Combline Cavity Filter Design in HFSS

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1 Presented by Jim Reed of Optimal Designs 3 Pole Cavity Combline Filter to be used in Demonstration for Filter Tuning Simulated / Measured Data for Real World Example, Compliments of Sierra Microwave Technologies 1

2 Outline of Presentation Optimal Designs Inc. Company Overview 3 Pole Cavity Filter Design Approach Initial Filter Design Using Filter Synthesis Software Ansoft HFSS Parametric Analysis of Resonator Spacing and Tuning Screw Gaps Ansoft Designer and Tuning Bar to Dynamically Adjust the Performance of the Filter Comparison of Ansoft HFSS Simulation to Measured Results of 6 Pole Partially Loaded Cavity Combline Filter Summary 2

3 Optimal Designs Inc Company Overview Optimal Designs is solely owned and operated by Jim Reed, who has extensive experience in 3D EM simulation, both in time domain and frequency domain. Services provided by Optimal Design generally falls into two categories, often relating to the size of the engineering force of the customer. For customers with a large engineering force, services can be provided in the form of consultation at the beginning of a design cycle in separating the design into components, choosing appropriate design tool for these components, and modeling the components in a proficient and accurate manner. In addition, services can be provided at the end of a design cycle during critical review as an expert on modeling in EM simulation tools and accuracy verification. For customers with a smaller engineering force, services can be provided in the form of additional engineering support, analyzing and optimizing designs using advanced 3D simulation. An abridged list of recent and current clientele includes Malibu Research - Camarillo, Teledyne Medical Devices - LA, PCTel MaxRad - LA, Microfabrica - Burbank, General Dynamics - Phoenix, Raytheon Missile Systems- Tucson, Sierra Microwave Technologies - Georgetown, TX. 3

4 3 Pole Cavity Combline Filter Design Overview 3 Pole Cavity Filter Design Approach Initial Filter Design Using Filter Synthesis Software Ansoft HFSS Parametric Analysis of Resonator Spacing and Tuning Screw Gaps Ansoft Designer and Tuning Bar to Dynamically Adjust the Performance of the Filter 4

5 3 Pole Cavity Combline Filter Initial Design I Several programs are available for generating the initial design of a filter. For this cavity combline filter, the filter program by Wenzel/Erlinger Associates was utilized at the Sierra Microwave Technologies facility. A center frequency was defined at 10 GHz with a 10% bandwidth and VSWR 1.1. Other input parameters are listed below. INPUT PARAMETERS Read file = JRCL10 Loading capacity: Outfile = JRCL10 Lumped X F Lower = Resonator Screw dia. = F Upper = Cover Reson. Gap = VSWR = GPS = Resonators = 3 Resonator dia. = Resonator len. = Connector K= Tap line dia. = Reson. Qu = * Surface = Silver Tap line len. = F0 = UNITS: Frequency = ghz Length = inch 5

6 3 Pole Cavity Combline Filter Initial Design II The output parameters by Wenzel/Erlinger Associates filter program, listing the resonator spacing and the tuning screw gaps above the resonators. RESONATOR DETAILS ********************************** * { } * * * GAP * ************ * ********************************** <---D4---> < GPS > D4 GPS RESONATOR SPACINGS AND TUNING SCREW GAPS Resonator physical length = inches. Input tap line diameter = inches. Input tap location above the reference plane= inches. RESONATOR AND COUPLING ADJUST LOCATIONS ADJUST RESONATOR RESONATOR SCREW LOCATIONS LOCATIONS GAP SPACING GAP < > ************* * - * * + * * - * * + * * - * * + * * - * *************

3 Pole Cavity Combline Filter EM Simulation Filter Tuning with EM Simulation 1) Taking the initial values from the Wenzel/Erlinger Associates filter program, the combline cavity filter was modeled in

7 3 Pole Cavity Combline Filter EM Simulation Filter Tuning with EM Simulation 1) Taking the initial values from the Wenzel/Erlinger Associates filter program, the combline cavity filter was modeled in Ansoft HFSS 9.2 fully parameterized. 2) A large parametric analysis was conducted altering the spacing between the resonators and the tuning screw gaps above the resonators. 3) Ansoft Designer was used to dynamically view the parametric data viewing its tuning bar interface. This simulated a real world environment at a test bench by adjusting tuning screws to a desired performance. 7

8 3 Pole Cavity Combline Filter Initial Design Using the original filter parameters in the 3D EM simulation does not yield the desired filter response. Adjusting tuning screw 2 moves the resonance toward 10GHz. 8

9 3 Pole Cavity Combline Filter Trends I Looking for other trends, the bandwidth is greatly affected by the spacing between end and center resonators. The smaller the gap, the broader the band. 9

10 3 Pole Cavity Combline Filter Trends II Once the bandwidth is fixed, adjusting the tuning screw above the first resonator refines the match of the filter. The below case is a half mil difference. 10

11 Ansoft HFSS Simulation to Measured Results The before exercise was to demonstrate the filter tuning of a simple 3 pole cavity combline filter. For this exercise, a large parametric analysis was conducted in Ansoft HFSS. The data was reviewed and tuned with the Tuning Bar interface of Ansoft Designer. The following model is a real world example with much higher complexity, compliments of Sierra Microwave Technologies. This combline is partially dielectrically loaded to avoid corona effect in a high power environment. Model and Measured Results Compliments of Sierra Microwave Technologies 11

12 Partially Loaded Cavity Combline Filter Ansoft HFSS simulation to measured results for S11. Simulation results match well to measured results. Model and Measured Results Compliments of Sierra Microwave Technologies 12

13 Partially Loaded Cavity Combline Filter Ansoft HFSS simulation to measured results for S21. Simulation results match well to measured results. Model and Measured Results Compliments of Sierra Microwave Technologies 13

14 Summary and Comments Summary A design approach for cavity combline filters was presented where the initial design was generated with a filter synthesis tool, followed by parametric analysis in Ansoft HFSS. Ansoft Designer was used to dynamically review the data and tune the filter with its Tuning Bar interface. After demonstrating this approach, a proprietary model of Sierra Microwave Technologies was presented with a comparison of Ansoft HFSS simulation to measured results. Comments With the increase complexity of filter design, such as partially filled dielectric volumes and unique launch configurations, the more 3D EM simulation is needed to design a filter that is tunable on the bench. 14

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