Technical specifications and structure of the 470MHz antenna!

　　The 470MHz antenna is a wireless communication antenna designed specifically for the ultra-high frequency (UHF) 470MHz band. It is widely used in the Internet of Things (such as smart water meters and remote monitoring), intercom systems, LoRa modules, and industrial wireless data transmission. Features include vertical polarization, omnidirectional radiation, or directional high gain (for example, fiberglass antennas can achieve gains of 4.5-7dBi, support 50Ω impedance, and a standing wave ratio (SWR) typically ≤1.5-2.0). Common types include fiberglass antennas, suction cup antennas (such as the KH808-5 with a magnetic design), PCB built-in antennas (such as FPC antennas), which are compact, and spring antennas (such as the TCTH4702) with 25% efficiency, adapting to different scenarios, such as outdoor long-distance communication or device integration.

　　I. Working Principle of 470MHz Antennas

　　A 470MHz antenna is a device designed to receive and transmit electromagnetic waves in the 470MHz frequency band. Its core function is based on the reflection, refraction, and transmission of electromagnetic waves. This frequency band lies between VHF (ultra-high frequency) and UHF (ultra-short wave) and offers a medium transmission range (typically covering several to tens of kilometers) and strong penetration, making it particularly suitable for urban areas. Urban environments and mixed indoor and outdoor scenarios.

　　II. Main Technical Parameters

　　The performance of 470MHz antennas varies depending on the specific model and design. The following are typical parameter ranges and technical details:

　　Frequency Range: Typically covers 470-860MHz, with some products supporting narrower bandwidths (such as 433-510MHz) to meet different application requirements.

　　Gain: Gain ranges from 2.5-10dBi, with high-gain models (such as fiberglass antennas) reaching up to 6dBi, suitable for long-distance communications; low-gain designs (such as PCB antennas) prioritize miniaturization and cost control.

　　Standing Wave Ratio (VSWR): Generally ≤1.5-2.0. A low VSWR indicates good matching between the antenna and the transmission line, reducing signal reflection loss.

　　Polarization: Mostly vertical polarization, ensuring stable vertical signal transmission, suitable for terrestrial communications. Scenarios.

　　Power Capacity: Typically 10-50W. High-power models (such as industrial-grade fiberglass antennas) support 50W input and are suitable for base stations or remote monitoring equipment.

　　Mechanical Parameters: Dimensions: 90-150mm for rubber-stick antennas, up to 1250mm for fiberglass antennas.

　　Weather Resistance: Operating temperature range -40°C to +70°C, wind resistance up to 60m/s, some products feature a waterproof design.

　　Connectors: Commonly used are F-type, SMA, and N-type interfaces. Some suction cup antennas support flexible mounting methods such as magnetic attachment and adhesive.

　　The performance of a 470MHz antenna is closely related to its material and structure. Common designs include:

　　Fiberglass Antenna:

　　Material: Fiberglass shell + all-copper vibrator, balancing lightweight and corrosion resistance.

　　Structure: Built-in RF coaxial cable directly connected to the N-type connector, maintaining linear signal transmission through the vibrator base. , with a reflective surface accuracy of ≤0.6mm, ensuring high gain.

　　Suction Cup Antenna:

　　The base contains a magnet and grounding metal, allowing for vehicle-mounted or temporary installation. The cable can be made of low-loss coaxial cables such as RG178, with custom lengths ranging from 5 to 50cm.

　　Anti-collision treatment and an all-copper cable design enhance flexibility and durability.

　　PCB Antenna:

　　Using a printed circuit board (PCB) microstrip design, measuring only 73×17×0.2mm, it is suitable for embedded devices (such as smart home sensors).

　　It is low-cost and easy to mass-produce, but has low power handling (typically ≤10W).

　　Spring Antenna:

　　Mainly made of phosphor copper or nickel-plated copper, its spiral structure achieves omnidirectional radiation and is commonly found in portable devices (such as wireless remote controls).

　　The frequency characteristics are precisely controlled by adjusting the coil length and diameter, supporting multi-band adaptation from 315MHz to 2.4GHz.