Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Boris Tomasic"'
Publikováno v:
IEEE Transactions on Antennas and Propagation. 69:4569-4579
The radiation pattern of an antenna within an array environment is modified by mutual coupling to neighboring elements, which can create unknown phase and amplitude variation on the order of 10° and 5 dB. This uncertainty in the element patterns res
Publikováno v:
Progress In Electromagnetics Research M. 92:213-221
Publikováno v:
2019 IEEE International Symposium on Phased Array System & Technology (PAST).
An active electronically scanning array (AESA) architecture operating in the range of 20–60 GHz is reported. The transmit/receive (T/R) modules are distributed along parallel printed-circuit-board (PCB) cards, and each PCB card feeds a single colum
Autor:
Carl Pfeiffer, Boris Tomasic
Publikováno v:
Progress In Electromagnetics Research C. 79:49-64
Publikováno v:
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting.
Recent developments in mm-Wave Active Electronically Scanned Arrays (AESA) are the primarily focus on 5G applications requiring low transmit power. For some applications where high transmit power is required, the thermal management becomes a serious
Publikováno v:
2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting.
A myriad of ultra-wide-band (UWB) 180° hybrids have been reported that operate at frequencies below 20 GHz. However, printed circuit board (PCB) parasitics become significantly more problematic as the frequency is extended to mm-wave frequencies and
Autor:
Carl Pfeiffer, Boris Tomasic
Publikováno v:
2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting.
Linear-to-circular polarizers operating at mm-wave frequencies with multiple octaves of bandwidth are reported. First, a polarizer constructed from cascaded anisotropic dielectrics is discussed. This polarizer scales the design of achromatic waveplat
Publikováno v:
2016 IEEE International Symposium on Antennas and Propagation (APSURSI).
A common way to determine the electromagnetic properties of dielectric materials is to insert a sample of the material into a waveguide and measure the resulting reflection and transmission, i.e. the S-parameters. From the S-parameters the complex pe
Autor:
Boris Tomasic, Michelle Champion
Publikováno v:
2016 IEEE International Symposium on Antennas and Propagation (APSURSI).
As known, element patterns of large planar arrays can be calculated from an infinite array approximation using a Floquet unit cell approach. For large conformal arrays, however, unit cell methods can't be used, and element patterns must be calculated
Autor:
Michelle Champion, Boris Tomasic
Publikováno v:
2014 IEEE Antennas and Propagation Society International Symposium (APSURSI).
A sparse trifilar antenna can support two independent beams while, to reduce the interference between the beams, each array element supports only one beam. To minimize the grating lobe effects each beam is formed by three spiral arms resulting in a s