Platform forum

On-Board printed Antenna

Didan , 03-18-2019, 08:24 AM
Dear forum, I've been developing a board in my company and now Im curious about how can I use altium tools to draw printed antenna on PCB. I searched for it on google but I didnt find any tutorial about how to design or how to get antenna draws for my applications, in this case I need one for Wifi/Bluetooth around 2.4Ghz and GPS around 1.565Ghz. I would like to know if there are any web calculator to help me to design it on Altium or anything which should help me to achieve this task. Thanks
batistalex , 03-19-2019, 08:16 AM
Normally when I have antennas in my projects I used to use the ceramic ones. It is not so expensive and in https://johansontechnology.com/antennas you can find a lot of materials about how to use them correctly. But if you really need to reduce the cost of your project, the size of the board is not a concern and you still want to make your own PCB antenna, I have to say that it is not so hard to find documentation about it. I think that what you are missing is to use the correct terms in your research.
For example, I just google it: "PCB antenna Bluetooth" and the first link that I got is an excellent design guide provided by NXP that explains exactly what you need to build your own PCB antenna for Bluetooth https://www.nxp.com/docs/en/user-guide/UM10992.pdf. You can use a similar term for the GPS antenna as well.

I hope that this helped you.
Didan , 03-19-2019, 08:54 AM
Hi @batistalex thanks for your tips. I know about johansontech and nxp bluetooth antenna tutorial, but I wanna to how to do it on Altium Design, I found several tutorials how to design bluetooth antenna and GPS on internet, thats not problem but anyone show how to do it on Altium Design, thats my question. What I know about antennas I studied in during my undergrad major, I used ADS software to modelling antennas but I dont know so deep how to do it, and we use ansoft design as well to simulate lot os specs, etc. I know about ceramic chips as well... Again thanks for your repply but I need how to do it on Altium Design, I know there are other softwares dedicated to model antennas, but focus on Altium.
batistalex , 03-19-2019, 06:15 PM
I don't believe that Altium has a specific feature to construct antennas in a similar way that the software that you mentioned does, at least by default (I don't know if there is some extra plugin to do that available, I have never seen one). You can do your PCB antenna in the same way that you do any footprint for a component. In this specific case, you can do the following:
1. create a new footprint
2. draw the tracks on the top layer as the documentation describes and then copy the same tracks to the top solder layer.
3. Put an SMD pad on the tip of the track that you just drew and that is all.

Is that the answer that you are looking for? Let me know.
anovickis , 03-20-2019, 12:16 PM
The approach in this book is historical and practical. It covers basic designs in more detail than other microstrip antenna books that tend to skip important electrical properties and implementation aspects of these types of antennas. Examples include: quarter-wave patch, quarter by quarter patch, detailed design method for rectangular circularly polarized patch, the use of the TM11 (linear and broadside CP), TM21 (monopole CP pattern) and TM02 (monopole linear) circular patch modes in designs, dual-band antenna designs which allow for independent dual-band frequencies. Limits on broadband matching are discussed. The appendix contains useful simple matching approaches, design details (gain, matching, sidelobes) of the little-studied omnidirectional microstrip antenna (OMA), limits and properties of common single and dual band Planar Inverted F Antenna (PIFA) antenna designs. The second edition has numerous additions to the earlier text which will make the concepts presented clearer. New cavity model analysis equations of circular polarization bandwidth, axial ratio bandwidth and power fraction bandwidth have been included. The section on omnidirectional microstrip antennas is expanded with further design options and analysis. This is also true of the section on Planar Inverted F (PIFA) antennas. The discovery and description of the fictious resonance mode of a microstrip slot antenna has been added to that section. Appendix A, on microstrip antenna substrates has been expanded to provide more detail on the types of substrate and their composition. This is often neglected in other texts. An appendix on elementary impedance matching techniques has been added as these methods have proven useful in my industrial work.

This book focuses on new techniques, analysis, applications and future trends of microstrip and printed antenna technologies, with particular emphasis to recent advances from the last decade Attention is given to fundamental concepts and techniques, their practical applications and the future scope of developments. Several topics, essayed as individual chapters include reconfigurable antenna, ultra-wideband (UWB) antenna, reflectarrays, antennas for RFID systems and also those for body area networks. Also included are antennas using metamaterials and defected ground structures (DGSs). Essential aspects including advanced design, analysis and optimization techniques based on the recent developments have also been addressed. Key Features: Addresses emerging hot topics of research and applications in microstrip and printed antennas Considers the fundamental concepts, techniques, applications and future scope of such technologies Discusses modern applications such as wireless base station to mobile handset, satellite earth station to airborne communication systems, radio frequency identification (RFID) to body area networks, etc. Contributions from highly regarded experts and pioneers from the US, Europe and Asia This book provides a reference for R&D researchers, professors, practicing engineers, and scientists working in these fields. Graduate students studying/working on related subjects will find this book as a comprehensive literature for understanding the present and future trends in microstrip and printed antennas.

"This anthology combines 15 years of microstrip antenna technology research into one significant volume and includes a special introductory tutorial by the co-editors. Covering theory, design and modeling techniques and methods, this source book is an excellent reference tool for engineers who want to become more familiar with microstrip antennas and microwave systems. Proven antenna designs, novel solutions to practical design problemsand relevant papers describing the theory of operation and analysis of microstrip antennas are contained within this convenient reference."

Learn how to quickly solve electromagnetic scattering problems using the Moment Method with this valuable self-study package. The clearly written book provides examples of Moment Method problems, reviews the numerical techniques required to solve them, and demonstrates the use of the moment method in solving scattering from basic shapes, including: wires, two-dimensional strips and contours, and flat plates.

robertferanec , 03-21-2019, 07:10 AM
As @batistalex is suggesting, there is nothing special about drawing antennas in Altium. What is important is to follow the design guides and recommendations - these will usually tell you the shape, size, etc. As an example I copied the instructions from the document what @batistalex attached - you will need to find the specific antenna and you need to follow the recommendations (you may want to be sure that you follow instructions not only for the shape of the antenna but also PCB stackup recommendations).

So here are some examples what you may need to search for and follow from the document (depends on your antenna):

The dielectric constant for the FR4, substrate is 4.4, the thickness is 0.5mm.

Here are some other examples from the document (just to give you ideas what you may want to be careful about):
1. The feed arm should be fed with a 50ohm CPWG transmission line. The length of the
transmission line should be as short as possible. The transmission line can be
covered by mask.
2. The short arm should be connected to the reference ground plane with at least 2 vias.
3. The ground plane under the antenna should be removed.
4. The solder-mask plane on and under the antenna should be added.
5. The ground plane on the different layers should be connected together by vias along
the ground plane edge.
6. The dimension of the ground plane is as important as the antenna dimension itself.
7. The layout of the matching net should not alter the impedance of transmission line.
8. One “T” or pie matching net is generally enough for all kinds of antennas. The
matching net should be as simple as possible.

Use our interactive Discord forum to reply or ask new questions.
Discord invite
Discord forum link (after invitation)

Didn't find what you were looking for?