Band Pass Filter COFDM Spiral filter
BPF Band Pass Filter RF band-pass cavity filter COFDM Spiral filter frequency customized vcan1884
A band-pass filter is a device that allows waves of a specific frequency band to pass while blocking other frequency bands.
A band-pass filter refers to a filter that can pass frequency components in a certain frequency range, but attenuates frequency components in other ranges to a very low level, as opposed to the concept of a band-stop filter.
جدول المحتويات
سمات
تخصيص
Each Helical filter Spiral filter (bandpass filter) is customized according to needs, and the size of different working frequency bands is different.
| غرض | معامل |
| تكرر | 830-870ميجاهيرتز |
| Insertion loss | ≤1.2db |
| Return loss | ≥16db |
| Out-of-band rejection | ≥60dB@760MHz
≥60dB@940MHz |
| موصل | سما-ك |
| وزن | 0.15كلغ |
| الأبعاد | 89 * 32 * 20مم |
600-620Mhz BandPass Filter
| تكرر | 600~620 ميجا هرتز |
| فقدان الإدراج | ≤1.2db |
| In-Band Fluctuation | ≤0.3db |
| VSWR | ≥1.3 |
| Out-Of-Band Suppression | ≥40dB@f0±40MHz |
| Withstand Power | 20W |
| موصل | سما-ك |
| الأبعاد | 89 X 32 X 20mm |
| وزن | 90 جرام |
806-826Mhz BandPass Filter
| تكرر | 806~826MHz |
| فقدان الإدراج | ≤1.2db |
| In-Band Fluctuation | ≤0.5db |
| VSWR | ≥1.3 |
| Out-Of-Band Suppression | ≥40dB@DC~755MHz
≥40dB@875~2000MHz |
| Withstand Power | 20W |
| موصل | سما-ك |
| الأبعاد | 89 X 32 X 20mm |
| وزن | 90 جرام |
857~863Mhz BandPass Filter (860Mhz center)
| تكرر | 857~863MHz |
| فقدان الإدراج | ≤1.2db |
| In-Band Fluctuation | ≤0.4db |
| Standing Wave Ratio | ≥1.3 |
| Out-Of-Band Suppression | ≥40dB@FO±20MHz |
| Withstand Power | 100-واط |
| موصل | SMA-50K or N-50K optional |
| الأبعاد | 152 س 57 x 30mm |
| وزن | 90 جرام |
| درجة حرارة | -35~+65°C |
428-438Mhz 433Mhz BandPass Filter
| تكرر | 428~838MHz (433Mhz+/-5Mhz) |
| فقدان الإدراج | ≤2db |
| In-Band Fluctuation | ≤0.5db |
| VSWR | ≥1.4 |
| Out-Of-Band Suppression | ≥40dB@405MHz
≥40dB@461MHz |
| Withstand Power | 20W |
| موصل | SMA-50K |
| الأبعاد | 89 X 32 X 20mm |
| وزن | 90 جرام |
1427.9-1447.9Mhz BandPass Filter
| تكرر | 1427.9~1447.9 ميجا هرتز |
| فقدان الإدراج | ≤1.0db |
| In-Band Fluctuation | ≤0.5db |
| VSWR | ≥1.3 |
| Out-Of-Band Suppression | ≥40dB@DC~1360MHz
≥40dB@1570~2000MHz |
| Withstand Power | 20W |
| موصل | سما-ك |
| الأبعاد | 60 X 50 X 16mm |
| وزن | 70 جرام |
|
606-614MHz Cavity filter test record |
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| عينة |
Insertion loss ≤1.2db |
VSWR≤1.4 |
In-band fluctuation ≤0.6db |
Out-of-band suppression ≥40db@590MHz |
Out-of-band suppression ≥40db@630MHz |
| No.1 | 1.05 | 1.2 | 0.4 | 53 | 56 |
| No.2 | 1.01 | 1.2 | 0.4 | 51 | 52 |
|
428-438MHz Helical Filter Test Record |
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| عينة |
Insertion loss ≤1.3db |
Return loss≥15db |
In-band fluctuation ≤0.6db |
Out-of-band rejection ≥40db@383MHz |
Out-of-band suppression ≥40db@483MHz |
| No.1 | 1.13 | 19 | 0.4 | 43 | 44 |
| No.2 | 1.05 | 20 | 0.4 | 44 | 45 |
الأسئلة الشائعة
For the helical bandpass filter (BPF) to meet the blue line in the picture, the length of the bandpass filter needs to be increased from 89mm to more than 110mm, and the insertion loss may increase by about 1.
- The minimum bandwidth can only be about 3MHz.
- The performance index of 2MHz is very poor and not ideal.
- The volume size is around 199*120*31mm.
- The CNC machining is very complicated and the cost is higher. The price is RMB 1,600 yuan. (USD220)
Tips you should know when you order
What is the frequency range?
What is the insertion loss requirement?
Suppress 820-851 ميجاهيرتز,How many DBs are required
The passband is 866-870Mhz.
تحميل
BPF Band Pass Filter Specification PDF
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A COFDM-based high-speed wireless image transmission transmitter is proposed for UAV aerial photography and wireless video surveillance, مشتمل: a baseband coding and modulation module, which is used to receive the input image data stream and convert it into a baseband modulation signal with a specific spectrum; a radio frequency A module for up-converting the baseband modulation signal to a set frequency; wherein, the baseband coding modulation module includes: baseband framing, frame scrambling, BCH coding, LDPC coding, bit interleaving, constellation mapping, constellation rotation, Time interleaving, time frame mapping, frequency interleaving, pilot insertion, IFFT transformation, فاصل الحراسة, spectrum shaping; the radio frequency module includes: digital-to-analog converter (DAC), voltage-controlled oscillator (VCO), up-converter (Modulator ), مرشح تمرير النطاق (BPF), power amplification (السلطة الفلسطينية); using the COFDM-based high-speed wireless image transmission transmitter, the video data transmission rate can be significantly improved in high-speed mobile environments such as drone aerial photography, Meet the requirements of high-definition and ultra-high-definition image transmission.
التعليقات
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