Accurate 3D EM simulations and precision machining for low cost microwave and millimeter wave filters/diplexers Adam Abramowicz , Maciej Znojkiewicz QWED, Poland MWTG Telecom, Canada. Outline 1. Introduction 2. Segmentation and E-M simulations 3. Examples
Accurate 3D EM simulations and precision machining for low cost microwave
and millimeter wave filters/diplexers
Adam Abramowicz, Maciej Znojkiewicz
MWTG Telecom, Canada
Outline cost microwave
2. Segmentation and E-M simulations
- 13 GHz and 15 GHz diplexers
- filter and 26 GHz filter
- filters for DBS Block Up Converters
- combline X-band filter
•Application - low cost digital radio links. cost microwave
•Highly competitive market.
•Low cost products
rectangular waveguide technology
•quick design and manufacturing cycle
accurate 3D electromagnetic simulation
accurate CNC machining
•CNC vertical milling machines cost microwave ±40 microns accuracy
internal rounded corners in E- and/or H- plane
• ±40 micron accuracy translates to ±140 MHz frequency accuracy of a cavity resonator at 40 GHz.
•Center frequency drift of a 40 GHz filter is 0.96 MHz/C°
•Design is a careful tradeoff between performance and cost
•Performance margins are needed to guarantee manufacturability and tunability.
•Fast cost microwave , accurate and flexibledesign and optimization of waveguide components.
•Cross-sections of arbitrary shape such as:
filters, T-junctions, bends, lateral coax feeds
•3D FDTD analysis(QuickWave)
•S-parameter matrices are used in circuit simulator to optimize the relative position of the elements.
•The advantage is mainly in shorter design time.
A diplexer with two asymmetric inductive iris coupled filters with integrated SMA-WR transitions and including an additional waveguide low pass filter is divided into two bandpass filters and two identical SMA-WR transitions, a waveguide low pass filter and a waveguide T-junction.
•16 times bigger memory and 64 times longer time to compute the characteristics of the complete diplexer is needed in comparison with the filter only.
- possible optimization using parametrized objects library - moderate price.
Library of UDO objects as shown below two resonator asymmetric inductive iris coupled filter with rounded corners is used in design and optimization.
13 GHz diplexer with metal post inside cavities, integrated low-pass filter and WR to SMA transitions
n=5, f tuning).0=26 GHz
n=5, f tuning).0=26 GHz
n=5, f tuning).0=26 GHz, asymmetric inductive iris coupled filter with integrated waveguide bends
X-band comb-line resonator filter with step-impedance resonators. Measured (continuous lines) and simulated (dashed lines) results.
CONCLUSIONS resonators. Measured (continuous lines) and simulated (dashed lines) results.
• examples of the design and realization of X, K and Ka band filters and diplexers have been presented,
• the design method is based on the 3D electromagnetic simulations combined with the circuit simulations,
• 3D simulations take into account effects resulting from CNC fabrication like rounded corners of resonators,
• realizations of the filters and diplexers justify the described approach and efficiency of QuickWave 3D.