M Lancaster, F Huang, T. J. Jackson, Y Wang, K Ke, A Murad, X Shang, T Skaik

Transcription

1 M Lancaster, F Huang, T. J. Jackson, Y Wang, K Ke, A Murad, X Shang, T Skaik School of Electronic Electrical and Computer Engineering The University of Birmingham Passive Microwave Circuit Research

2 Devices and Systems Research Centre Microwave and communications related research Antennas and Applied Electromagnetics (PSH) Antennas for mobile, fixed and implant communications Radiowave propagation for body centric communications Distributed Systems and Networks (CCC) Large-scale network modelling Bio-inspired network protocols Ad-hoc networks Adaptive Network Architectures Emerging Device Technologies (MJL, FH, TJ, PAS, ET, PAC) Microwave devices and circuits Superconductors Ferrites Ferroelectrics Microwave MEMS Microwave Integrated Systems (MC) Bistatic radar Wideband radar Radar transponders Optical Devices (HGS) Optical device analysis, simulation and design Microstrip Filters Microwaves with Computational Intelligence (PG) Switches and Beamformers MEMS for Circuit Integration Amplifier linearisation Millimetric Communications Innovations

3 Research Areas The development of new materials, technologies and circuits for microwave applications Micromachined microwave devices Membrane devices, superconducting/micromachined devices, micromachined coaxial and waveguide devices, switches Superconducting microwave circuits Delay lines, antennas, filters Filters Dielectric combline resonators and filters, waveguide filters, new filter design techniques Ferroelectrics Material development (laser ablation), tunable microwave circuits

4 Transmission line Layer 1 Layer 2 Layer 3 Layer 4 Metal coated SU8 or Silicon Round coaxial cable Layer 5 Square coaxial cable waveguide Size of inner conductors from around 3 micron to 1mm. Stubs to hold up inner conductors Shielded low cross-talk, radiation Dielectric free no dielectric loss + no related parasitic mode

5 Stub Supported Rectangular coaxial line Filters SU8 pieces Gold coated half assembled Fully assembled -1-1 S 11 (db) Simulated Measured S21 (db) Frequency (GHz)

6 38 GHz circuits S 11, db Simulated S 11 ; S 21-2 Measured S11 S11M* -25 S22 S22M* -25 S21 S21M* M*: after the 2nd evaporation Frequency, GHz Cavity filter S21, db -5 Simulation S 21 (db) Measurements 36. GHz 36.7 GHz 37. GHz 37.3 GHz 38. GHz 39. GHz Angle (degree) Hybrid coupler Patch antenna 4 port Butler matrix with patch antennas

7 6-8 GHz circuits -2 Measurement S 21 (db) S 11 (db) Simulated Measured S21 (db) Frequency (GHz) Narrowband filter Frequency (GHz) Wideband filter Coaxial line to ridge waveguide transition S11 and S21 in db Measured S11 Measured S21-5 Simulated S11 Frequency (GHz) Simulated S21 Coaxial to ridge waveguide transition Horn antenna Butler matrix with two element patch Array Ridge waveguide slot antenna

8 W band waveguide Waveguide, bends and flange Waveguide Filter bends and flange

9 3 GHz components Bends and flange Straight waveguide Two right angle bends, waveguide and flange. Filter Slot antenna Bandpass filter, bends and flange

10 Butler Matrix with Antenna Array Y. Wang, M. Ke, M. J. Lancaster, A Ka-Band Butler Matrix with Antenna Array Based on Micromachined Rectangular Coaxial Structures, European Microwave Conference 29.

11 Designs and Measurements Normalized S 12 (db) Simulated 38 GHz Measured 35 GHz 36 GHz 37 GHz 38 GHz Angle (degree)

12 W-Band Waveguide Six layers; WG Length: 18mm; Layer thickness:.635mm

13 W band waveguide with flange and bends Six layers; WG Length: 18mm; Layer thickness:.635mm

14 W Band Waveguide Filter With Two Bends

15 W Band Waveguide Filter With Two Bends CST Simulation Measurement

16 Slot Waveguide Antenna for 3 GHz Brass plates (mechanical strengthening, NO alignment function) simulation Metal coated SU-8 (with alignment holes & interfaced with flange) 8-element slot waveguide antenna, fed through a right-angle ridged bend, interfaced with WR-3 waveguide flange UG-387. simulation

17 3GHz Waveguide and Filter Measured Using Metal Block Made at Rutherford Appleton laboratories

18 3GHz Waveguide and Filter Measured Using Metal Block Length 15mm.7db/mm.4 db/mm

19 Examples of research work Microwave component design based on the coupling matrix

20 M = Q e1 = Q e8 = X-band dual band waveguide filter Measurement and simulation

21 Topology of the Quad-band Filter with 12 resonators Input Output resonators direct couplings Input Output cross couplings qe1=qe12=1.7356

22 Multiple input/output circuits with couple resonator structure Output f1 Input 1 Input 2 Output f2 Output f3 Output f4

23 X-band Power Divider M = qe=

24 X-band Diplexer M = q e1 =6, q e2 =q e3 =

25 12 resonator diplexer M 12 =.853, M 23 = M 28 =.451, M 34 = M 89 =.2757, M 45 =M 9,1 =.2624, M 56 =M 1,11 =.2759, M 67 =M 11,12 =.387, M 33 = -M 88 =.4827, M 44 = -M 99 =.5395, M 55 = -M 1,1 =.5441, M 66 = -M 11 =.5447, M 77 = -M 12,12 =.5458 q e7 =q e12 = 2.288

26 Acknowledgment The work has been done by the research fellows in the EDT group over a number of years and a number of different students and research fellows. I would like to thank them all. Projects funded by UK EPSRC.

27 HTS circuits Laser ablation Cryogenic probe station Laboratory Visit Clean room 3 GHz Analyser Red Group Mao Ke 1:18 HTS filter 1:26 Probe station 1:34 Clean room 1:42 Network Analyser 1:5 Laser Ablation 1:58 Back to G33 Blue Group Asniza Murad 1:18 Network Analyser 1:26 HTS filter 1:34 Probe station 1:42 Clean room 1:5 Laser Ablation 1:58 Back to G33 Green Group Xiaobang Shang 1:18 Clean room 1:26 Network Analyser 1:34 HTS filter 1:42 Probe station 1:5 Laser Ablation 1:58 Back to G33 Yellow Group Paul Smith 1:18 Probe station 1:26 Clean room 1:34 Network Analyser 1:42 HTS filter 1:5 Laser Ablation 1:58 Back to G33