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An enhanced bandwidth design technique for electromagnetically coupled microstrip antennas

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1 Author(s)
Duffy, S.M. ; Lincoln Lab., MIT, Lexington, MA, USA

This paper describes a method of enhancing the bandwidth of two different electromagnetically coupled microstrip antennas by utilization of a tuning stub. An approximate theory and equations are developed to demonstrate the potential bandwidth improvement and required stub impedance characteristics. A novel dual-stub design is presented that achieves better characteristics than a conventional quarter wavelength open-end stub. As examples, the bandwidth (VSWR<2) of a conventional proximity-coupled microstrip antenna is increased from 4.8 to 8.4% and the bandwidth of a stacked aperture-coupled microstrip antenna is increased from 27.5 to 34.5% using this technique

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Antennas and Propagation, IEEE Transactions on  (Volume:48 ,  Issue: 2 )