International Journal of Advanced Culture Technology

The International Promotion Agency of Culture Technology (국제문화기술진흥원)
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Small-size Rat-race Ring Coupler Using Connected Coupled-line

  • Received : 2019.01.28
  • Accepted : 2019.03.10
  • Published : 2019.03.31
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Abstract

In order to improve performance for the size of the rat-race ring coupler, the CCL is used for the realization as the delay line. As realizing lower coupling coefficient, the ratio of the size-reduction for the CCL is enhanced. The CCL is alternated with ${\lambda}_g/4$ of the rat-race ring, and optimized two CCLs are inserted for the size-reduction. the coupling coefficient is 0.2, and electrical lengths of each CCL are $28.2^{\circ}$ and $21.7^{\circ}$. Designed rat-race ring using the CCL has the size of $18.76{\times}20.45mm^2$ and the size-reduction ratio of fabricated rat-race ring using the CCL has 76.8%. Also, fabricated rat-race ring is measured the insertion loss of 3.20dB at the center frequency of 2.45GHz and the 20dB bandwidth is 24.04%. Differenced magnitude and phase between threw port and coupled port are measured 0.1dB and $177.4^{\circ}$, respectively. These performances are almost same compared with the conventional rat-race ring. Suggested application of the CCL can be used various devices and circuits for the size-reduction.

Keywords

E1GMBY_2019_v7n1_225_f0001.png 이미지

Figure 1. Even and odd-mode configuration of the CCL

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Figure 2. Characteristics of loss of the CCL as the coupling coefficient and impedance

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Figure 3. Characteristics of phase of the CCL as the electrical length

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Figure 4. Photograph of fabricated the rat-race ring using the CCL

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Figure 5. Simulated and measured results of the rat-race ring using the CCL

E1GMBY_2019_v7n1_225_f0006.png 이미지

Figure 6. Measured results of differenced magnitude and phase of the rat-race ring

References

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