Nowadays, in the telecommunications industry, development is progressing toward the deployment of next-generation communication 5G.
The news such as Apple ‘s IPhoneXs series recently launched and Huawei’ s 5 G compatible folding smartphone next spring release forecasts are broadcasting the telecommunications industry.
Currently, it is expected that communication using 4G and high-speed LTE will be the main in technology development in the pre-stage to become full 5G, but communication terminals at this stage are DSDS (Dual Sim Dual Standby)
It is also expected that it will respond to next-generation high-speed communication by switching the communication network depending on the situation.
Currently, we are developing and marketing products for optical communication and RF modules, which are also used in current 4G and LTE communication networks, as the first stage effort towards this next-generation communication standard 5G.

This time we are introducing a high-frequency fundamental mode crystal resonator for a filter.
It is essential for optical line communication and RF module to extract the necessary signal from the clock signal source passed through the filter with narrow passband width in order to reduce noise and take out a sharper signal.
Also, since the frequency used is increased, it is necessary to have a filter of the characteristic located between the filter using the SAW device and the MCF.
However, with the SAW filter, it is difficult to narrow the pass bandwidth, and at present, the MCF is difficult to handle this high frequency.
Therefore, our company offers a high-frequency crystal resonator for Discrete type Monolithic Crystal Filter being developed by many customers.
In general, MCF has stable frequency characteristics with respect to temperature, low loss, high cutoff characteristics, and excellent aging characteristics compared with other filters, and it is effectively used for the narrowband bandpass filter. In addition, by increasing the number of crystals to use (increasing the number of poles), sharpness in the attenuation region increases, making it possible to manufacture narrowband bandpass filters.
In order to manufacture such an excellent MCF, a high frequency and high precision crystal resonator using a fundamental mode are required.
We mainly offer UM-1 high-frequency fundamental crystal resonator for 4 to 6 pole Discrete type Monolithic Crystal Filter. Our UM-1 high-frequency fundamental crystal quartz resonator is inspecting all waveform characteristics in pre-shipment inspection and contributes to Discrete MCF’s Group Delay reduction.

We would like to show you our example Crystal Resonator as follows.

Crystal Resonator for Discrete Monolithic Crystal Filter
Holder	UM-1
Frequency	122.400MHz Band
122.3260MHz +/-13ppm(Fund.)	122.3440MHz +/-13ppm(Fund.)
122.3520MHz +/-13ppm(Fund.)	122.4045MHz +/-13ppm(Fund.)
122.4080MHz +/-13ppm(Fund.)	122.4250MHz +/-13ppm(Fund.)
122.4300MHz +/-13ppm(Fund.)	etc. (Dependent on Customer’s required Frequency)
Load	SERIES
ESR	55Ω max.
Equivalent Inductance	1.7mH to 2.1mH
DLD2	4Ω max.
Temperature Frequency Difference	+/-20ppm max.
Excitation Level	0.1mW
Operating Temperature	-40 to +70deg C
Frequency characteristic curve

For specification details please contact our sales department.
Also, if you inquire about the specifications you want, we will review our technical department, please feel free to contact us.