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Dual-band is the working frequency band in ISM2.4G and ISM5G, and the basic application is not dual-frequency at the same time; for ISM5G frequency band, there is a difference between IEEE 802.11a and IEEE 802.11ac standards, and the single-channel band of 11ac standard can reach up to 433Mbps, and 11a. The single channel is still at 150 Mbps. It can be said that the 11a standard has only better anti-interference ability with respect to the ISM 2.4G band, and 11ac is able to resist interference while having a wider bandwidth, and the advantage is more obvious.
Since it is a dual-band WiFi module, it is divided into two major categories from the dual-frequency perspective when it is selected, which is in accordance with the IEEE 802.11a/b/g/n standard and the IEEE 802.11a/b/g/n/ac standard. .
Frequency range: ISM2.4G (2.400GHz to 2.497GHz) and ISM5G (4.900GHz to 5.845GHz);
From the WiFi communication link to distinguish between 1T1R, 2T2R, 3T3R, 4T4R;
From the communication interface to distinguish between USB, PCIe (single WiFi dual frequency currently no SDIO interface);
The following analysis will be combined with the specific chip scheme:
1: Single WiFi function dual-band WiFi module conforming to IEEE 802.11a/b/g/n standard (single channel bandwidth 150Mbps):
1.1: USB interface dual channel program: RTL8192DU/RT5572/AR1021X, which size package with a strong compatibility of 27 * 18mm/LGA-12; which AR1021X has a more extensive size package, while there are high power 2.4G and 5.8 G version, application selection is very flexible;
1.2: PCIe interface dual channel solution: AR9280, is a standard size package 51*30mm/PCIe-52, there is a high-power version for 5.8G;
2: Single-WiFi function dual-band WiFi module conforming to IEEE 802.11a/b/g/n/ac standard (single channel bandwidth 433Mbps):
2.1.1: USB interface single-channel scheme: MT7610UN/RTL8811AU/RTL8811CU, where size package is mainly compatible with 27*18mm/LGA-9;
2.1.2: USB interface dual-channel scheme: MT7612UN/RTL8812AU/RLT8812BU, where size package is mainly compatible with 27*18mm/LGA-12;
2.2.1: PCIe interface dual-channel solution: QCA9888/QCA9882/QCA9892 is a standard-size package 51*30mm/PCIe-52, in which the QCA9882 and QCA9892 also have a high-power version;
2.2.2: PCIe interface three-channel scheme: QCA9880/QCA9890, which is a standard-size package 51*30mm/PCIe-52, and a high-power version;
2.2.3: PCIe Interface Four-Channel Scheme: QCA9984,
The dual-band WiFi module is mainly used for applications with large bandwidth, especially in the field of large-capacity video transmission.
Through the following list, it will be clearer!
The next issue will discuss WiFi module type three: Bluetooth WiFi combo-one WiFi module
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