FEKO Lite version is free to use.

SemCAD Lite is free, Empipre XCcel also offers a free lite version. Alternatively, there is http://openems.de/start/index.php which is completely free open source.

Sonnet lite can work. But you have a limitation on the max. Memory size of the problem.

As an initial design, this simple calculator might help :)

http://www.emtalk.com/mpacalc.php

Search the websites, I'm sure you can find one.

Here is a list of free/open source FDTD codes:

http://en.wikipedia.org/wiki/FDTD#External_links

You might consider talking to AWR Corporation. They have good arrangements with universities.

You can try to use one of these two very simple softwares (both free):

http://www.ufpa.br/dee/lea/antenas.htm (in portuguese, from UFPA)

http://rze-falbala.rz.e-technik.fh-kiel.de/~splitt/html/Mstrip40LabManual.pdf

Use CST Microwave Studio, it can meet your need. If you need any assistance you can contact me

You can use puff.

There is a HFSS like software (although not that accurate and sophisticated) available in Virtual Microwave Lab of Dayalbaugh. The following is the link:

http://websupplements.net/projects/virtual_labs/

This software is very simple to use and comes with a user manual also.

Hfss..

you can use CAD FEKO for it. Also you can use

-ANTENNA MAGUS.

-Antennessa: Antenna Design

You can download HFSS crack from torrentz.eu

You may use CST-studio. HFSS,SEMcad,IE3D, antenna magus,Antenna design Kit and many more software are available in which u can design Patch antenna.

Talk to the companies if you are a registered student.

Antenna Magus

Puff

Mstrip40

Microwave Office

EMWonder etc

You can use HFSS,CST Studio and ... for design and simulation

Try Zeland IE3D, the hardware results are more compatible, u can download from torrent ver 14

There is feko 5.5 free so you can try to use it

Thank you all for the answers! Unfortunately some of these softwares are paid or have a short evaluation period. As I need the software for a graduate project, the software needs to be free or even I need to have the real license to a paid one. =/

Anyway I will list and try to test all that were recommended!

MEEP is a software developed by MIT for optics but it is the same for RF applications. It's totally free and there are plenty of tutorials and examples and instructions. It is not as easy as commercial codes to be used as you need to do a little coding. However, it is not that difficult to learn. Here is the link:

http://ab-initio.mit.edu/wiki/index.php/Meep

Good Luck with your project.

Feko Lite can be a good solution (free). The size of the problem is limited but it is enough for a microstrip patch. You just need to register on their website:

http://www.feko.info/product-detail/feko-lite

Sonnet Lite is a free feature-limited version of Sonnet's professional Sonnet Suites, which provides EM analysis to thousands of companies across the globe.

http://www.sonnetsoftware.com/products/lite/

What kind of Microstrip Patch Antenna you would like to simulate? Unfortunately, the best programs which simulate antennas are paid. Depending the kind of antenna you would like to simulate you could use HFSS from Ansoft or EMPro from Agilent. For me these two programs are the best for antenna simulation. Have you ever asked you professor about it?

Nec (http://en.wikipedia.org/wiki/Numerical_Electromagnetics_Code) is a completely free software for wire and surface antennas based on method of moments.

There are many software packages that release free of charge versions. A recently published article, in the last issue of the microwave and rf journal, provides you with more details about such softwares. You can download this article as a pdf file via the link:

http://mwrf.com/software/software-simulates-electrical-behavior?page=2

Try to use the free MultiSTRIP program.

It is written to analyze and design multilayered arbitrary shaped microstrip antennas on multiple dielectric layers. The solution is done by rigorous solution of integral equation via Galerkin Method (Moment Method) and using the correct Greens functions. Therefore all relevant effects like radiation, surface waves propagating in the substrate and dielectric losses are taken into account.

Windows version of the program MultiSTRIP (full version) is Mstrip40

http://rze-falbala.rz.e-technik.fh-kiel.de/~splitt/html/mstrip.htm

Try to use the free MultiSTRIP program.

It is written to analyze and design multilayered arbitrary shaped microstrip antennas on multiple dielectric layers. The solution is done by rigorous solution of integral equation via Galerkin Method (Moment Method) and using the correct Greens functions. Therefore all relevant effects like radiation, surface waves propagating in the substrate and dielectric losses are taken into account.

Windows version of the program MultiSTRIP (full version) is Mstrip40

http://rze-falbala.rz.e-technik.fh-kiel.de/~splitt/html/mstrip.htm

Try to use the free MultiSTRIP program.

It is written to analyze and design multilayered arbitrary shaped microstrip antennas on multiple dielectric layers. The solution is done by rigorous solution of integral equation via Galerkin Method (Moment Method) and using the correct Greens functions. Therefore all relevant effects like radiation, surface waves propagating in the substrate and dielectric losses are taken into account.

Windows version of the program MultiSTRIP (full version) is Mstrip40

http://rze-falbala.rz.e-technik.fh-kiel.de/~splitt/html/mstrip.htm

You can use CST Microwave studio or HFSS from Ansys

you can try emGine, which can be download from http://www.petr-lorenz.com/emgine/

You can use : http://www.grames.polymtl.ca/download/IDSsoftware.rar

well there are a lot of commercially available software's for the desiging microstrip patch antennas such as CST MWS, Ansoft HFSS, FEEKO, Antenna Magus, ADS.

Pl. try :http://openems.de/start/index.php. Also try Mstrip40.

use HFSS, ADS or Microwave office AWR

Firstly HFSS is suitable. then CST is good for simulations

Antenna Magus Free Evaluation version can be found at: http://www.antennamagus.com/download.php

One can use the IE3D Software,HFSS,,CST STDIO ETC.

EmGine is easy to stat with! Just give it a try if suits your need!

Evaluation license of ADS is available at Agilent's site.

You can use ADS Momentum for microstrip antenna desigh.

Good luck

Ansoft HFSS antenna design kit gives customised antenna designing of various kinds of antennas.You just need to insert the values of geometric parametres.

Can anyone please help me out where can i find HFSS antenna design kit to download and install in my pc.

HFSS & CST

The design equations can be found in Balanis' book.  That will give you the starting dimensions. Talk to Applied Wave Research about their Microwave Office Suite for simulation of the patch.

HFSS, IE3D, CST

HFSS, CST, Antenna Magus etc

FEKO lite is a free version

openEMS

You can use IE3D, HFSS, CSTMicrowave  studio etc etc etc to design micro strip antenna. 

http://www.cvel.clemson.edu/modeling/EMAG/free-codes.html

A list of All FREE EM simulation tools

HFSS is one of the better solution for Patch antenna design....

i need IE3D antenna design software. please provide direct link to download

https://www.microwaves101.com/encyclopedias/free-eda-software

http://www.rfcafe.com/vendors/components/software-antennas-electromagnetics.htm

FEKO is better option

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NEC4

HFSS, CST

FEKO, you will get free student version for 45 days.

HFSS and CST are popular, but not free........

Use CST

CST, FEKO, HFSS all are license software. Yes, but give can get a free trial version for few days.

FEKO free version is there .

https://altairuniversity.com/feko-student-edition/ (Free simulation tool for students and Teachers)

https://altairuniversity.com/free-ebooks/