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Broadband Consideration

This document discusses techniques for broadband design of microwave devices, including the use of compensated matching networks, balanced circuits, and feedback. It provides examples and details of balanced amplifiers, Lange couplers, branch line couplers, and Wilkinson power dividers. The advantages of balanced amplifiers are outlined, such as the ability to design for flat gain and noise figure, high stability, higher output power, and the ability to still function if one amplifier fails.

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Anum Ahmed
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43 views17 pages

Broadband Consideration

This document discusses techniques for broadband design of microwave devices, including the use of compensated matching networks, balanced circuits, and feedback. It provides examples and details of balanced amplifiers, Lange couplers, branch line couplers, and Wilkinson power dividers. The advantages of balanced amplifiers are outlined, such as the ability to design for flat gain and noise figure, high stability, higher output power, and the ability to still function if one amplifier fails.

Uploaded by

Anum Ahmed
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Broadband Consideration

Course Instructor:
Ahsan Azhar
RIMMS-NUST
Broadband Consideration

EE-944 Microwave Devices II 2


Techniques for Broadband Design
Use of compensated matching networks
Use of balanced circuits
Use of feedback

EE-944 Microwave Devices II 3


Example 4.4.1

EE-944 Microwave Devices II 4


Example 4.4.1

EE-944 Microwave Devices II 5


Example 4.4.1

EE-944 Microwave Devices II 6


Balanced Amplifier

EE-944 Microwave Devices II 7


Lange Coupler

EE-944 Microwave Devices II 8


Branch Line Coupler

EE-944 Microwave Devices II 9


S parameter of balanced amplifier

EE-944 Microwave Devices II 10


Example 4.4.1

EE-944 Microwave Devices II 11


Example 4.4.1

EE-944 Microwave Devices II 12


Example 4.4.1

EE-944 Microwave Devices II 13


Example 4.4.1

EE-944 Microwave Devices II 14


Wilkinson Power Divider

EE-944 Microwave Devices II 15


Balanced Amplifier

EE-944 Microwave Devices II 16


Advantages of Balanced Amplifiers
The individual amplifiers can be designed for flat gain, noise figure
with good input and output VSWR.
There is high degree of stability.
The output power is twice that obtained from the single amplifier
If one of the amplifier fails, the balanced amplifier unit will still
operate with a 6dB loss of gain
Balanced units are easy to cascade with other units, since each unit
is isolated by the coupler

EE-944 Microwave Devices II 17

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