VSWR, rov poob (RL), rov qab muaj zog, thiab xa hluav taws xob

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

### **Core Formulas**
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. ** Rov Los Loss (RL)** hauv dB:

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

4. **Reflected Power (%)**:

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

5. ** Fais fab kis (%)**:

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

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### ** Cov kauj ruam hloov dua siab tshiab **
#### ** 1. Pib nrog VSWR **:
- Xam Γ:

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

- Siv Γ txhawm rau nrhiav RL, pom lub zog, thiab xa hluav taws xob siv cov qauv saum toj no.

#### ** 2. Pib nrog Rov Los Loss (RL hauv dB)**:
- Xam Γ:

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

- Siv Γ los nrhiav VSWR, pom lub zog, thiab lub zog xa mus.

#### 3. Pib nrog Reflected / Transmitted Power **:
- Rau **reflected power** (\(P_{\text{ref}}\)):

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

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

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

- Siv Γ los suav VSWR thiab RL.

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### ** Cov lus piv txwv **
| **VSWR** | ** Rov Los Poob (dB)** | **Reflected Power (%)** | **Kev xa hluav taws xob (%)** |
| ---------------------- | ----------------------------------------------- |
| 1.0 | ∞ (zoo meej match) | 0% | 100% |
| 1.5 | 14.0 dB | 4% | 96% |
| 2.0 | 9.5dB | 11.1% | 88.9% |
| 3.0 | 6.0 dB | 25% | 75% |

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### ** Cov Lus Cim Tseem Ceeb **
- A ** VSWR ntawm 1: 1 ** txhais tau tias tsis muaj kev xav (Γ = 0, RL = ∞).
- ** Siab dua VSWR ** lossis ** qis RL ** qhia tias muaj zog dua.
- ** Lub zog xa hluav taws xob ** yog qhov siab tshaj plaws thaum VSWR ≈ 1.

Siv cov qauv no los hloov pauv ntawm qhov tsis sib xws rau impedance txuam hauv RF systems.