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TechWaTch
Eliminating Latency in Wi-Fi 6E Devices
By Jeff Elliott W
hen Wi-Fi 6 (IEEE 802.11ax) was introduced, the stan- dard was initially designed
to operate within the licensed ex- empt bands between 1 and 6 GHz. Then, earlier this year, the FCC an- nounced it was adopting rules to open the 6 GHz band (5.925 to 7.125 GHz) for unlicensed use in Wi-Fi 6 devices as well. The move further boosts the ex-
pectations for increased speed be- yond the 30 to 40 percent already es- timated, along with a significant boost in bandwidth. Yet, one of Wi- Fi’s most enduring problems has been latency — the delay in time re- quired to transmit and receive large amounts of information.
However, the expansion of the
available frequencies for the new Wi- Fi 6 standard, Wi-Fi 6E, is only part of the puzzle when it comes to reduc- ing latency. “Latency is still an issue for certain applications,” explains Manuel Carmona, senior RF product and business development manager, Johanson Technology. “For example, there is a 300 to
400 millisecond latency for online videoconferencing. Wi-Fi 6 and 6E, combined with extremely low latency RF components will resolve a lot of these issues,” he continued.
Bandpass Filters Among the most critical compo-
nents for any RF wireless device are
the bandpass filters that keep the signal within the assigned frequen- cies outlined by the FCC. To meet these new requirements and stay within the specified frequencies, Wi- Fi RF chipsets are required that can deliver the proper filtering for opti- mum FCC/ETSI compliance in a small footprint. However, this can be a
Quality Solutions for Complex EMI/RFI and EMC Filter Requirements
challenge given the proximity of the original Wi-Fi 6 frequen- cies to those of the 802.11ac and with Wi-Fi 6E to ultra- wideband among other active bands within the vicinity of the spectrum. “It is a challenge to design a sharp enough band- pass filter to reject the unwanted fre- quencies right next to those you want to pass through,” says Carmona. “You need a really sharp skirt, so the filter is more selective. Usually, that requires more expensive technolo- gies, such as SAW, BAW or FBAR.” Today, there are passive SMT
bandpass filters now being developed by component manufacturers, like Johanson, to meet the new Wi-Fi 6E standard that are cost-effective, have low insertion loss and are available in small footprints. Johanson has released its first
ceramic SMT bandpass filter, which has a pass band of 5,925 to 7,125 MHz, while rejecting other interfer- ing bands. The component is made with a
novel, proprietary ceramic material in an LTCC manufacturing process, designed to improve performance similar to high-Q standards perform- ance. The Q factor is a unitless nu- merical value that represents the performance of an RF component.
Saving PCB Space The bandpass filter is packaged
Turn-key and fully integrated approach to design and fabrication of precision electronic components, assemblies and subsystems.
High reliability multi-circuit and discreet feed-through (F/T) input, output, power aerospace applications. WEMS is AS9100D and ISO 9001:2015 registered.
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in a monolithic, cost-effective device called an integrated passive compo- nent (IPC). IPCs are electronic sub- systems that combine multiple dis- crete passive components into a sin- gle SMT device that dramatically re- duces the board space required. With this approach, there is a
single low-profile package that is less than 20 percent of the size of a simi- lar circuit comprising individual components. IPCs are available for almost
any kind of passive circuit, including low- and high-pass filters, diplexers, triplexers,
impedance matched
baluns, balun-filters bandpass fil- ters, couplers, and other custom sig- nal conditioning circuits. “With PCB real estate at a pre-
mium, the size and placement of the passive components are critical. As everything gets smaller it becomes increasingly difficult to place more components on the board,” says Car- mona. “Therefore, design engineers are looking to component manufac- turers to deliver miniaturized solu- tions that occupy next to no real
Today’s SMT bandpass filters
meet the new Wi-Fi 6E standard, are cost-effective, have low
insertion loss, and are available in small footprints.
board space.” Another advantage of the high-
Q SMT bandpass filter is that as a passive device it does not require DC voltage, increasing the battery life of the device.
Reducing Latency The reduction in latency is also
expected to impact the number of users that can be connected at the same time, or client density. This is another key objective of Wi-Fi 6 giv- en the continued proliferation of smart home devices, wearables and other connected electronics. Wi-Fi 6 is designed to allow net-
work access points like routers to communicate more efficiently with more users and devices at once. Wi- Fi 6 routers can pack more informa- tion into each signal they send. In addition, Wi-Fi 6 access points will be able to divide each signal between multiple recipient devices, servicing all of them with a single transmis- sion.
Because the LTCC manufactur-
ing process is extremely precise, Jo- hanson Technology is able to guaran- tee the IPC will pass its RF perform- ance requirements with FCC and ETSI and any other emission regula- tion.
“The IPC is basically a plug-
and-play solution,” explains Car- mona. “By working with the leading chipset manufacturers, we have al- ready completed the research and de- velopment to ensure that it’s opti- mized for that specific chip. Not only will it work, but it will comply with the new emission requirements for
Wi-Fi 6E.” Contact: Johanson Dielectrics,
4001 Calle Tecate, Camarilla, CA 93012 % 805-389-1166 E-mail: antenna@johansondi-
electrics.com Web:
www.johansondielectrics.com r
September, 2020
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