Advanced radio & antennas

Great wireless connections need great radio and antennas

Jonas Strandell is Co-founder, COO and R&D Manager of WSI. He has many years of experience in antenna design, which is core in many of WSIs’ successful projects.

– Antenna design is in many senses different compared to other kind of electrical design work. It is often considered strange, difficult and even a bit magical! Here at WSI we have a strong team of highly experienced antenna designers and we have all kinds of test equipment and measurement chambers needed to do the job. We work with simulation tools as well as cutting copper tape with a scalpel based on many years of experience, to find the optimal solution for our customers! Small size embedded antennas as well as large size array antennas for base stations. From NFC frequencies up to 6 GHz and even above.

Equipment and Chambers

We have the machine park it takes.

To characterize the antenna performance in full a set of test equipment and measurement chambers are required. WSI has everything required within our own facilities.

Anechoic chamber

In the anechoic chamber we measure Radiation Patterns in both two and three dimensions as well as Antenna Gain. This type of testing is done to determine radiation in different directions in the development of any kind of wireless devices and is also needed for Type Approval.

Scattered Field Chamber

In the scattered field chamber we perform Antenna Efficiency measurements as well as TRP (total radiated power) and TIS (total isotropic sensitivity) measurements. These parameters are of great importance to be able to launch 2G, 3G and 4G products in carrier networks worldwide. Network carriers like Vodaphone, Sprint and AT&T put strict requirements on this kind of parameters.

SAR (specific absorption ratio) measurements

Strict requirements are put on the levels of electro-magnetic field a product is allowed to expose the human body to. At WSI we have a so called SAR test system to do these kinds of measurements. SAR stands for specific absorption ratio. A bath tub formed as the human body is filled with a special liquid to simulate human tissue. A robot is used to measure the electro-magnetic field in the bath tub while being exposed to the radiation of the device under test which could be a mobile phone or any kind of body worn wireless device.

WSI is one of only few in Scandinavia who can perform these kinds of measurements.

WSI on future antennas

Products reaching the market tend to be filled with more and more wireless technologies, this in smaller, thinner and sleeker form factors. Also future wireless technologies utilizing MIMO (multiple input multiple output) require multiple antennas instead of just one antenna.

This is an extreme challenge for antenna designers but also our strength. Though simulations and our long experience, optimal antenna positions and antenna technologies will be found.

Antenna design tends to be considered in a very late stage of the design work which is unfortunate. This may lead to both poor performance and problems during type approvals and certification, causing unnecessary delays and increased cost. The proper way would be to consider antenna design already when setting the industrial design and floor plan of a new product, says Jonas Strandell, R&D Manager, WSI.

Regulatory

Before introducing a new product into the market there are a number of Type Approval tests and Certifications required. These tests and certificates varies depending on the features of the product as well as on which markets the product shall be launched into. In general testing will be more extensive for products containing any kind of radio technology. Products launched in Europe need the CE mark, product launched in US need the FCC mark or a FCC ID, Bluetooth products need to be tested for compatibility and be listed by the Bluetooth SIG etc. WSI work in close collaboration with accredited test houses like Intertek, Cetecom, Delta etc. for both pre-compliance testing of prototypes as well as full type approval testing of the ready-made product. Pre-compliance testing according to the Bluetooth standard is done in-house at WSI. We also support the customer with documentation associated with the Type Approvals such as Technical Construction File, Declaration of Conformity etc.

Bluetooth technology is the global wireless standard enabling the Internet of Things (IoT). We have been working a long time with Bluetooth and are a member of the Bluetooth SIG (Special Interest Group).

www.bluetooth.com

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By affixing the CE marking to a product, a manufacturer declares that the product meets all the legal requirements for CE marking and can be sold throughout the EEA.

CE Marking homepage

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The Federal Communications Commission regulates interstate and international communications by radio, television, wire, satellite, and cable in all 50 states, the District of Columbia and U.S. territories.

www.fcc.gov

Wi-Fi Alliance is a non-profit organization that promotes Wi-Fi technology and certifies Wi-Fi products if they conform to certain standards of interoperability.

www.wi-fi.org