The principle of active ceramic antennas: The principle of active ceramic antennas mainly involves multiple aspects such as signal reception, amplification, and processing, as follows:
Signal reception principle.
Dielectric resonance: Active ceramic antennas utilize the unique dielectric properties of ceramic materials to form dielectric resonators.
When external electromagnetic wave signals are transmitted, the ceramic medium will resonate at a specific frequency, just like a "resonator box" with a specific frequency, which can generate a strong response to the electromagnetic waves of a specific frequency and thus effectively receive the signals of the corresponding frequency.
Electromagnetic induction: The receiving antenna, through an "antenna" electrode, induces the electromagnetic waves coming from the air into an electric field, generating a high-frequency signal voltage.
This process is similar to the movement of a generator's coil in a magnetic field to generate current. Under the influence of the electric field of electromagnetic waves, the antenna electrodes produce electrical signals that can be processed by subsequent circuits.
Principle of signal amplification.
The function of the low-noise amplifier (LNA) : Active ceramic antennas usually have a built-in low-noise amplifier.
The received signal is often very weak, mixed with a large amount of noise.
Low-noise amplifiers can amplify the received weak signals with as little noise as possible, enhance the signal strength, and maintain a low noise level at the same time, thereby improving the signal-to-noise ratio.
For example, in satellite communication, the signal from the satellite is already very weak when it reaches the ground antenna. A low-noise amplifier can amplify these weak signals to a level that can be effectively processed by subsequent circuits.
Compensation loss: During the signal transmission process, whether it is the dielectric loss of the antenna itself, the conductor loss, or the loss generated when the signal is transmitted over long distances through cables, all will weaken the signal strength.
The active antenna, through its built-in amplifier, can compensate for these losses to ensure that the signal maintains sufficient strength during transmission.
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