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High-directivity and compact microstrip coupler for RF power applications.

Cheng-Hsuan Chan1, Tsung-Chi Yu2, Tsun-Hsu Chang1

  • 1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.

The Review of Scientific Instruments
|October 20, 2023
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Summary
This summary is machine-generated.

A novel compact microstrip directional coupler was developed for monitoring high-power amplifier modules. This device offers wide bandwidth and high directivity, proving effective in demanding radio frequency applications.

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Area of Science:

  • Electrical Engineering
  • Radio Frequency (RF) Engineering

Background:

  • High-power solid-state transmitters require accurate monitoring of amplifier module performance.
  • Existing power monitoring solutions may lack compactness, wide bandwidth, or temperature stability.

Purpose of the Study:

  • To design, fabricate, and test a compact microstrip directional coupler for monitoring kW-level amplifier modules.
  • To evaluate the coupler's performance in terms of coupling, directivity, insertion loss, and bandwidth under varying power levels.

Main Methods:

  • A multi-section coupled line structure with a reverse-coupling scheme was employed.
  • A dual-side configuration with good termination was utilized to enhance directivity and bandwidth.
  • Low-power and high-power (1 kW) tests were conducted to assess performance characteristics.

Main Results:

  • The coupler demonstrated a coupling of 37.69 dB with high directivity across a wide frequency range (82-700 MHz).
  • Coupling remained stable at 499.65 MHz under varying power levels.
  • At 1 kW input power, directivity was 33.85 dB and maximal insertion loss was 0.08 dB.

Conclusions:

  • The designed microstrip directional coupler is compact, offers high directivity and wide bandwidth, and is suitable for high-power RF applications.
  • The device exhibits good temperature stability due to the absence of lumped components.
  • Its performance makes it ideal for monitoring kW-level amplifier modules in solid-state transmitters, particularly in low-frequency applications.