一、Characteristics
The main role of LTCC high-pass filters (also known as LTCC low-cut-off filters or low-temperature co-fired ceramic low-resistance filters) is to remove or attenuate components below a certain frequency from the signal, while allowing components above that frequency to pass through. This filter helps to improve the quality of the signal, enhancing the high frequency part of the signal and suppressing the low frequency part. The LTCC high-pass filter is characterized by allowing frequencies higher than a certain cut frequency to pass, while greatly attenuating lower frequencies, and also removing unnecessary low-frequency components in the signal or removing low-frequency interference components.
The maximum operating temperature of LTCC high-pass filter is -55℃ ~ +125℃, with input/output 50Ω (or 75Ω, it must be specially noted) impedance matching, small standing wave, easy to cascade, easy to integrate, flat in-band frequency characteristics, small insertion loss, high out-of-band inhibition, narrow transition frequency band, flexible design, Light weight, small size, low cost, good thermal stability (in the full temperature range (-55 ° C ~ +85 ° C) stable and reliable performance, cheap price, convenient welding, good consistency, SMD design, etc., can reduce complex adjustment work, thus simplifying circuit design and other advantages.
LTCC high-pass filter
二、Electrical Characteristics
| LTCC high-pass filter (ceramic high-pass filter) model and parameter table |
| Part No | Frequency (MHz) | Insertion loss (dB) | 3dB*Cut-off frequency | V.S.W.R * | Stopband(MHz) | Power (max) |
| HF0440 ~ 3216A | 500 ~ 2500 | ≤ 1.3 @ 600 ~ 1700 MHz | 440 | 1.5*(500 ~ 1700 MHz) | ≥ 40 dB @ 230 | 7 W |
| 2.0* @ 500 ~ 2500 MHz | ≥ 20 dB @ 350 |
| HF0605 ~ 3216A | 710 ~ 2490 | ≤ 1.3 @ 850 ~ 1700 MHz | 650 | 1.5*(760 ~ 1700 MHz) | ≥ 40 dB @ 390 | 7 W |
| 2.0* @ 710 ~ 2490 MHz | ≥ 20 dB @ 480 |
| HF0740 ~ 3216A | 780 ~ 2800 | ≤ 1.3 @ 900 ~ 2200 MHz | 740 | 1.5*(780 ~ 1900 MHz) | ≥ 40 dB @ 430 | 7 W |
| 2.0* @ 780 ~ 2800 MHz | ≥ 20 dB @ 550 |
| HF0880 ~ 3216A | 950 ~ 3200 | ≤ 1.3 @ 900 ~ 2200 MHz | 880 | 1.5*(970 ~ 2400 MHz) | ≥ 40 dB @ 500 | 7 W |
| 2.0* @ 780 ~ 2800 MHz | ≥ 20 dB @ 640 |
| HF1200 ~ 3216A | 1220 ~ 4600 | ≤ 1.3 @ 1380 ~ 4000 MHz | 1180 | 1.5*(1300 ~ 3200 MHz) | ≥ 40 dB @ 750 | 7 W |
| 2.0* @ 1220 ~ 4600 MHz | ≥ 20 dB @ 910 |
| HF1300 ~ 3216A | 1400 ~ 5000 | ≤ 1.3 @ 1510 ~ 4000 MHz | 1300 | 1.5*(1400 ~ 4000 MHz) | ≥ 40 dB @ 690 | 7 W |
| 2.0* @ 1400 ~ 5000 MHz | ≥ 20 dB @ 930 |
| HF1500 ~ 3216A | 1600 ~ 5500 | ≤ 1.3 @ 1850 ~ 4400 MHz | 1550 | 1.5*(1620 ~ 3450 MHz) | ≥ 40 dB @ 230 | 7 W |
| 2.0* @ 1600 ~ 5500 MHz | ≥ 20 dB @ 350 |
| HF1810 ~ 3216A | 1950 ~ 4750 | ≤ 1.3 @ 2250 ~ 3850 MHz | 1810 | 1.5*(2250 ~ 3750 MHz) | ≥ 40 dB @ 1100 | 7 W |
| 2.0* @ 1950 ~ 47500 MHz | ≥ 20 dB @ 1480 |
| HF2700 ~ 3216A | 2650 ~ 6500 | ≤ 1.3 @ 3000 ~ 5700 MHz | 2500 | 1.5*(2900 ~ 5500 MHz) | ≥ 40 dB @ 1500 | 7 W |
| 2.0* @ 2650 ~ 6500 MHz | ≥ 20 dB @ 1800 |
Note: Stopband rejection and standing wave ratio marked with * are typical values值 , Because there are many product models, only some representative models are listed in the table.
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三、Dimensions & PCB welding drawings
四、Application & attention
LTCC high-pass filters are widely used in WLAN, DSTV, Bluetooth, satellite TV, PHS and cordless telephones. When in use, pay attention to the grounding end is well grounded, otherwise it will affect out-of-band suppression and flatness indicators. The welding temperature should not be too high and the welding time should not be too long. If reflow welding is used, the recommended temperature is recommended, and wave soldering is not recommended. 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 soak when cleaning, it is recommended to wipe with alcohol.
The company can customize LTCC high-pass filter, LTCC low-pass filter, LTCC bandpass filter, LTCC band-stop filter, LC band-stop filter and other microwave electronic components. Since LTCC products are highly customized devices, the parameter requirements of the devices should be clearly stated before the order. For the parameter requirements beyond the physical limit of the material, the best indicators can be achieved through negotiation between the two parties.
