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SMA 433MHz Folding Antenna (Inner Needle)

Description
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SMA 433MHz folding antenna (inner needle) is a type of antenna commonly used for wireless communication in the 433 MHz band. This frequency is popular for a variety of applications, including remote controls, garage door openers, wireless weather stations, and various Internet of Things (IoT) devices.
Description
* Folding Design: The “folding” aspect of the antenna refers to its ability to be bent or articulated, often at a 90-degree angle. This feature is particularly useful for installations where space is limited or where the antenna needs to be adjusted for optimal signal reception or transmission. It also makes the antenna more compact for storage and transportation.
* SMA Connector: The antenna uses an SMA (SubMiniature version A) connector. The “inner needle” (or male pin) refers to the center conductor of the connector, which is a small pin that fits into a corresponding hole on the device’s connector. The “SMA male” connector is characterized by its threads on the inside and a pin in the center.
* Omnidirectional: This antenna is typically omnidirectional, meaning it can send and receive signals equally well in all horizontal directions (360 degrees). This makes it a good choice for applications where the orientation of the communicating devices is not fixed.
* Material: The antenna is often made of a flexible, durable rubber or plastic material that houses the internal radiating element, protecting it from physical damage and the elements.
Specifications
* Frequency Range: The antenna is designed to operate within the 433 MHz frequency band, but its effective range is often a bit wider, for example, 400 MHz to 490 MHz.
* Gain: The gain is a measure of the antenna’s ability to direct radio frequency energy. These antennas typically have a gain of 3dBi (decibels isotropic) or sometimes slightly higher, which indicates a good level of signal amplification for its size.
* Standing Wave Ratio (VSWR): A good antenna will have a low VSWR, which is a measure of how efficiently radio frequency power is transmitted from the source to the antenna. A typical VSWR for this type of antenna is ≤ 2.0 or even ≤ 1.5 at its center frequency, indicating good impedance matching.
* Impedance: The standard impedance is 50 Ω (ohms), which is a common value for most RF systems.
* Polarization: The antenna usually has vertical polarization, which is the most common type for omnidirectional antennas.
* Length: The physical length of the antenna can vary, but a common length for the rod is around 11 cm.
* Connector Type: As the name suggests, it has an SMA Male connector with an inner pin/needle.