Time Pressure Monitoring System (TPMS) Antenna Simulation with Ansys HFSS - Part 1: Antenna Simulation
Hello everyone, this is Daniel Esmaili. I'm going to present a model for TPMS, which is the Tire Pressure Monitoring System, on behalf of Ozen Engineering, Inc. In this presentation, we will cover several steps to complete the model.
Overview
- Introduction to TPMS
- Weeb and Helix Antenna
- Solution Steps
- Different Phases to Complete the Model
- Results and Model Setup
- Next Steps: Using EMIT Software for Link Budget Calculation
What is TPMS?
TPMS is a device consisting of an antenna and a circuit board with a sensor inside car tires. It detects tire pressure and transmits the information to the car, allowing the driver to see the pressure of different tires on the dashboard. It is recommended for:
- Improving fuel efficiency
- Enhancing safety by preventing accidents
- Saving money in the long term
Since 2018 in the US and 2012 in November for passenger cars, TPMS is required by law.
Antennas Used in TPMS
The main antenna used in TPMS is the Helix Antenna. It is housed inside the valve stem for radiation and protection. The helix design is universal and provides more gain.
Simulation Setup
We used a whip antenna model with the following setup:
- Ground and whip antenna on top
- Added helix antenna with adjustable parameters
Simulation Steps
- Create the antenna geometry.
- Run simulations and tune parameters for optimal performance.
- Integrate with the rim and tune again.
- Add the car box and perform further tuning.
- Include the receiver antenna and process results.
Tuning Parameters
Key parameters for tuning the antenna include:
- Length of the whip antenna
- Number of turns in the helix
- Gap between turns
- Radius of turns
We experimented with various parameters to achieve the best S11 value, targeting around 315 MHz, which is standard for the car industry.
Initial Results
The initial run showed promising results with an S11 value of about -10 dB. The simulation focused on the antenna only, without the rim or car box.
For more details, please check the next video in the series.
Hello everyone, this is Daniel Esmaili. I'm going to present a model for the Time Pressure Monitoring System (TPMS) on behalf of Ozen Engineering Inc. In this model, we will cover a few steps to create a completed model.
Initially, we will discuss what TPMS is and then the Weeb and Helix antenna, solution steps, and different phases to complete the model. At the end, we will show the result as well as some setup of the model.
We will then explain the next step, which is using the EMIT software to calculate some link budget. For those who don't know what TPMS is, it's a device, specifically an antenna with a circuit board that is an NS sensor, located inside the car tires, for commercial or small or big vehicles.
All of them should have it. The TPMS detects the pressure inside the tire and transmits that information to the car. The driver can see different tires and their pressure in the cluster.
TPMS is recommended because previously, it was a good thing to have, but recently, there is a rule that only passenger cars may be allowed to drive on the road as of 2018 in the US and as of 2012 in November. This is due to street mobilization, which may cause more wrinkles on the road.
The TPMS helps in case of any crisis, as it can detect transmission issues immediately. It also helps with fuel efficiency and saves drivers in the long term by reducing fuel consumption. There are different antennas used in TPMS, with the main one being the Helix antenna.
The Helix antenna goes inside the valve and the valve stem is used to house the antenna for radiation and protection. It should be something universal that works for all tires, making it the best geometry. The Helix antenna also helps with having more gain.
In this simulation, we use the same concept with a whip antenna, which has a ground and a whip antenna on top. We added a Helix antenna, and there are different parameters for this Helix antenna that will have different favorite positions in the model.
We can set the water level or other touchpoints, and there are three different levels of axial and rotating levels to semitEPA. In the simulation, we did some functional legislation for each model.
For example, if we consider the way this one is set, with the associated upper body and lower body, and a hole for the antenna, we can see the associated parameters. We will then talk about the simulation, which has different steps from a simple model to a complex one.
First, we create the geometry of the antenna and run the simulation. We tune the antenna in each step to ensure we get the best S 11. We do the same thing with the rim and tune it again. We then add the car box and tune it again.
Finally, we add the last antenna, which is the receiver on channel, and show it in processing. When simulating the antenna only, we start with the antenna and its different parameters that can be changed to tune the antenna.
The main parameters are the length of the whip antenna, the number of turns of the antenna, the length of the helix antenna, the gap between each turn, and the radius for all turns. We use these different parameters to tune the antenna. Once we run the simulation, we try many different parameters.
We then end up with the initial run, which gives us the best S 11. Our goal is to reach 315 megahertz, which is the standard for the car industry, and -10 db. In the initial run, we have the same antenna, just with different planes.
We can see the E-field and have a better visualization of the antenna. At this point, it's only the antenna, with no rim or car box. Once we're happy with the result, we move on to the next step. Please feel free to check the next step in the next video.
