Theory and analysis of differentially-driven microstrip antennas

This paper studies differentially-driven microstrip antennas. The theory of microstrip antennas based on the improved cavity model is expanded to analyze the input impedance and radiation characteristics of the differentially-driven microstrip antennas. The differentially-driven microstrip antennas...

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Bibliographic Details
Main Authors: Zhang, Yue Ping, Wang, Jun Jun
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2009
Subjects:
Online Access:https://hdl.handle.net/10356/91620
http://hdl.handle.net/10220/6003
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Institution: Nanyang Technological University
Language: English
Description
Summary:This paper studies differentially-driven microstrip antennas. The theory of microstrip antennas based on the improved cavity model is expanded to analyze the input impedance and radiation characteristics of the differentially-driven microstrip antennas. The differentially-driven microstrip antennas were fabricated. Their performances were experimentally verified. Results show that the occurrence of resonance for the differentially-driven microstrip antennas also depends on the ratio of the separation έ of the dual feeds to the free-space wavelength. When the dual feeds are located far from each other έ/λ < 0.1, the resonance occurs, and the input resistance at resonance is rather large. However, when the dual feeds are located near to each other έ/λ < 0.1, the resonance does not occur, the input resistance is quite small, and the input impedance is inductive. Compared with single-ended microstrip antennas, the differentially-driven microstrip antennas have larger resonant resistance, similar co-polar radiation patterns, and lower cross-polar radiation component.