# YouLoop 小环天线介绍 **YouLoop** 是由 Airspy 推出的无源宽频小环天线，专为中波（MW）与短波（SW）频段设计，适用于 SDR（软件定义无线电）接收环境，尤其在城市高噪声环境下表现优越。结构很简单，反相器＋巴伦的方案，项目以最低的成本复刻天线。项目链接直达：https://oshwhub.com/bitshen/youloop-xiao-huan-tian-xian --- ## 🔧 基本参数 | 参数 | 描述 | |--------------|------------------------------------------------| | 类型 | 被动式磁环天线（Passive Magnetic Loop） | | 频率范围 | 约 0.5 MHz – 30 MHz | | 天线结构 | 双环结构（对称耦合） | | 接口 | SMA | | 是否需电源 | 否（完全被动） | | 极化方式 | 安装角度决定水平或垂直极化 | --- ## 🧩 结构与特点 - **双环结构设计**：通过对称耦合结构，有效抑制共模干扰。 - **宽频无调谐**：无需手动调谐，即可覆盖 MW 和 SW 范围。 - **轻巧便携**：适合户外使用或搭建简易监听站。 - **高共模抑制能力**：对城市中的电磁干扰有天然抑制效果。 - **无源设计**：无需电源，适合长期部署与远程监听系统。 --- ## 🛠 使用建议 - 使用同轴电缆连接 SDR，可进一步提升抗干扰能力。 - 尽量远离高频干扰源（如 Wi-Fi、LED 灯、电源适配器等）。 - 可使用 PVC 管、三脚架、窗台等简单结构支撑天线环。 - 建议配合高动态范围接收机（如 Airspy HF+）使用，性能最佳。 - 注意，天线不防水 - 警告：不允许250mW以上发射，若要发射请选用FT140-43等大功率磁环绕制巴伦 --- ## 📦 套件内容 - 两根RG402，单个1米长度，SMA公转SMA公 - 五个 SMA 母座 - TC1-1T贴片巴伦 - PCB电路板 ![image.png](https://image.lceda.cn/oshwhub/pullImage/01c777c012904885829c66bd83795eca.png) ---

@"seekdoor"#p73674 缘分hhh，不用众筹，淘宝上面卖同轴线、巴伦的商家很多，还包邮

Introducing a highly cost-effective shortwave loop antenna – the Youloop Loop Antenna.

5Breeze

YouLoop Small Ring Antenna Introduction

YouLoop It's a broadband small loop antenna, developed by Airspy, specifically designed for the medium wave band.（MW）With shortwave（SW）Frequency band design, suitable for SDR (Software-Defined Radio) receiving environments, particularly performing well in urban high-noise environments. The structure is simple, using an inverter plus a Balun configuration, allowing the project to replicate the antenna at the lowest possible cost.

Direct link to the project:https://oshwhub.com/bitshen/youloop-xiao-huan-tian-xian

🔧 Basic parameters

Parameters	Description
Type	Passive Magnetic Loop Antenna
Frequency range	Approximately 0.5 MHz – 30 MHz
Antenna structure	Dual-ring structure (symmetric coupling)
Interface	SMA
Is power required?	No (completely passive)
Polarization method	The installation angle determines whether the polarization is horizontal or vertical.

🧩 Structure and Features

Double-ring structure design: By using a symmetrically coupled structure, it effectively suppresses common-mode interference.
Wideband, uncalibrated: Covers both MW and SW ranges without manual tuning.
Lightweight and portable: Suitable for outdoor use or setting up a simple listening station.
High common-mode rejection capability: It has a natural effect of suppressing electromagnetic interference in urban environments.
Source-less design: No power required, suitable for long-term deployment and remote listening systems.

🛠 Usage recommendations

Using coaxial cables to connect the SDR can further enhance its interference resistance capabilities.
Try to keep away from sources of high-frequency interference (such as Wi-Fi, LED lights, power adapters, etc.).
The antenna ring can be supported by simple structures such as PVC pipes, tripods, and window sills.
It is recommended to be used in conjunction with a high dynamic range receiver (such as the Airspy HF+) for optimal performance.
Please note that the antenna is not waterproof.
Warning: Transmitting with power exceeding 250 mW is prohibited. If you need to transmit, please use a high-power magnetic loop antenna such as the FT140-43.
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📦 Contents of the kit

Two RG402 cables, each 1 meter long, SMA male to SMA male.
Five SMA female connectors
TC1-1T patch
Printed Circuit Board (PCB)

seekdoor

It's fate, right? Should I try crowdfunding?

5Breeze

seekdoor It's fate! No need for crowdfunding; there are many sellers on Taobao who sell coaxial cables and Baren products, and they offer free shipping.

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