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Design and Implementation of Ka-band SPDT Switch for Array Antenna Beam Steering

Amjadian, Mohammad Reza | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50001 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fakharzadeh, Mohammad
  7. Abstract:
  8. In this thesis, study the design of a compact low-cost integrated time modulated array(TMA). In TMAs, a switch is used instead of a phase shifter, which reduces the area, complexity, power consumption and the final price of the array. The TMAs uses the switch as a control element for array weighting that causes beamforming and beam steering. For the lower cost, designed IC compacted as small as possible and use inexpensive CMOS 180nm technology of TSMC fabrication. Initially, maximum layout size forced 0.7 by 1.5 mm2. The proposed switch type is SPDT that one of its output paths terminated by a matched load and another end to a pad and then by a bond wire connected to an external board that has antennas. The purposes of the switch design are: fully cover the Ka-band, the lowest loss, suitable isolation and minimum area. The designed switch has 1.85 dB loss at 30GHz, more than 17dB isolation in Ka-band and its area is 0.086mm2. This switch, compared to other switches designed in CMOS180nm has the lowest loss and area (to date) and as shown by input return loss, it covers the whole Ka-band. Another element to design an array is a power combiner/designer with minimum area. Because this array has 4 elements, it needs a 4way power divider. The designed power combiner is lumped and therefore only covers 28.8 to 34.5 GHz. Switches and power divider form a TMA IC, that covers 30 to 36GHz properly and its area is 0.7 by 1.48 mm2 that is well suited with the design consideration. The power consumption of the array is zero since all the elements are passive and do not consume any power. Process variations do not affect the performance of the array. In order to evaluate the performance and analysis of TMA, a discrete 8 elements array designed at 1.3GHz. Using the practical results of the discrete system, added errors and studied its effects on array beam pattern
  9. Keywords:
  10. KA Band ; Power Divider ; Complementary Metal Oxide Semiconductor Technology (CMOS) ; Time Modulated Array (TMA) ; Single Pole Double Throw (SPDT)Switch ; Low Loss Switch ; Lumped Power Combiner

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