Current Projects

MMICs FOR X-BAND T/R MODULES ON GAN SUBSTRATE
Funded by Tubitak 1003-Project Number: 117E570

The aim of this project is to develop monolithic microwave integrated circuits (MMIC) to be used in X-band RADAR transmit/receive modules. Specifically, a power amplifier (PA), a robust low noise amplifier (LNA) that can withstand high input power levels without the need for a limiter, T/R switch will be realized in a commercially available GaN process. Moreover, in order to build the know-how high linearity phase shifters and digital attenuators will also be developed. The ultimate goal of this project is to design PA, LNA and switch circuits using the same technology so that future integration is possible for applications where highly integrated T/R modules are required (e.g., massive-MIMO).

Researchers: Duygu Işınsu Turan, Omer Fevzi Gungor, Oğuz Kazan
Advisor: Asst. Prof. Dr. Fatih Koçer

DESIGN OF PHASE COHERENT DIGITAL STEP ATTENUATORS
Funded by Tubitak 1001-Project Number: 114E591

Digital Step attenuators are used virtually in all communication systems to regulate the signal level to achieve maximum system performance. The figure of merit for these attenuators are linearity, accuracy, and power handling capability. Attenuators currently offered in the industry performs well to meet stringent requirements of the modern communications systems. However, all step attenuators currently offered introduces a phase-shift with respect to the attenuation setting and frequency. This phase-shift creates problems in the next generation communications systems (4G and above) where multiple antennas and phased array systems are employed. In this research we will investigate ways to compensate the phase shift of digital step attenuators while keeping all other specifications (linearity, accuracy, etc.) on par with the state of the art.

Researcher: Arash Ebrahimi Jarihani
Advisor: Asst. Prof. Dr. Fatih Koçer

DESIGN OF RF ENERGY HARVESTING CIRCUIT FOR REMOTE SENSORS

In this project, we are conducting a comprehensive study on RF energy harvester circuits which generate DC power from electromagnetic waves. It is objected to tackle the shortcomings of the typical structures, including low power efficiency, low voltage efficiency and minimum required power. Beside the above goals, power management block is of concern. Extremely low power and low voltage analog signal processing circuits are supposed to be used to make the structure reconfigurable. In this way, it is possible to increase the power conversion efficiency over a wide range of input power levels.

Researcher: Kaveh Gharehbaghi
Advisor: Prof. Dr. Haluk Kulah
Co-Advisor: Asst. Prof. Dr. Fatih Koçer

VERY LOW NOISE LNAs FOR SPACE COMMUNICATION APPLICATIONS

In this project we are working on the next generation receive modules to be used on Satellites. The MMICs developed with this research will be used in next generation satellites.

Advisor: Asst. Prof. Dr. Fatih Koçer

MMICs FOR 4.5G AND 5G BASE STATIONS
Funded by Tubitak-1511

In this project we are working on the development of high performance MMICs for next generation (4G and beyond) base stations.

Advisor: Asst. Prof. Dr. Fatih Koçer

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