For an LTCC RF filter on a Campinas 5G prototype, Walsin Technology (Walsin) lists 457 RF parts, 235 of them filters, including a 1608 low-pass for 3,300 to 3,800 MHz at 0.55 dB insertion loss. Venatech Limited, an authorised Walsin distributor in Hong Kong, crosses and quotes every one.
Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this for RF and prototype engineers in Campinas and São Paulo state, Brazil, who build gateways, user devices and test boards for private 5G and Wi-Fi networks and need small filters for each band. We parsed the seven Walsin RF exports, including FRESH_rf_filter.xlsx (235 parts), FRESH_rf_balun.xlsx (72) and FRESH_rf_multiplexer.xlsx (116), and our ready-stock list as at 23 September 2026. Every part number is real, and the market facts come from one report fetched on 11 November 2026.
What did Unicamp open for 5G and 6G research?
A 5G studio on campus. According to Teletime on 3 December 2025, the State University of Campinas (Unicamp) inaugurated the SMARTNESS Studio 5G, an Ericsson Private 5G network for demonstrating, training and prototyping 5G, edge-computing and AI applications, at the SMARTNESS 2030 research centre backed by Fapesp and Ericsson, with NEC as integrator.
The report gives total SMARTNESS investment of 56 million reais and says the centre aims to become a 5G and 6G innovation hub. Those are the report’s figures, not ours. Our conclusion: a private 5G testbed brings prototype gateways, sensors and modules onto one campus, and every prototype radio needs a filter for each band it uses. We have no relationship with Unicamp, Ericsson or NEC and say nothing about what they buy.
How many RF filters does Walsin list?
235 filters within 457 RF parts. We counted 457 distinct Walsin RF parts across the seven RF .xlsx files: 235 filters, 116 multiplexers, 72 baluns, 17 couplers, 9 antenna switches, 5 BAW and 3 SAW filters; 233 of the 235 filters are LTCC.
By application, the filter file lists 115 for 2.4 GHz Bluetooth, Wi-Fi and Zigbee, 69 for 2G, 3G and 4G telecom, 25 for 5 GHz Wi-Fi, 16 for MoCA and DOCSIS, 4 for IoT and 1 for 5G NR at 3.3 to 3.8 GHz. By type, 112 are band-pass, 94 low-pass, 26 balanced and 3 high-pass. Our guide to reading an RF filter part number by band decodes the codes, and the RF range lists every family.
Which Walsin LTCC RF filters cover a 5G campus gateway’s bands?
One per band, at least. For a gateway that combines a 5G NR radio at 3.3 to 3.8 GHz, an LTE radio at 1.8 GHz and 2.6 GHz, and a 5 GHz Wi-Fi backhaul, we found a Walsin LTCC filter for each band in FRESH_rf_filter.xlsx, with insertion loss from 0.5 dB to 2.1 dB.
The match column is against a 5G NR brief, a 3.3 to 3.8 GHz harmonic low-pass at 1 dB or less; the other rows serve the gateway’s other radios. Your incumbent goes in the last column.
| Walsin part | Type | Size | Band (MHz) | Insertion loss (dB) | Match / mismatch with the 5G NR brief | Your incumbent |
|---|---|---|---|---|---|---|
RFLPF16083G5W7T |
Low-pass | 1608 | 3,300 to 3,800 | 0.55 | Match | |
RFLPF10051G8D3T |
Low-pass | 1005 | 1,710 to 1,910 | 0.5 | Mismatch: LTE 1.8 GHz path | |
RFBPF25202G6W0T |
Band-pass | 2520 | 2,490 to 2,690 | 2.1 | Mismatch: LTE 2.6 GHz path | |
RFLPF16082G5W0T |
Low-pass | 1608 | 2,300 to 2,700 | 0.9 | Mismatch: 2.3 to 2.7 GHz path | |
RFBPF1608060K9T |
Band-pass | 1608 | 5,150 to 5,950 | 0.6 | Mismatch: 5 GHz Wi-Fi path | |
RFLPF1608060Y4T |
Low-pass | 1608 | 698 to 960 | 0.9 | Mismatch: sub-GHz LTE path |
A match is a match on export fields. Rejection at each harmonic, the pin layout and the recommended land pattern are in Walsin’s datasheet, and an LTCC filter must be laid out exactly to it to hit the stated loss.
Why does a 3.5 GHz radio need a low-pass filter at 0.55 dB?
Because every tenth of a decibel after the amplifier is lost transmit power. The Walsin 5G NR part RFLPF16083G5W7T passes 3,300 to 3,800 MHz at 0.55 dB and, in the export, rejects at least 17 dB at 6,600 to 7,600 MHz and 15 dB at 9,900 to 11,400 MHz, the second and third harmonics of the band.
A power amplifier at 3.5 GHz produces harmonics at 7 GHz and 10.5 GHz, which must stay out of other services. A low-pass after the amplifier removes them, and its insertion loss comes straight off output power and battery life. For a Campinas prototype, that makes 0.55 dB in a 1.6 by 0.8 mm body a practical starting point; measure on your own board. Our guide to passives for a telecom base station front end shows the wider chain. Radio approval is your test house’s call; we give no Anatel or regulatory advice.
How does a Campinas lab get Walsin RF filters from Hong Kong?
By quote, through our authorised Walsin channel. Our ready-stock list as at 23 September 2026 centres on MLCC and resistors, so all 457 Walsin RF parts, including RFLPF16083G5W7T, are quoted to order: request a quote and we source them through our authorised Walsin channel in small lots.
That suits a research lab, which needs tens of pieces per band rather than reels. The ready-stock list is a dated snapshot, never live-synced, and it does hold the RF-grade MLCC a matching network needs. We give no stock or lead-time promise.
How can Venatech help a telecom research team in Brazil?
How Venatech helps: cross the RF lines, then quote small lots. Venatech Limited is the authorised Walsin distributor in Hong Kong, and VenaMatch decodes 18 manufacturers’ part numbers and crosses 800,000+ parts to Walsin, marking each field match or mismatch.
Paste up to 500 part numbers into the cross-reference tool, or upload a prototype BOM. We serve small lots from Hong Kong, quote fast and help you check each cross; request a quote through the site. Walsin is the line we are authorised for; Stackpole and Viking are lines we supply. We give no customs or import advice; confirm with your compliance team.
The short version
Unicamp’s 5G studio brings prototype radios to Campinas, and every radio needs a filter per band. Walsin covers that with 457 RF parts and 235 LTCC-based filters, including RFLPF16083G5W7T for 3.3 to 3.8 GHz at 0.55 dB, plus filters for the LTE and Wi-Fi paths of the same gateway.
Send us the bands your prototype uses and the filters on your current BOM, and we will return the Walsin rows with every field marked. Which band in your design still has no harmonic filter?
Related reading
- Reading an RF filter part number by band
- Passives for a telecom base station front end
- Sub-GHz RF filters for remote telemetry
- Free cross-reference tool and ready-stock snapshot
Last reviewed 11 Nov 2026.
Sources
Fetched 11 November 2026.
- Teletime, “Unicamp ganha Studio 5G para acelerar pesquisa em 5G e 6G”, 3 December 2025: https://teletime.com.br/03/12/2025/unicamp-ganha-studio-5g-para-acelerar-pesquisa-em-5g-e-6g/
Frequently asked questions
What 5G facility opened at Unicamp in Campinas?
Teletime reported on 3 December 2025 that Unicamp inaugurated the SMARTNESS Studio 5G, an Ericsson Private 5G network for prototyping, at a research centre backed by Fapesp and Ericsson with NEC as integrator. These are the report’s statements.
How many RF filters does Walsin make?
We counted 235 Walsin filters within 457 RF parts; 233 of the filters are LTCC, and they cover 2.4 GHz, 5 GHz Wi-Fi, 2G to 4G telecom and 5G NR bands.
Which Walsin filter covers 5G NR at 3.3 to 3.8 GHz?
RFLPF16083G5W7T, a 1608 LTCC low-pass with 0.55 dB insertion loss and harmonic rejection listed at 6.6 to 7.6 GHz and 9.9 to 11.4 GHz. Confirm the land pattern against Walsin’s datasheet.
What is an LTCC RF filter?
A filter built from layers of low-temperature co-fired ceramic with printed inductors and capacitors inside, giving a small surface-mount part with stable performance for one band.
Can I buy Walsin RF filters in small quantities for Brazil?
Yes. Venatech Limited, an authorised Walsin distributor in Hong Kong, quotes RF filters to order in small lots. We give no lead-time promise and no import advice.
Does Venatech give radio approval advice?
No. Radio approval belongs to your test house and regulator; confirm with your compliance team.