Parasitic element coupling device for smaller WiFi 7 antennas
Murata has developed a Parasitic Element Coupling Device that improves antenna efficiency by magnetically coupling the parasitic element with the antenna.
The Murata Parasitic Element Coupling Device is the world’s first solution designed for WiFi 6E and WiFi 7 products and allows designers of smartphones, tablets, network routers, game consoles, and other compact electronics to build more efficient antennas.
The WiFi 6E and coming WiFi 7 standards use multiple high-performance antennas to improve communication speed and quality. However, as the dimensions of heatsinks and batteries expand, as processors become more advanced, the available space for mounting antennas tends to decrease, driving the need for smaller antennas.
However there is a technical limitation, in that the efficiency of wide-band antennas decreases when they are miniaturised. This means designers need a solution that achieves both miniaturisation and high performance.
The parasitic element coupling device, made with Murata’s multilayer technology as a four-terminal surface-mount component, connects the feeding antenna to its parasitic elements more effectively than is possible through free space. The 1.0 x 0.5 x 0.35mm element acts as a coupling device without the use of magnetic materials, which would be inappropriate at the targeted operating frequencies.
One side of the coupling device is connected, at very low insertion loss, between a device’s RF circuitry and its main antenna. The other side is connected between the ground and the parasitic element. The resultant, more direct coupling enables the resonance characteristics of the parasitic element to be added to those of the feeding antenna. As a result, it enables more efficient operation across a broader frequency range or on multiple discrete bands.
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The device helps to combat that when an antenna is made smaller, the coupling between it and the parasitic elements is reduced, while the coupling between the parasitic elements and the ground is increased. By sustaining the coupling between the feeding antenna and parasitic element, parasitic element coupling device enables designers to use miniaturised antenna design methods without impacting the communication band of efficiency.
The feeding antenna in a WiFi 7 design can cause an impedance mismatch when used over a wide band, leading to a degradation in wireless performance. In addition, when an antenna with a mismatched impedance is connected to a communication circuit using a long cable, the long cable can promote the impedance mismatch, causing larger insertion loss than expected and significantly reducing wireless communication performance. Using the device can improve antenna matching and reduce performance degradation in wireless communications even when using long cables.
www.murata.com/en-eu/products/antenna/parasitic-element-coupling-device
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