Stacking with Power Splitters
The basis of the power splitters/combiners is a construction of a square tube for the outer conductor and a round tube for the inner conductor. It forms a quarterwave coaxial impedance transformer. The relation D/d influences the resistance/impedance of the splitter. As with the stacking by coax-cables the impedance transformation will be made with lengths of λ/4. A halvewave-splitter consists of two quarterwave-splitters in parallel. Very good tool to construct power splitters is the program “AppCad” .The program is freeware, download it at. www.hp.woodshot.com
E = Z02/ ZA
Z = Z0 (see AppCad)
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| Type 1a: A quarterwave power splitter (2-way) | Type 2a: A halfwave power splitter (2-way) |
| Type 1b: A 4-way splitter, right are 4 connectors | Type 2b: A 4-way splitter, each side have 2 connectors |
Attributes of the Power Splitters.
| Type | Ways | Length | ZE | ZA | Z0 |
| 1a | 2x | λ/4 | 25Ω | 50Ω | 35,4Ω |
| 1b | 4x | λ/4 | 12,5Ω | 50Ω | 25Ω |
| 2a | 2x | λ/2 | 50Ω | 100Ω | 70,7Ω |
| 2b | 4x | λ/2 | 25Ω | 100Ω | 50Ω |
Lengths of the inner Tubes (d) for the Bands 2m, 70cm and 23cm.
| Amateurband | Principle | Length inner tube |
| 2m | λ/4 | 520mm |
| 70cm | λ/4 | 166mm (RFHamdesign) |
| 70cm | λ/4 | 173mm |
| 23cm | 3λ/4 | 189mm |
λ/4 Splitter, 2-way, Type 1a, needed Z=35,4Ω RFHamdesign Copper.
| Type | Square | Inner (D) | Round Tube (d) | Z |
| 1a | 25x1mm | 23mm | 14mm | 35,4Ω |
λ/4 Splitter, 2-way, Type 1a, needed Z=35,4Ω.
| Type | Square | Inner (D) | Round Tube (d) | Z |
| 1a | 29,5×2,8mm | 24,7mm | 15mm | 34,4Ω |
| 1a | 23,5×1,5mm | 20,5mm | 12mm | 36,6Ω |
| 1a | 19,5×1,5mm | 16,5mm | 10mm | 34,6Ω |
| 1a | 30x2mm | 26mm | 15mm | 37,5Ω |
Table 2: λ/4 Splitter, 4-way, Type 1b, needed Z=25,0Ω.
| Type | Square | Inner (D) | Round Tube (d) | Z |
| 1b | 25x2mm | 21mm | 15mm | 24,7Ω |
| 1b | 19,5×1,5mm | 16,5mm | 12mm | 23,7Ω |
Table 3: λ/2-Splitter, 2-way, Type 2a, needed Z=70,7Ω.
| Type | Square | Inner (D) | Round Tube (d) | Z |
| 2a | 29,5×2,8mm | 24,7mm | 8mm | 72,1Ω |
Table 4: λ/2-Splitter, 2-way, Type 2b, needed Z=50Ω.
| Type | Square | Inner (D) | Round Tube (d) | Z |
| 2b | 30x2mm | 26mm | 12mm | 50,9Ω |
| 2b | 25x2mm | 21mm | 10mm | 49Ω |
Table 4: λ/4-Splitter, 3-way, Type 1c, needed Z=28,3Ω.
| Typ | Square | Inner (D) | Round Tube (d) | Z |
| 1c | 35x2mm | 31mm | 10mm | 30,8Ω |
Detailed picture of the inside.