Walsin antenna and RF filter band coverage is lopsided. We tested 34 antennas against 138 band pass and balanced filters: 7 antennas have a band that no filter’s published band contains. All 6 sub-GHz antennas are among them, while 94 filters contain the 2.4 GHz band.
Venatech Limited, an authorised Walsin distributor in Hong Kong, holds two exports from Walsin Technology (Walsin) that nobody joins: the antenna file and the RF function files. This post joins them on frequency. It is written from the Working Frequency Range column of Walsin_Antenna_ALL.xlsx and the frequency columns of the RF files, and from nothing else. We hold no datasheet for any antenna or RF part, so every band is a figure the export states, not one we have checked. Every part number is real.
How many Walsin antennas have a band that no band pass filter contains?
Seven of 34, or 20.6 percent. We converted every antenna band to megahertz and tested it against the published Frequency interval of all 138 band pass and balanced filters in Walsin_Filter.xlsx: a filter counts only if its interval contains the whole antenna band. The 34 are the 36 radiating antennas minus 2 whose only band is the unreadable 5.x GHz. The two induction coils, 13.56 MHz and 100 KHz, and the six cables and connectors are excluded.
| Antenna part | Band as published | Band pass or balanced filters containing it | Best overlap with any one filter | Low-pass filters containing it | Match / mismatch |
|---|---|---|---|---|---|
RFDPA131000SBUB802 |
433MHz |
0 | none | 10 | Mismatch — no band pass part and no overlap |
RFDPA191300SMBB801 |
840~868 MHz |
0 | none (0 of 28 MHz) | 34 | Mismatch — the 869 to 894 filter starts 1 MHz above the antenna band |
RFMTA010504NNRB002 |
863~928 MHz |
0 | 25 of 65 MHz | 24 | Mismatch — covers 38 percent of the antenna band |
RFMTA060206NNBB002 |
880~960 MHz |
0 | 35 of 80 MHz | 24 | Mismatch — covers 44 percent |
RFDPA660900SMTB801 |
700±50 MHz, read as 650 to 750 |
0 | 25 of 100 MHz | 14 | Mismatch — covers 25 percent |
RFDPA131012IMTB301 |
850/1900/2100 MHz |
0 at 850 and 2100, 2 at 1900 | none at 850 | 34 at 850 | Mismatch on two of three bands |
RGFRA9937380A3T |
2.4~2.55 GHz |
0 | 100 of 150 MHz | 17 | Mismatch — every 2.4 GHz filter stops at 2500 MHz |
The other 27 antennas pass the test. We have not seen this counted anywhere.
Why is the sub-GHz side so thin when 2.4 GHz is so deep?
Because the filter file is a 2.4 GHz catalogue with a few exceptions. We counted 138 band pass and balanced filters; 94 of them, 68.1 percent, publish a band that contains 2400 to 2500 MHz. Below 1000 MHz there are 4 band pass parts, and the antenna file holds 6 sub-GHz antennas. Of those 4, none contains any of the 6, and 3 of the 6 antenna bands overlap none of them.
| Band group | Antennas | Band pass or balanced filters containing the band | Example antenna | Match / mismatch |
|---|---|---|---|---|
| 2.4 GHz | 25 | 94 | RFANT3216120A1T |
Match — the deepest shelf in either file |
| 5 GHz, 4.9 to 5.9 and 5.15 to 5.85 | 6 | 9 and 18 | RFANT6050110L0T |
Match with a choice of bands |
| GNSS, about 1559 to 1609 | 3 | 5, 6 and 6 | RFFPA401410IMGB301 |
Match on 1125 to 1675, mismatch at the GNSS filter’s edge |
| Sub-GHz, 433 to 960 | 6 | 0 | RFMTA010504NNRB002 |
Mismatch — 4 filters exist and none contains |
| 2.4 to 2.55 GHz | 1 | 0 | RGFRA9937380A3T |
Mismatch — 50 MHz above every 2.4 GHz filter |
The four sub-GHz band pass parts are RFBPF3225200Y0T and RFBPF3225200Y07B1U at 475 to 675 MHz, RFBPF1109B501T at 869 to 894 MHz, and RFBPF1109B801T at 925 to 960 MHz. 25 antennas carry a 2.4 GHz band, 73.5 percent of the 34. Antenna demand and filter depth sit on the same shelf, and the rest of the spectrum is where a design runs out of options.
Where do antenna and filter band edges miss by a few megahertz?
At the GNSS antenna and at the 2.4 to 2.55 GHz chip. The first miss is small and the second is 50 MHz. We measured each edge against the closest filter: RFFPA401410IMGB301 is published at 1559 to 1609 MHz and the one filter tagged GPS/GNSS in Application, RFBPF1411070E0T, is published at 1558 to 1606 MHz, 3 MHz short at the top.
| Antenna part | Antenna band | Closest band pass part | Its band | Shortfall | Match / mismatch |
|---|---|---|---|---|---|
RFFPA401410IMGB301 |
1559 to 1609 MHz | RFBPF1411070E0T |
1558 to 1606 MHz | 3 MHz at the top | Mismatch by 3 MHz; 5 wider filters at 1125 to 1675 contain it |
RFDPA141300SMGB701 |
1565 to 1606 MHz | RFBPF1411070E0T |
1558 to 1606 MHz | none | Match — contained |
RGFRA9937380A3T |
2400 to 2550 MHz | RBBPF1005040A1T |
2400 to 2500 MHz | 50 MHz at the top | Mismatch — RFBPF2520100W0T starts at 2490 and cannot cover the bottom |
RFMTA010504NNRB002 |
863 to 928 MHz | RFBPF1109B501T |
869 to 894 MHz | 6 MHz below, 34 MHz above | Mismatch on both edges |
Read the export for what it states. We do not know whether a published filter band is a pass band, a design band or a marketing band, because we hold no datasheet. A 3 MHz gap may be nothing. A 50 MHz gap is not.
What do low-pass filters, baluns and multiplexers add at sub-GHz?
More parts, and none of them is a band pass filter. Take the 863 to 928 MHz antenna. We counted 24 low-pass filters, 8 baluns and 21 multiplexers whose published bands contain it. The 21 multiplexers are diplexers and triplexers with a low-band leg that runs from between 570 and 704 MHz up to 960 MHz. The 24 low-pass filters include parts published from 5 MHz or from DC, which contain almost any sub-GHz band.
That is why we did not count them as coverage. A low-pass filter whose published band starts at DC contains 433 MHz, 13.56 MHz and 100 KHz alike, and says nothing about whether it suits an antenna at any of them. A diplexer is a two-path part, not a filter in front of an antenna. A balun changes the port type. For the shelf depth of those functions see Walsin RF baluns, filters, couplers and multiplexers.
At 433 MHz the position is starker still: RFDPA131000SBUB802 has 10 low-pass parts that contain it, 0 band pass, 0 baluns and 0 multiplexers. It is the only radiating antenna in the file with no selective RF part in a published band, and the export does not say why.
How should you pair a Walsin antenna and a filter from this data?
Join on numbers, not text, and score overlap rather than presence. Convert every antenna band to megahertz first; the antenna frequency column holds 22 strings in 3 units. Then compute the overlap between the antenna band and each filter band, and rank by the fraction of the antenna band covered.
Three rules follow from the counts. For 2.4 GHz, pick from 94 and decide on case size and insertion loss. For 5 GHz and GNSS, check the edges to the megahertz. For anything below 1 GHz, assume the export gives you a starting point, not an answer, and ask. Our free cross-reference tool lists what differs from your original rather than hiding it behind a tick, and the RF range lists all 457 parts.
We checked the 1,125 part numbers in the ready-stock snapshot dated 23 September 2026 against all 501 RF and antenna part numbers: none appears, so these are enquiry items. See ready stock for what is held. We hold 28 Walsin datasheets, 451 pages, and none covers antennas or RF, so qualification stays with you.
The short version
Walsin’s filter file and antenna file agree at 2.4 GHz and 5 GHz, and thin out everywhere else. Of 34 antennas with a readable band, 7 have a band no band pass or balanced filter contains. All 6 sub-GHz antennas are among them: the file holds 4 sub-GHz band pass parts, RFBPF3225200Y0T, RFBPF3225200Y07B1U, RFBPF1109B501T and RFBPF1109B801T, and none contains any of the 6. Best overlap is 25 to 44 percent, and three antenna bands overlap nothing. At 2.4 GHz, 94 of 138 filters contain the band. RGFRA9937380A3T runs 50 MHz above all of them. We will not tell you a filter fits an antenna. We will show you where the bands differ. Confirm against both datasheets and qualify in your own circuit.
Send us the antenna you have chosen and we will list the filters whose published band overlaps it, with the edges shown. And a question back: if you picked your antenna first, did you check what filter band it left you?
Frequently asked questions
How many Walsin antennas have no band pass filter covering their band?
Seven of 34 antennas with a readable band have at least one band that no band pass or balanced filter contains. All six sub-GHz antennas are among them, plus a 2.4 to 2.55 gigahertz chip antenna. We tested containment of the whole antenna band against the published frequency interval of 138 filters.
How many sub-GHz band pass filters does Walsin list?
Four of 138 band pass and balanced filters publish a band below 1000 megahertz. Two cover 475 to 675 megahertz, one covers 869 to 894 and one covers 925 to 960. None contains any of the six sub-GHz antenna bands, and three of those six overlap none of the four.
How deep is the 2.4 GHz shelf compared with the rest?
Ninety-four of the 138 band pass and balanced filters, 68.1 percent, publish a band containing 2400 to 2500 megahertz, and 25 of 34 antennas carry a 2.4 gigahertz band. The 5 gigahertz groups hold 9 and 18 filters, GNSS holds 5 or 6, and the sub-gigahertz group holds none.
Is there a GNSS filter that covers the whole GNSS antenna band?
One filter is tagged GPS or GNSS in the export, RFBPF1411070E0T at 1558 to 1606 megahertz. It contains the 1565 to 1606 megahertz antenna but falls 3 megahertz short of the 1559 to 1609 megahertz one. Five wider filters at 1125 to 1675 megahertz contain both. We hold no datasheet, so confirm the edges.
Why did you not count low-pass filters as coverage?
Because a low-pass filter published from DC or from 5 megahertz contains almost any low band, including 433 megahertz, 13.56 megahertz and 100 kilohertz, and that says nothing about suitability. Counting them would show every sub-gigahertz antenna as covered. We list the low-pass counts beside the band pass counts so you can see both.
Are the Walsin antennas and RF filters in the ready-stock list?
Not as at 23 September 2026. We checked all 501 RF and antenna part numbers against the 1,125 part numbers in the snapshot and none appears. These lines are available on enquiry, and the snapshot is a dated list, not a live feed. Send us your part numbers and we will tell you what we can supply.