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The Importance of Antennas To Wireless Communication Modules
Source:Original | Author:Calio Huang of C&T RF Antennas Inc | Publish time: 2019-12-19 | 659 Views | Share:

The importance of antennas to wireless communication modules--C&T RF Antennas Inc

The communication distance of the wireless module is an important indicator. How to maximize effective communication distance has always been a question for customers. Based on debugging experience, this article makes some explanations on the selection and use of antennas, hoping to help engineers quickly debug the communication distance.

The primary parameter that affects the communication distance of the wireless module is the transmission power. The transmission power of the wireless module and the corresponding ideal transmission distance can be found in the manual. After determining that the transmission power meets the requirements, then consider the selection of the antenna and the antenna Directionality.

The first is the selection of the antenna:

The main indicators of the antenna include the following: frequency range, standing wave ratio SWR or VSWR, antenna gain, polarization mode, and impedance. The frequency range is selected as required; the standing wave ratio is preferably less than 1.5; the antenna gain also affects the transmission distance; the polarization method is divided into linear polarization and circular polarization; the impedance needs to match the output impedance of the wireless module, which is generally 50 ohms. Pay special attention to the VSWR parameters here. It is best to test the SWR with a network analyzer after purchasing the antenna.

When VSWR = 1.5, the theoretical transmission power is 96%. When VSWR = 2, the transmission power is only 88.9%. Some antenna standing wave ratio indicators are less than 2. When using antennas, it is best to have a standing wave ratio of less than 1.5. Higher transmission power.

The second is the directivity of the antenna:

Antennas are directional, which means that antennas have different radiating or receiving capabilities in different directions in space. Antenna directivity is usually measured using a pattern.

When the antenna is placed vertically, the deepest red direction is the direction where the antenna has the strongest radiation or receiving capability. Therefore, when installing the antenna, install the antenna in the direction pointed by red as much as possible to ensure sufficient signal quality. In addition, the metal flat plate has a shielding effect on the signal, so there should be no metal plane in the direction of transmission and reception.