# Xingda Chen

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Question

The direction of current distribution on antenna surface isn't along the antenna surface, simulation mistake from MATHWORK?

I was trying the example provided by Mathwork (MATLAB, antenna toolbox) h = loopCircular; current(h,70e6,'Direction','on'); ...

20 days ago | 1 answer | 0

### 1

answerQuestion

Does MATLAB's pattern() function use full-wave MoM or superposition of elements for antenna array analysis?

This question is probably more for MATLAB staffs but I am open to any response. I am conducting research to compare the results...

5 months ago | 0 answers | 0

### 0

answersQuestion

What are the point locations for EHfields() function output?

When I run the EHfields function like this: [e,h] = EHfields(antenna_object,frequency) The size of the output e is 3 * 441. Wh...

10 months ago | 2 answers | 0

### 2

answersQuestion

How does the createFeed() by GUI (antenna toolbox and selecting a closed polygon) work as an excitation source?

I am experimenting with MATLAB antenna tool box. The simulation result of a geometry differs quite a bit when I use a simple del...

1 year ago | 0 answers | 0

### 0

answersHow to introduce a phase shift to a existing vector

Perhaps this is what you are looking for: p_freq = 5e3; p_period = 1/p_freq; %you have to know your frequency move_this_many_s...

2 years ago | 0

which solver is best to solve a set of trig equation?

I realized I cannot simiply log a complex number. I am editing my script such that my a+bj complex number returns an angle readi...

2 years ago | 0

| accepted

Question

which solver is best to solve a set of trig equation?

I wonder if existing MATLAB solvers can solve my set of trignometric equations: For the above equations, assume I know , , ...

2 years ago | 1 answer | 0

### 1

answerhow to make sure the normal vector of phase.ConformalArray is the same as normal vector of antenna element?

I used a simple but dumb way by setting my element number to be 1 and compare the generaqted pattern with the original pattern t...

2 years ago | 0

| accepted

Question

how to make sure the normal vector of phase.ConformalArray is the same as normal vector of antenna element?

I am creating a conformal array of microstrip patch antenna using the phase array system toolbox. I first created a single a...

2 years ago | 1 answer | 0

### 1

answeralternate hist() function

a = [4 4]; b=unique(a); c=hist(a,b); c=nonzeros(c); d=find(c~=0); result=a(d); I got a simple ...

3 years ago | 0

| accepted

Question

alternate hist() function

I wanted to know how many times a number is repeated in a vector, so I used the hist() function. For example, an extracted idea...

3 years ago | 1 answer | 0

### 1

answerQuestion

check ismember for each element individually

Hello all, I wonder if there is any smart way checking the indices of every individual elements in an array, in another array. ...

3 years ago | 3 answers | 0

### 3

answersQuestion

set(gca,'fontsize',[]) reporting error

Hi all, I bumped into a simple problem but I do not know what is going on. I was trying to make a plot and seting up the font s...

3 years ago | 2 answers | 0

### 2

answersQuestion

what is the best way to model a noise effected wired ASK communication on Matlab?

I want to model/simulatE how 60Hz AC power EMI affected an ASK modulated wired transmission, preperrably see the distrotion in t...

4 years ago | 0 answers | 0

### 0

answersQuestion

how to plot data from a cell array that the numbers are type string?

Hi, I want to plot some lab data. they are collected in txt file, the data itself in txt looks like this I want to plot ...

4 years ago | 1 answer | 0

### 1

answerQuestion

matlab does not plot the from origin

trying to plot my lab result, but the first data point suppose to be (0,0) , can't make matlab plot that....does this happen to ...

4 years ago | 0 answers | 0

### 0

answersQuestion

Error in naming function handles

Hi all, I am writting a Runge Kutta for a time varying system of ODEs, but bumped into an error of indexing. I think the proble...

4 years ago | 1 answer | 0