Surface Micromachined Millimeter-Wave Log-Periodic Dipole Array Antennas

Two wideband millimeter-wave end-fire log-periodic dipole array (LPDA) antennas are designed and fabricated using a sequential surface micromachining. The antennas are excited by monolithically integrating a micro-coaxial line feed in the antenna's lower boom designed to provide band rejection at 60 GHz. Antennas 1 and 2 are designed to operate in 18-110 GHz and 18 GHz-50 GHz bands, and measured up to 40 GHz and 50 GHz, respectively. VSWR <; 2.5 is obtained for both antennas throughout the measured bandwidth. Measured directivity around 10 dBi and consistent E and H-plane 3 dB beamwidths around 56° and 72°, respectively, are obtained for Antenna 2 throughout its bandwidth. Good pattern correlation between measured and simulated results is also achieved. This paper clearly demonstrates that the wideband high-quality millimeter-wave end-fire LPDAs are now possible.

[1]  D. Filipović,et al.  Analysis and Design of Monolithic Rectangular Coaxial Lines for Minimum Coupling , 2007, IEEE Transactions on Microwave Theory and Techniques.

[2]  Z. Popovic,et al.  Modeling of realistic rectangular /spl mu/-coaxial lines , 2006, IEEE Transactions on Microwave Theory and Techniques.

[3]  R. Carrel,et al.  ANALYSIS AND DESIGN OF THE LOG-PERIODIC DIPOLE ANTENNA , 1961 .

[4]  Fu-Chieh Hsu,et al.  Microstrip bandpass filters for Ultra-Wideband (UWB) wireless communications , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[5]  Microstrip log-periodic dipole array , 1985, 1985 Antennas and Propagation Society International Symposium.

[6]  Michael J. Lancaster,et al.  SU-8 Ka-band filter and its microfabrication , 2005 .

[7]  Jin-Koo Rhee,et al.  94-GHz Log-Periodic Antenna on GaAs Substrate Using Air-Bridge Structure , 2009, IEEE Antennas and Wireless Propagation Letters.

[8]  Elliott R. Brown,et al.  Characteristics of microfabricated rectangular coax in the Ka band , 2004 .

[9]  R. Pantoja,et al.  A microwave printed planar log-periodic dipole array antenna , 1987 .

[10]  Dejan S. Filipovic,et al.  Directly fed millimetre-wave two-arm spiral antenna , 2010 .

[11]  D. Filipović,et al.  Monolithic Rectangular Coaxial Lines and Resonators With Embedded Dielectric Support , 2008, IEEE Microwave and Wireless Components Letters.

[12]  D. Isbell,et al.  Log periodic dipole arrays , 1960 .

[13]  C. Campbell,et al.  Design of a stripline log-periodic dipole antenna , 1977 .

[14]  Wei Hong,et al.  Wideband substrate integrated printed log-periodic dipole array antenna , 2010 .

[15]  Wei Hong,et al.  Ultrawideband Printed Log-Periodic Dipole Antenna With Multiple Notched Bands , 2011, IEEE Transactions on Antennas and Propagation.