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Novel hexagonal dual-mode substrate integrated waveguide filter with source-load coupling.

Ziqiang Xu1, Gen Zhang1, Hong Xia1

  • 1Research Institute of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 611731, China.

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Summary
This summary is machine-generated.

A novel hexagonal dual-mode cavity enables compact and selective substrate integrated waveguide (SIW) filters. This single-cavity design offers excellent performance with controllable transmission zeros, ideal for advanced filter applications.

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Area of Science:

  • Electromagnetics and Microwave Engineering
  • Applied Physics
  • Electrical Engineering

Background:

  • Substrate Integrated Waveguide (SIW) technology offers miniaturization and integration advantages in microwave circuits.
  • Dual-mode cavities are crucial for designing compact and high-performance filters.
  • Existing cavity designs often face trade-offs between size, performance, and design flexibility.

Purpose of the Study:

  • To introduce a novel hexagonal dual-mode cavity for SIW filters.
  • To demonstrate the design of a compact, dual-mode bandpass filter with controllable transmission zeros.
  • To validate the proposed hexagonal SIW resonator through simulation and measurement.

Main Methods:

  • Design of a hexagonal SIW resonator combining features of rectangular and circular cavities.
  • Introduction of source-load coupling to achieve controllable transmission zeros.
  • Fabrication and measurement of a demonstration filter centered at 10 GHz with a 4% fractional bandwidth.

Main Results:

  • The hexagonal SIW resonator facilitates flexible dual-mode bandpass filter design.
  • The filter exhibits good selectivity due to two controllable transmission zeros.
  • The single-cavity structure results in a significantly small filter size.
  • Measured results closely match simulated performance, validating the design.

Conclusions:

  • The hexagonal dual-mode cavity is an effective structure for developing compact and high-performance SIW filters.
  • The proposed filter design achieves good selectivity and miniaturization.
  • This work provides a valuable approach for future SIW filter development.