Antennas, Coaxial, Connectors and Mounting brackets
Elsema offers a wide range of antennas, expertly designed by our RF engineers using cutting-edge technology and advanced test equipment from Rohde & Schwarz.
Antennas for license-free bands
Antennas for license-free bands like 433MHz, 4G, LTE, 915MHz, and 151MHz are essential for a wide range of wireless applications, including remote controls, long-distance RF control, industrial automation, and smart home systems. These bands provide flexibility by allowing deployment without costly frequency licenses, making them suitable for both personal and commercial uses. Each band serves different purposes: for example, 433MHz is popular for short-range, low-data-rate communications, while 915MHz can handle more robust data transmission over longer distances, ideal for long-distance RF control. 4G and LTE bands, on the other hand, support high-speed data connectivity for data-heavy applications. Elsema, a leading manufacturer of antennas, designs high-quality models tailored to these frequencies, ensuring reliable performance through minimal signal loss, extended range, and consistent data transfer. Selecting the right antenna involves considering factors like gain, SWR, and impedance to best match specific equipment and operating conditions.
Precaution to take when installing and testing antennas
- Do not install it next to metal objects like downpipes.
- Do not coil extra coaxial cable as a loop.
- The ideal position is as high as possible and away from any metal objects.
- To test if the antenna is working you will need a SWR meter or Network Analyser. Do not use a volt meter as this will give incorrect results.
- Always use 50 ohms coaxial cable like RG58. Do not use 75 ohms (RG59) or any other impendence with our antennas unless it is specifically designed for that impendence. Using the wrong coaxial cable will reduce the communications range.
- Use an SWR meter to measure the SWR value in the installation position. This should be done before mounting. This allows you to easily change the position which can improve the SWR. SWR should be less than 1.5 :1. Move the it away from metal objects.