Synthesis of TLM-Based UWB Planar Monopole Impedance Bandwidth

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.

[1]  Hans Schantz,et al.  The art and science of ultrawideband antennas , 2005 .

[2]  M.Y.W. Chia,et al.  Considerations for source pulses and antennas in UWB radio systems , 2004, IEEE Transactions on Antennas and Propagation.

[3]  Zhi Ning Chen,et al.  Characterization of ultrawideband antennas using transfer functions , 2006 .

[4]  Max J. Ammann,et al.  Control of the impedance bandwidth of wideband planar monopole antennas using a beveling technique , 2001 .

[5]  C. Balanis.  Antenna theory , 1982 .

[6]  G. Kumar,et al.  Broadband microstrip antennas , 2002, Microstrip and Printed Antenna Design.

[7]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .

[8]  J. Legarda,et al.  Design of UWB folded-plate monopole antennas based on TLM , 2006, IEEE Transactions on Antennas and Propagation.

[9]  Seong-Youp Suh,et al.  A new ultrawideband printed monopole antenna: the planar inverted cone antenna (PICA) , 2004, IEEE Transactions on Antennas and Propagation.

[10]  Zhi Ning Chen,et al.  Note on antenna design in UWB wireless communication systems , 2003, IEEE Conference on Ultra Wideband Systems and Technologies, 2003.

[11]  Max J. Ammann,et al.  Planar monopole design considerations based on TLM estimation of current density , 2003 .

[12]  Kin-Lu Wong,et al.  Ultra‐wideband square planar monopole antenna for IEEE 802.16a operation in the 2–11‐GHz band , 2004 .

[13]  Roc Berenguer,et al.  A method to optimize the bandwidth of UWB planar monopole antennas , 2006 .

[14]  Ryuji Kohno,et al.  Ultra wideband antenna , 2004, IEEE Communications Magazine.

[15]  Gerhard Tröster,et al.  Characterization of small planar antennas for UWB mobile terminals , 2005, Wirel. Commun. Mob. Comput..

[16]  Max J. Ammann,et al.  Wideband monopole antennas for multi-band wireless systems , 2003 .