Car Radio Antenna Newest 2022
3 year ago
Yetnorson Antenna Co., Ltd.
8 year
Product details
In view of the high-frequency demand for long-distance communication in the North American market, yanuoxun Technology adopts the design of 36-37 cm λ/2 golden ratio, and realizes 5 km open and stable communication in the 409-410MHz frequency band. Through impedance matching optimization technology, the standing wave ratio (VSWR) is controlled within 1.2, which is especially suitable for cross-regional dispatching scenes such as field rescue and oil field operation, and the signal penetration ability is improved by 40% compared with similar products.
Innovate the application of vertical polarization technology to control the signal attenuation in the scene of buildings within 20dB. Through the design of multi-element array, the receiving sensitivity of the Walkie Talkie Antenna to 90 incident signal is improved by 15dB, which solves the problem of communication blind area between high-rise buildings in cities. It has become the standard scheme of the security system of commercial buildings in the United States, and the measured buildings across 10 floors still maintain clear voice interaction.
Using the patented spiral loading technology (patent number: ZL202XXXXXXX), the standard electrical length of 36 cm is compressed to the physical size of 12 cm, and the equivalent resonance is realized through the compensation of 0.8μH inductance. The design has been certified by FCC, and the communication distance reaches 2.5 kilometers in the state of 12 cm, which is 60% higher than that of the traditional mini Shark Antenna. It has become the mainstream integration scheme for handheld walkie-talkies and wearable devices.
In addition to the core walkie-talkie antenna, yanuoxun builds a multi-product matrix: the Car Radio Antenna integrates AM/FM dual-band matching circuit (VSWR<1.5) to adapt to the vehicle communication scene; Rubber antenna adopts silicone rubber wrapped with copper core, with IP67 protection level; The GPS ceramic antenna achieves a gain of ≥28dB and a positioning accuracy of ≤5 meters; The magnetic base antenna supports emergency rapid deployment through strong magnetic adsorption design.
1. How to choose the best antenna length for FM radio?
FM radio works in 87-108MHz band, and its antenna length should match the corresponding wavelength. In the vehicle-mounted scene, the 1.66m λ/2 external rod antenna is the optimal solution, which can directly resonate with 90MHz electromagnetic waves, receive signals 50 kilometers away in the open environment, and has strong anti-interference ability. For portable radios, the 83cm λ/4 rod antenna is more suitable, but the resonant circuit needs to be formed by the fuselage metal structure or external ground plane. When stretched to 80-90cm, it can stably receive radio signals within 20km in urban environment.
2.why is the walkie-talkie antenna often designed to be 36-37 cm?
Civil walkie-talkies use 409-410MHz frequency band, and the corresponding wavelength is about 73-74cm, and 36-37cm is the ideal length of λ/2. Under this length, the impedance matching between the antenna and the signal source reaches the best state. The actual measurement shows that the antenna can achieve 3-5 kilometers of stable communication in the open area, and the signal attenuation is only 20dB after penetrating a concrete wall, which can meet the daily use needs of property, security and other scenes.
3. What will happen if the walkie-talkie antenna is shortened to less than 18 cm?
18 cm is the shortest critical value (λ/4) of 409MHz interphone antenna. If it is shorter than this length, the signal performance will deteriorate sharply. Experimental data show that if the antenna is too short, the ability of signal to penetrate the wall will be reduced by more than 60%, and the communication distance will drop from 3 kilometers to less than 500 meters. At the same time, the standing wave ratio (VSWR) will soar from the ideal 1.2 to 3.5, which will cause more than 50% of the signal energy to be reflected back to the transmitting module, which will not only seriously weaken the communication effect, but also burn out the power amplifier tube due to overheating and affect the service life of the equipment.
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Yetnorson Antenna Co., Ltd.
Audited supplier
8 year
Main Product:
TV Antenna,
GPS Antenna,
GSM Antenna,
4G Antenna,
Wifi Antenna,
RF Cable