (IFA). Special feature of the antenna is the implementation of notch on the patch antenna to improve the efficiency. IFA is then simulated in electromagnetic simulation tool, Agilent Advance Design System (ADS) version 2016 and measured using R&S Vector Network Analyzer. It shows that the proposed IFA produced good measured return loss >-30dB with both vertical and horizontal gain of 9.11dBi and 8.01dBi respectivel
The Effect of Headset and Earphone on Reducing Electromagnetic Radiation from Mobile Phone toward Human Head
Studies show that exposure to the electromagnetic wave
for a certain period of time will leads to health problem such as
headaches, or even worse, brain cancer. Scientist have known
that this radiation might cause human biological damage through
heating effects since human body is made up of approximately
65-70% water, electrolytes and ions. Radio frequency radiation
emitted from mobile phone will interact with human body and
interfere with human body’s natural healing resulted
displacement of electrolytes and ions within the body. This paper
discussed on the analysis conducted to study the effect of
electromagnetic radiation (thermal radiation) of mobile phones
with different frequencies via experimental works. The
experiment was conducted in a laboratory using a volunteer
(human). The period of operation is 45 minutes as the
talking time on the phone. Thermal imaging technique is used to
monitor and capture the temperature distribution during the
experimental analysis for every 5 minutes interval. Images will be
collected and analyzed using graphical plot. Devices such as
Bluetooth headset and earphone are also used to study either this
equipment are effective to reduce the effect of thermal radiation
toward human head or not. The result shows that mobile phone
serving GSM 900MHz has the highest temperature increment
compare to mobile phone serving GSM 1800MHz. It is also
shown that GSM 900MHz has greater thermal radiation effect or
heating effect. By using Bluetooth headset and earphone device
when talking via mobile phone, the result shows lower radiation
since direct radiations from the mobile phone antenna was
reduce