一、Characteristics

      Dielectric waveguide filter (also known as ceramic waveguide filter, transmission line filter) is a device that uses the shape and size of the waveguide structure to achieve filtering and frequency selection. The principle of ceramic waveguide filter is to use the resonator effect to filter the specific frequency signal. In the high-frequency field, the role of the waveguide filter is to provide excellent filtering performance and reliable signal transmission, so that useful signals pass through to achieve the purpose of separating currents of different frequencies. The main applications of ceramic waveguide filter are signal enhancement, signal frequency selection, signal suppression, signal shape adjustment and signal processing.

     Dielectric waveguide filters have high frequency selectivity (frequency range 700MHZ~1) 5GHz), insertion loss of 0.1 ~ 3dB (varies with bandwidth), strong anti-interference ability, high power resistance, wide operating temperature (-55 ~ +85℃) range, low input and output standing wave (1.3:1), high Q value, small temperature drift, high rectangularity, good remote suppression, good temperature stability, input/output 50Ω (75Ω must be specified) Impedance matching, easy to cascade use; The performance is stable and reliable in the whole temperature range, and it can meet the requirements of military working environment (-55℃ ~ +85℃), etc. The biggest disadvantage of the waveguide filter is that the size is significantly larger than other resonators that can be applied in the microwave segment.

Dielectric waveguide filter

二、Model & Electrical characteristics

三、Application & attention

     Dielectric waveguide filters (also known as ceramic waveguide filters, transmission line filters) are used in communication base stations, Cpes, microwave multiplex systems, microwave and millimeter wave communication systems, radar systems, and other high-frequency narrowband systems. In the high-frequency field, waveguide filters can provide excellent filtering performance and reliable signal transmission. Note that the grounding end is well grounded, otherwise out-of-band suppression and flatness indicators will be affected. Products should be stored in the ambient temperature of -10℃~40℃, relative humidity is not more than 80%, the surrounding environment is not acidic, alkaline and other harmful gases in the warehouse. Do not use wave soldering during welding. If reflow welding is used, the recommended temperature is recommended. Do not soak when cleaning, it is recommended to wipe with alcohol. 

     Dielectric waveguide filter design is flexible and can be customized according to customer requirements. The company has a variety of sizes for users to choose from, can be customized from 1.8GHz - 15GHz ceramic waveguide filter. Because the indicators of microwave components are related to each other and sound to each other, the user needs to clearly state the indicator requirements before customization. This kind of product belongs to the relatively strong customization of the product, the product has been made, it cannot be changed. If there are indicators that exceed the physical limit of the material itself, the best indicators can be achieved through negotiation between the two parties.