Negative impedance elements and their applications in antenna miniaturization
Electrically small antennas present high-Q impedance characterized by large reactance and small radiation resistance. For such antennas, the effectiveness of passive matching is severely limited by gain-bandwidth theory, which predicts narrow bandwidths and/or poor gain. It is possible in theory to...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2011
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| Online Access: | http://hdl.handle.net/10356/42856 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Electrically small antennas present high-Q impedance characterized by large reactance and small radiation resistance. For such antennas, the effectiveness of passive matching is severely limited by gain-bandwidth theory, which predicts narrow bandwidths and/or poor gain.
It is possible in theory to transform the antenna into an active component that is no longer limited by the gain-bandwidth-size. The technique of non-foster impedance matching employs active networks of negative impedance converters (NICs) such as negative inductors and capacitors to bypass the restrictions of gain-bandwidth theory.
This report mainly focuses on how to realize the negative impedance converters and their applications in antenna miniaturization design. |
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