What are FM Antennas?
FM antenna refers to the antenna that transmits and receives wireless signals with frequency modulation. The English name is FM antenna, and Chinese is also called FM antenna.
FM antenna
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- Chinese name
- FM antenna
- Foreign name
- FM antenna
- nickname
- FM antenna
- working frequency
- Mhz segment
- Antenna type
- External type, built-in type
- FM antenna refers to the antenna that transmits and receives wireless signals with frequency modulation. The English name is FM antenna, and Chinese is also called FM antenna.
- The operating frequency is in the Mhz segment. The civilian frequency bands are:
- Radio 76Mhz-108Mhz;
- Terminals using this antenna include radios, radio handsets, card speakers, RFID equipment, wireless headphones, remote controls, and more.
- First: external type
- A: Metal telescopic whip antenna (divided into omnidirectional type and one-dimensional 180-degree type)
- B: Spiral antenna
- C: Flexible type, such as headphone cable, etc.
- Generally used in radio and analog TV mobile phones, a large number of mobile phones use the headset cable as a radio antenna.
- Second: Built-in type
- A: LTCC ceramic craft production
- B: Circuit board production
- C: Coil production
- D: Magnetic antenna (used in mobile phones, card speakers, mini speakers, digital photo frames and other terminals, which need anti-metal. Anti-body effect design)
- Developed two generations of products:
- The first generation was the winding of enameled wires on magnetic materials. Not resistant to high and low temperature, the product appearance is not beautiful.
- The second-generation product is pinned, and the product is resistant to high temperatures.
- E: LDS antenna
- An external antenna works best because of its large size and high gain. However, installation and use are inconvenient.
- The built-in type has a lot of gain reduction. It needs to be designed on the bandwidth so that the efficiency reaches 80% of the external antenna.
- The circuit board type is a flat installation, but the pre-design requires a lot of plate making, and the cycle is long.
- The coil type has a high Q value and a narrow bandwidth, but only resonates at a few frequencies. There are windings loaded with plastic sheets, which lowers the Q value and the bandwidth is not wide.
- The magnetic antenna has the widest bandwidth, and the human effect of holding and not holding it is eliminated, which is suitable for use in card speakers and mobile phones.
- LDS process antenna is the latest manufacturing technology, which is used to laser-laser metal lines on organic materials. It is mainly used for antenna manufacturing. Domestically known as stereo
- One development trend of circuits and three-dimensional circuits is laser laser on magnetic materials. This technology combines magnetic antenna and LDS process characteristics. Future intelligence
- Mobile phone technology direction. Weihang brand laser plastic began to be used in this field in batches.
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