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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

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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


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Outline cost microwave

1. Introduction

2. Segmentation and E-M simulations

3. Examples

- 13 GHz and 15 GHz diplexers

- filter and 26 GHz filter

- filters for DBS Block Up Converters

- combline X-band filter

4. Conclusions


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•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


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•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.


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•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.


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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.


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•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.

•QuickWave 3D

- accuracy,

- speed,

- possible optimization using parametrized objects library - moderate price.


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Library of UDO objects as shown below two resonator asymmetric inductive iris coupled filter with rounded corners is used in design and optimization.


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13 GHz diplexer with metal post inside cavities, integrated low-pass filter and WR to SMA transitions





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n=5, f tuning).0=26 GHz

Measured characteristics

(without tuning).


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n=5, f tuning).0=26 GHz

Measured

characteristics

(after tuning).


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n=5, f tuning).0=26 GHz, asymmetric inductive iris coupled filter with integrated waveguide bends








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X-band comb-line resonator filter with step-impedance resonators. Measured (continuous lines) and simulated (dashed lines) results.


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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.


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