433MHZ Black Rubber Spiral Spring Antenna

KSh 120.00

In stock

Description
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433MHz black rubber spiral spring antenna is a type of compact, helical antenna designed for wireless communication in the 433 MHz band. This type of antenna is widely used in small, portable devices such as remote controls, wireless sensors, and IoT devices. The “spiral spring” design, often called a helical antenna, allows a relatively long wire to be coiled into a small, space-saving form factor, which is especially beneficial for embedded or internal antenna applications. The black rubber casing provides durability and protection from physical damage and environmental factors.
Description
* Design: The antenna consists of a coiled wire element (the “spring”) encased in a flexible black rubber or plastic material. This helical shape is a form of a shortened monopole antenna, where the coiled structure electrically lengthens the antenna while maintaining a compact physical size.
* Purpose: It is designed to be soldered directly to a PCB (Printed Circuit Board) of a wireless module. The black rubber casing ensures the antenna is robust and can withstand some handling and use in various conditions.
* Radiation Pattern: These are typically omnidirectional antennas, meaning they can transmit and receive signals in all horizontal directions, making them a good choice for applications where the orientation of the devices is not fixed.
Specifications
* Frequency Range: 433 MHz, often with a small tolerance, e.g., 433 ± 5 MHz.
* Gain: Typically around 2-3 dBi (decibels isotropic), which indicates a decent level of signal amplification for a compact antenna.
* Input Impedance: The standard impedance is 50 Ω (ohms), which is a common value for most RF systems and ensures good power transfer.
* VSWR (Voltage Standing Wave Ratio): A measure of how efficiently radio frequency power is transmitted. A typical VSWR is ≤ 2.0 or even ≤ 1.5 at the center frequency, indicating good impedance matching.
* Polarization: The antenna usually has vertical polarization.
* Connector: Designed for direct soldering to the PCB, without an external connector like SMA.
* Length: The physical length can vary, but typical sizes are in the range of 20mm to 40mm.
* Material: The internal element is usually copper wire, and the casing is a durable rubber or plastic.