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Std edition Balun for dipole and folder dipole antenna
No Profile
License: Public Domain
Description
**Balun is an electrical device that converts between a balanced signal and an unbalanced signal**
- to match the dipole (impedance 73 Ohm) using a transformer 1:1.5 - 73/1.5 = 48.7 Ohm;
- to match the folder dipole (impedance 292 Ohm) using a transformer 1:1.5 - 292/1.5 = 194.7 Ohm and transformer 1:0.25 - 194.7*0.25 = 48.7 Ohm.
**Examples:**
- for Cable pressure connector;
- for Cable soldering connector.
**Specifications:**
- Dipole antenna frequency range 0.5...550 MHz;
- Folder Dipole antenna frequency range 2...550 MHz;
- RF cable: RG5, RG6, 5D-FB, LMR300;
- Power: less or equal 0.25 W;
- Feed line: 50 Ohm (Designed with PCB Toolkit V7.11);
- Used PCB Material: FR-4;
- PCB thickness: 1.6 mm.
**Accessories:**
- TC1.5-52TX+ 1:1.5 CORE & WIRE Transformer, 0.5...550 MHz, 50 Ω, 0.25 W: [Mini-Circuits TC1.5-52TX+](https://www.minicircuits.com/WebStore/dashboard.html?model=TC1.5-52TX%2B);
- TC4-11X+ 1:0.25 CORE & WIRE Transformer, 2 - 1100 MHz, 50 Ω, 0.25 W: [Mini-Circuits TC4-11X+](https://www.minicircuits.com/WebStore/dashboard.html?model=TC4-11X%2B).
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | Dipole connector | D31,D12,D22,D21,D11,D32,D41,D42 | DIPOLE CONNECTOR | 8 |
| 2 | Cable soldering connector | C4,C2 | CABLE SOLDERING CONNECTOR | 2 |
| 3 | Cable pressure connector | C3,C1 | CABLE PRESSURE CONNECTOR | 2 |
| 4 | TC4-11X+ | T4,T6 | AT1521 | 2 |
| 5 | TC1.5-52TX+ | T3,T1,T2,T5 | AT1521 | 4 |
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