VSWR, rov qab poob (RL), lub zog cuam tshuam, thiab lub zog xa tawm

Cov kev sib raug zoo ntawm Voltage Standing Wave Ratio (VSWR), rov qab poob (RL), lub zog cuam tshuam, thiab lub zog xa tawm yog sib txuas los ntawm cov coefficient cuam tshuam (Γ). Hauv qab no yog cov qauv tseem ceeb thiab cov kauj ruam rau kev hloov pauv:

### **Cov Qauv Tseem Ceeb**
1. **Reflection Coefficient (Γ)**:

\Gamma = \frac{\text{VSWR} - 1}{\text{VSWR} + 1}

2. **VSWR** los ntawm Γ:

\text{VSWR} = \frac{1 + |\Gamma|}{1 - |\Gamma|}

3. **Kev Poob Rov Qab (RL)** hauv dB:

\text{RL (dB)} = -20 \log_{10}(|\Gamma|)

4. **Lub zog cuam tshuam (%)**:

P_{\text{refl}} = |\Gamma|^2 \times 100\%

5. **Lub Hwj Chim Xa Mus (%)**:

P_{\text{trans}} = \left(1 - |\Gamma|^2\right) \times 100\%

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### **Cov Kauj Ruam Hloov Pauv**
#### **1. Pib nrog VSWR**:
- Xam Γ:

\Gamma = \frac{\text{VSWR} - 1}{\text{VSWR} + 1}

- Siv Γ los nrhiav RL, lub zog cuam tshuam, thiab lub zog xa tawm siv cov qauv saum toj no.

#### **2. Pib nrog Kev Poob Rov Qab (RL hauv dB)**:
- Xam Γ:

|\Gamma| = 10^{-\text{RL}/20}

- Siv Γ los nrhiav VSWR, lub zog cuam tshuam, thiab lub zog xa tawm.

#### **3. Pib nrog Lub Hwj Chim Reflected/Transmitted**:
- Rau **lub zog uas cuam tshuam** (\(P_{\text{refl}}\)):

|\Gamma| = \sqrt{\frac{P_{\text{refl}}}{100}}

- Rau **lub zog xa** (\(P_{\text{trans}}\)):

|\Gamma| = \sqrt{1 - \frac{P_{\text{trans}}}{100}}

- Siv Γ los xam VSWR thiab RL.

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### **Piv txwv Rooj**
| **VSWR** | **Kev Poob Rov Qab (dB)** | **Lub Hwj Chim Uas Tau Cuam Tshuam (%)** | **Lub Hwj Chim Xa Mus (%)** |
|----------|-----------------------|------------------------|---------------------------|
| 1.0 | ∞ (Kev sib phim zoo meej) | 0% | 100% |
| 1.5 | 14.0 dB | 4% | 96% |
| 2.0 | 9.5 dB | 11.1% | 88.9% |
| 3.0 | 6.0 dB | 25% | 75% |

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### **Cov Lus Qhia Tseem Ceeb**
- Ib qho **VSWR ntawm 1:1** txhais tau tias tsis muaj kev cuam tshuam (Γ = 0, RL = ∞).
- **VSWR siab dua** lossis **RL qis dua** qhia tau tias muaj zog cuam tshuam ntau dua.
- **Lub zog xa tawm** yog qhov siab tshaj plaws thaum VSWR ≈ 1.

Siv cov qauv no los hloov pauv ntawm cov kev teeb tsa rau kev sib phim impedance hauv RF systems.