Upload
marco-lisi
View
403
Download
7
Tags:
Embed Size (px)
DESCRIPTION
My presentation of the paper "A Review of Temperature Compensation Techniques for Microwave Resonators and Filters" at the Micro and Millimeter Wave Technology and Techniques Workshop 2014, 25-27 November 2014, ESA/ESTEC, Noordwijk, the Netherlands.
Citation preview
ESA UNCLASSIFIED - For Official Use
A Review of Temperature Compensation Techniques for Microwave Resonators and Filters Dr. ing. Marco Lisi Micro and Millimeter Wave Technology and Techniques Workshop ESA–ESTEC, 27/11/2014
Marco Lisi | 27/11/2014 | Slide 2
ESA UNCLASSIFIED - For Official Use
Summary
• For on-board satellite applications, the performance over temperature of microwave resonators and filters is an important driver in the design;
• In the satellite environment, thermal excursions can be relatively large and thermal control techniques are difficult to implement, especially in components handling of high power levels (e.g. output multiplexers);
• Temperature compensation techniques for microwave resonators and filters are often based on some degree of ingenuity, although associated to a good knowledge of the electromagnetic modeling of resonators and of the physical properties of materials.
Marco Lisi | 27/11/2014 | Slide 3
ESA UNCLASSIFIED - For Official Use
Temperature Compensation Methods 1. Using in the design of the microwave resonator or
filter materials with high thermal stability, both in terms of physical dimensions and in terms of electrical characteristics (e.g. dielectric constant);
2. Implementing some sort of temperature control of the component environment, thus removing the cause of the thermal drift;
3. Designing the component with some built-in compensation technique, based on the use of materials with different physical and/or performance characteristics over temperature.
Marco Lisi | 27/11/2014 | Slide 4
ESA UNCLASSIFIED - For Official Use
CTEs of Filter Materials
Marco Lisi | 27/11/2014 | Slide 5
ESA UNCLASSIFIED - For Official Use
Invar Drawbacks
• High density (8050 kg/m3 as compared to the Aluminium 2700 kg/m3);
• Poor machinability; • Low thermal conductivity (more than one order of
magnitude lower than Aluminium); • Poor electrical conductivity (in order to achieve a
high Q value, it is essential to silver plate an invar cavity);
• Is an iron-nickel alloy (i.e., some sort of stainless steel), so it tends to generate PIMs.
Marco Lisi | 27/11/2014 | Slide 6
ESA UNCLASSIFIED - For Official Use
Constrained-Expansion Cavity Resonator
Marco Lisi | 27/11/2014 | Slide 7
ESA UNCLASSIFIED - For Official Use
Dielectric Materials Electrical Characteristics
Material Composition Ɛr Tgδ (10-4) TC (Ɛr) (ppm/°C) Non-Organic Dielectric Substrates
Quartz SiO2 3.75 1.5 +0.5 Alumina (96%) Al2O3 10.2 2 +7.5 Barium Titanate BaTiO3 85 3 +8
Organic Dielectric Substrates Standard FR-4 Fiberglass 4.5 260 +200
Rogers Duroid 5870 PTFE Random Glass Fiber 2.33 12 -115 Rogers 4003 Woven Glass Reinforced
Hydrocarbon/Ceramics 3.38 27 +40
Rogers Duroid 6002 PTFE with Ceramic Fillers 2.94 12 +12 Arlon CLTE-XT Ceramic Powder-Filled Woven
Micro Fiberglass Reinforced PTFE
2.94 12 -9
Marco Lisi | 27/11/2014 | Slide 8
ESA UNCLASSIFIED - For Official Use
Dielectric Materials in DROs and Cavity Filters
Marco Lisi | 27/11/2014 | Slide 9
ESA UNCLASSIFIED - For Official Use
PCB (Microstrip) Microwave Filters
Marco Lisi | 27/11/2014 | Slide 10
ESA UNCLASSIFIED - For Official Use
Temperature Controlled (Heatpipe) Filter
Marco Lisi | 27/11/2014 | Slide 11
ESA UNCLASSIFIED - For Official Use
Temperature Compensated Microstrip Filter
Marco Lisi | 27/11/2014 | Slide 12
ESA UNCLASSIFIED - For Official Use
Temperature Compensation of Coaxial Resonators
𝜔𝜔0C = 1
𝑍𝑍0 𝑡𝑡𝑡𝑡 𝜗𝜗
1 + 𝛼𝛼∗ 𝑡𝑡𝑡𝑡𝜗𝜗 = 𝑡𝑡𝑡𝑡[𝜗𝜗 1 + 𝛼𝛼2𝑇𝑇 ]
𝛼𝛼∗= 𝛼𝛼1 +𝐿𝐿2𝐿𝐿1
(𝛼𝛼1 − 𝛼𝛼2)
Marco Lisi | 27/11/2014 | Slide 13
ESA UNCLASSIFIED - For Official Use
Temperature Compensated Combline Filter
Marco Lisi | 27/11/2014 | Slide 14
ESA UNCLASSIFIED - For Official Use
Re-entrant Cap Temperature Compensated Filter
Marco Lisi | 27/11/2014 | Slide 15
ESA UNCLASSIFIED - For Official Use
Temperature Compensated TE011 Cavity Resonator
Marco Lisi | 27/11/2014 | Slide 16
ESA UNCLASSIFIED - For Official Use
𝑻𝑻𝑻𝑻𝟎𝟎𝟎𝟎𝟎𝟎 Resonant Mode
Marco Lisi | 27/11/2014 | Slide 17
ESA UNCLASSIFIED - For Official Use
Bi-Metal Technology: John “Longitude” Harrison
Marco Lisi | 27/11/2014 | Slide 18
ESA UNCLASSIFIED - For Official Use
Ku-Band, Pseudo-Elliptic, Four-Poles Filter Configuration
Marco Lisi | 27/11/2014 | Slide 19
ESA UNCLASSIFIED - For Official Use
Aluminium Filter Over Temperature (∆T≅60°C)
Marco Lisi | 27/11/2014 | Slide 20
ESA UNCLASSIFIED - For Official Use
Compensated Filter Over Temperature (∆T≅60°C)
Marco Lisi | 27/11/2014 | Slide 21
ESA UNCLASSIFIED - For Official Use
Conclusion
Microwaves ≠
Microwaves are
or
Marco Lisi | 27/11/2014 | Slide 22
ESA UNCLASSIFIED - For Official Use