I. Product Features and Description

    The primary function of the Balun filter is to perform balanced-to-unbalanced conversion, suppress spurious signals, enhance the system's anti-interference capability, filter out unwanted signals, and allow useful signals to pass through with low loss. As a three-port device (one unbalanced input port and two balanced output ports), the Balun filter can distribute the signal from the unbalanced input port to the two balanced output ports, ensuring that the signals at the output ports have the same amplitude and a phase difference of 180°. The Balun filter can also be used as a balanced-unbalanced converter.

    The Balun filter offers advantages such as low insertion loss, multiple impedance conversions, high out-of-band suppression, and a wide frequency band. In the manufacturing process, LTCC wiring technology is employed to reduce the size of the Balun filter. Additionally, the use of a dielectric material with a low dielectric constant (9.8) enables dimensions as small as 1.6*0.8*0.6mm. Within the frequency range of 1.85GHz to 2.695GHz, the insertion loss is less than 1.5dB, and the phase imbalance is less than ±10°. This fully meets the requirements for miniaturization in modern communication equipment, making it an indispensable microwave component connecting transmitters and receivers.

II. Product Models and Parameters

III. Precautions and Applications

    The Balun filter can be widely used in antenna modules, mixers, phase shifters, Bluetooth, WiFi, wireless local area networks, and connections between RF front-end transmitters and receivers. During use, ensure that the grounding terminal is properly grounded, as poor grounding may affect out-of-band suppression and flatness indicators. The soldering temperature should not be too high, and the duration should not be too long. It is recommended to use the recommended temperature. Wave soldering is not suitable. The product should be stored in a warehouse with an ambient temperature of -10°C to 40°C, relative humidity not exceeding 80%, and free from acidic, alkaline, or other harmful gases. For cleaning, it is recommended to use alcohol for wiping.

    Xianfeng Microwave can customize LTCC Balun filters. These products are highly customized, and once manufactured, they cannot be altered. Before ordering, clearly specify the parameter requirements for the device. For parameter requirements beyond the physical limits of the material, negotiations can be conducted between both parties. These products are highly customized, and once manufactured, they cannot be changed.