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Synthesis of TLM-Based UWB Planar Monopole Impedance Bandwidth

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4 Author(s)
Valderas, D. ; Navarra Univ., San Sebastian ; Sedano, B. ; Garcia-Alonso, A. ; Sancho, J.I.

A simple formula based on transmission line modeling (TLM) is proposed to determine the impedance bandwidth upper frequency limit for a staircase-profile planar monopole antenna. After a brief description of TLM analogy for planar monopoles, the formula is derived from a theoretical exposition. Accordingly, four prototypes are designed, implemented and measured in such a way that they are required to cover direct sequence ultrawideband (DS-UWB) first band (up to 4.85 GHz), UWB (up to 10.6 GHz) and possible future broadband systems (e.g., up to 15 and 21.4 GHz). The formula predicts this limit with a maximum error of 7.4% in the prototypes studied. The height of the antennas is chosen so that they help to filter WLAN 5 GHz band on the H-plane. This condition determines the lower impedance bandwidth limit (1.3 GHz for all of them). The resulting improvement on antenna system transfer functions (ASTF) is also discussed.

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Antennas and Propagation, IEEE Transactions on  (Volume:55 ,  Issue: 10 )