# 电磁热仿真中有哪些不同的激励方式？

2023年 5月 5日

### 为什么损耗会随频率变化?

Q = \frac{1}{2}I_0^2\mathbb{R}(Z_s),

1 3807.2-436.4i 3807.0-436.3i
2 3664.6-840.0i 3664.3-839.8i
5 2903.6-1663.2i 2903.5-1662.9i
10 1668.4-1909.9i 1668.4-1909.4i
20 618.13-1414.1i 618.19-1413.3i
50 114.38-653.8i 114.48-652.2i
100 29.249-334.4i 29.367-331.1i

S_{11} = \left(Z_s-Z_0\right)/\left(Z_s+Z_0\right),

Q = P_{applied}\left( 1-\left| S_{11}\right|^2\right).

### 电压激励

\begin{Bmatrix} E_x\\E_y\\E_z\end{Bmatrix}=\frac{V_0}{\log(r_0/r_i)(x^2+y^2)}\begin{Bmatrix} x\\y\\0\end{Bmatrix}.

Q = \frac{1}{2}V_0^2/\mathbb{R}(Z_s).

### 将固定功率输入模型

1. 使用一个通过全局方程 定义的变量指定激励。
2. 全局方程 写一个更新的表达式，它将在求解过程中迭代更新激励的大小。
3. 确保使用分离式求解器，以使全局方程 作为一个单独的步骤进行求解。

I_applied-nojac(if(intopSample(ec.Qh)==0,10[mA],I_applied*sqrt(50[mW]/intopSample(ec.Qh)))).

### 结束语

#### 评论 (3)

##### Gentle Lee
2024-03-03

Please ask how to add a closed annular microwave excitation port (similar to the inner surface of a cylinder) in the simulation of microwave heating. It’s important to me, thanks！！！

##### Min Yuan
2024-03-06 COMSOL 员工

Depending on the description it might look like the following model: https://cn.comsol.com/model/dipole-antenna-8715 .If not, it is recommended to describe the background of your model in detail through the technical support email so that engineers can know the specific requirements: https://cn.comsol.com/support

2024-03-11

thinks！！！