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Abstract:
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Today microwave engineering used widely in the field of communications. The wireless
communications services increasingly powerful. The implementation of these types of
communications in Ultra high frequency band has become indispensable and essential.
Especially the explosion of broadband communications to promote the deployment of
frequency channels in the ultrasonic wavelength for maximum effect permitted to use the
bandwidth capabilities. Communications in super high frequency bands have outstanding,
demonstrated the advantages of transmission in complex environment. In particular the
transmission of high frequency directly between the two points and transmission through
the ionosphere, duplex in space. In Vietnam, the systems receiver UHF band have many
important applications and is used in: broadcast television, microwave devices, radio
astronomy, mobile phones, WLAN, Bluetooth, GPS... So, study the receiver system
communications in UHF band to understand the structure, transmission characteristics in
order to proceed to master the technology to improve and apply of the product on the fact
that the ultimate purpose of the study.
In my thesis “Design and fabrication of UHF Receiver with high sensitivity using
ADF 7021”, I have completed the following tasks:
- Study about the structure of receivers system.
- Study carefully about LNA block in receiver system.
- Study about IC ADF 7021.
- Design and fabricate successfully a Low-noise amplifier circuit operate at UHF band
(500MHz) using for ADF 7021. |