Dielectric Filter_Array Type

Dielectric Filter_Array Type

Features

The  Dielectric Filter_Array Type is a kind of microwave filter which USES a dielectric resonator to obtain frequency selection through multistage coupling. After entering the 21st century, the dielectric filter has gradually moved from the laboratory to the production line after long-term accumulation in theory and practice. Due to its advantages of miniaturization, low loss and good temperature characteristics, the dielectric filter has been widely used in mobile communication and microwave communication systems. It is characterized by low insertion loss, good power resistance rate, and narrow band width. It is especially suitable for the level-directional coupling filtering of CT1, CT2, 900MHz, 1.8ghz, 2.4ghz, 5.8ghz, portable phone, car phone, wireless headset, wireless microphone, wireless radio, cordless phone and integrated transmitter-receiver diplexer. With the rapid development of mobile communication, navigation technology and electronic countermeasures, higher requirements have been put forward for the improvement of the size and performance of the existing filters. Insertion loss, out-of-band no stray response, out-of-band suppression, Q value and size are the key parameters of the filter. On the premise of providing higher performance indicators, the reduced size of dielectric filter is urgent issue in this field. Our product has unparalleled advantages, such as the low insertion loss for using high Q-value dielectric resonators,small and light for using high dielectric constant ceramics,excellent mechanical stability without vibratile structure,excellent temperature stability,SMD and reflow soldering available and mountable by automatic placement machine. SMD filter is called because of its package, surface mounted filter, distinguishing from Pin type package. The surface of the dielectric filter is covered with a metal layer with zero tangential electric field. The electromagnetic wave is confined in the medium and forms a standing wave oscillation. Its geometric size is about half of the waveguide wavelength. Generally, ceramics with relative permittivity between 60 and 80 are used. In practice, the size of dielectric ceramic filter used in wireless communication is in the centimeter level.

Application Field

Compared with the empty valley precision vibrator filter, the medium filter can realize miniaturization. In the 1970s, the dielectric filter was used in the field of microwave communication. After the 1980s, with the advent of cellular phones, the dielectric filter was also used in mobile communication systems. Nowadays, as a miniaturized high frequency, dielectric filter is indispensable in microwave and mobile communication. The dielectric filter made of ceramic materials with high dielectric constant (relative dielectric constant greater than 30) has a volume only a fraction of that of the cavity precision oscillator filter. More importantly, with the development of ceramic materials, the resonant frequency of the dielectric filter can be controlled in a small range with the change of temperature. The dielectric filter can be used not only as a bandpass filter in microwave relay lines and mobile communication systems, but also as a clock signal extraction filter for optical communication applications. The application of Dielectric Filter_Array Type is quite wide,such as base station & repeater, PCS system, CDMA system, GSM DCS system, WCDMA system, WLL system, TRS system, TD-SCDMA system. The frequency Range is400~6000MHz.

Specifications