# 电气工程代写|通讯系统作业代写communication system代考|EE179

## 电气工程代写|通讯系统作业代写communication system代考|The THz Domain

Telecommunications include all techniques for transporting data. As current speeds are soon to he exceeded, the emergence of new ultra-fast applications is pushing scientists to develop increasingly fast solutions and systems.

With all these developments, the magnetic spectrum becomes saturated. The research is directed towards bands not (or rarely) allocated in the terahertz domain.
The technological issue is therefore to design active filters that are integrable, reconfigurable, and inexpensive.

The objective of our work is to set up a filter that can be integrated, reconfigured, and intended for $\mathrm{THz}$ wireless communication (Fig. 1). Before presenting this study,

let us recall some bibliographical elements on the THz domain (advantages, filters, and applications).

For a long time, the researchers developed all types of components and filters at microwave and visible spectrum without taking advantage of the terahertz band, which has undeniable advantages over others.

This area has only been in use for about twenty years [6]. One of the reasons lies in the absence of integrated and tunable filters at a time.
We will start by presenting the different applications using Terahertz waves.

## 电气工程代写|通讯系统作业代写communication system代考|Preliminary 10-Element Series Fed Antenna Array

Figure 1 shows the 10 -element symmetric series fed antenna array printed on silicon dioxide substrate with height given as $h_{\text {sub }}(0.06 \mathrm{~mm})$ and the overall dimension of the antenna being $L_{\text {sub }} \times W_{\text {sub }} \mathrm{mm}^2$. The non-uniform radiating patch array is printed on one plane of the substrate of dimensions $2 \mathrm{~mm} \times 5 \mathrm{~mm} \times 0.06 \mathrm{~mm}$ and full ground on the opposite plane. The conducting material (patch and ground) is gold with thickness $5 \mu \mathrm{m}$, and silicon dioxide exhibits a relative permittivity $\left(\varepsilon_{\mathrm{r}}\right)$ of 4 . The antenna array is designed for $300 \mathrm{GHz}$ as the center frequency. The non-uniform symmetric antenna array shown in Fig. 1 is designed by using Dolph-Tschebyscheff array polynomials where the key parameters like array elements length $(l)$, and width $\left(W_1, W_2, W_3, W_4\right.$ and $W_5$ ) are obtained from following equations [11, 23-25]. Free space wavelength $(\lambda)$ as given by Eq. (1), length of each element $(l)$ as given by Eq. (2) and $\varepsilon_{\text {reff }}$ as given by Eq. (3) are used.
$$\begin{gathered} \lambda=\frac{c}{f}=\frac{3 \times 10^{11}}{300 \times 10^9}=1 \mathrm{~mm} \ l=\frac{\lambda}{2 \sqrt{\varepsilon_{\text {reff }}}}=\frac{1}{2 \sqrt{\varepsilon_{\text {reff }}}} \ \varepsilon_{\text {reff }}=\frac{\varepsilon_{\mathrm{r}}+1}{2}+\frac{\varepsilon_{\mathrm{r}}-1}{2}\left[1+\frac{12 h_{\text {sub }}}{W_1}\right]^{1 / 2} \end{gathered}$$
where $W_1$ is width of center element of the array and is calculated by Eq. (4) given as,
$$W_1=W=\frac{c}{2 f \sqrt{\frac{\varepsilon_r+1}{2}}}=0.3162 \mathrm{~mm}$$
By applying $\varepsilon_{\mathrm{r}}=4, f=300 \mathrm{GHz}$ in Eqs. (4) and (3) we get $W_1=0.3162 \mathrm{~mm}$, $\varepsilon_{\text {reff }}=7.415$. Assuming major-to-minor lobe ratio of $30 \mathrm{~dB}$ (31.63 (abs)), knowing the length $(l)=0.183 \mathrm{~mm}$ from Eq. (2) the array factor $(\mathrm{AF}){10}$ is calculated. Spacing between elements $(d)$ as $0.25 \mathrm{~mm}(\lambda / 4)$, length of feed line $\left(l{\mathrm{f}}\right)$ as $0.5 \mathrm{~mm}(\lambda / 2)$, feed line width $\left(W_{\mathrm{f}}\right)$ as $0.25 \mathrm{~mm}$ and strip line width $(a)$ as $1 \mathrm{~mm}$ are considered. The computation of $(\mathrm{AF})_{10}$ for even number of elements [23-25] is given as,

$$\mathrm{AF}{2 M}(\text { Even })=\sum{n=1}^M a_n \cos [(2 n-1) u]$$
For 10 elements array, $2 M=10 ; M=5$

# 通讯系统代考

## 电气工程代写|通讯系统作业代写communication system代考|Preliminary 10-Element Series Fed Antenna Array

$2 \mathrm{~mm} \times 5 \mathrm{~mm} \times 0.06 \mathrm{~mm}$ 并在对面平面上完全接地。导电材料 (贴片和接地) 是金，厚度 $5 \mu \mathrm{m}$ ，二氧化 硅表现出相对介电常数 $\left(\varepsilon_{\mathrm{r}}\right) 4$ 。天线阵列设计用于 $300 \mathrm{GHz}$ 作为中心频率。图 1 所示的非均匀对称天线阵 列是利用 Dolph-Tschebyscheff 阵列多项式设计的，其中关键参数如阵元长度 $(l)$, 和宽度
$\left(W_1, W_2, W_3, W_4\right.$ 和 $\left.W_5\right)$ 由以下等式 [11, 23-25] 获得。自由空间波长 $(\lambda)$ 如方程给出的。(1)、每个元㭌的 长度 $(l)$ 如方程给出的。 $\left(2\right.$ 和 $\varepsilon_{\text {reff }}$ 如方程给出的。(3) 使用。
$$\lambda=\frac{c}{f}=\frac{3 \times 10^{11}}{300 \times 10^9}=1 \mathrm{~mm} l=\frac{\lambda}{2 \sqrt{\varepsilon_{\text {reff }}}}=\frac{1}{2 \sqrt{\varepsilon_{\text {reff }}}} \varepsilon_{\text {reff }}=\frac{\varepsilon_{\mathrm{r}}+1}{2}+\frac{\varepsilon_{\mathrm{r}}-1}{2}\left[1+\frac{12 h_{\text {sub }}}{W_1}\right]^{1 / 2}$$

$$W_1=W=\frac{c}{2 f \sqrt{\frac{\varepsilon_r+1}{2}}}=0.3162 \mathrm{~mm}$$

$$\operatorname{AF} 2 M(\text { Even })=\sum n=1^M a_n \cos [(2 n-1) u]$$

myassignments-help数学代考价格说明

1、客户需提供物理代考的网址，相关账户，以及课程名称，Textbook等相关资料~客服会根据作业数量和持续时间给您定价~使收费透明，让您清楚的知道您的钱花在什么地方。

2、数学代写一般每篇报价约为600—1000rmb，费用根据持续时间、周作业量、成绩要求有所浮动(持续时间越长约便宜、周作业量越多约贵、成绩要求越高越贵)，报价后价格觉得合适，可以先付一周的款，我们帮你试做，满意后再继续，遇到Fail全额退款。

3、myassignments-help公司所有MATH作业代写服务支持付半款，全款，周付款，周付款一方面方便大家查阅自己的分数，一方面也方便大家资金周转，注意:每周固定周一时先预付下周的定金，不付定金不予继续做。物理代写一次性付清打9.5折。

Math作业代写、数学代写常见问题

myassignments-help擅长领域包含但不是全部: