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A signal jammer's shielding capabilities are directly related to its designed frequency band and power, and it can cover a wide range of wireless communication signals. The following are common targets and technical details:

Core communication signals

Full-band coverage for mobile communications: Mainstream signal jammers can simultaneously interfere with 2G to 5G signals, specifically covering the following:

2G: GSM 900/1800MHz (China Mobile/China Unicom), CDMA 800MHz (China Telecom).

3G: WCDMA (2100MHz), CDMA2000 (800MHz), TD-SCDMA (2000MHz).

4G: LTE bands such as B3 (1800MHz), B5 (850MHz), and B41 (2500MHz).

5G: Primarily targets sub-6GHz bands, such as n1 (2100MHz), n41 (2500MHz), and n78 (3500MHz), but has limited effectiveness against millimeter waves (above 24GHz). For example, the TopSignalJammer 5G jammer can simultaneously jam all bands from 2G to 5G, with an effective range of up to 15 meters.

Satellite Communications and Navigation Signals

Satellite Phones: Cover the L-band (1525-1660MHz) and can interfere with maritime satellites, Iridium phones, and other satellites.

GPS/Beidou: Transmits jamming signals in the 1575.42MHz band, disrupting vehicle positioning or mobile phone navigation functions.

Short-Range Wireless Signals

Wi-Fi: Covers 2.4GHz (2400-2485MHz) and 5GHz (5150-5350MHz, 5725-5825MHz). Some devices support selective blocking of specific channels.

Bluetooth: Interferes with the 2.4GHz ISM band, causing device pairing failures or connection loss.

Drone Signals: Requires simultaneous blocking of 2.4GHz remote control and 5.8GHz image transmission signals, such as the TopSignalJammer "Anti-Drone Strong" model.

II. Signal Shielding for Special Scenarios

Professional Equipment and Industrial Signals

Walkie-Talkies: Target the UHF (400-470MHz) and VHF (136-174MHz) bands, commonly found in prisons, construction sites, and other locations.

RFID Tags: Support the 860-960MHz band to prevent false triggering of product security tags or to limit asset tracking.

Wireless Remote Controls: Cover common frequency bands such as 315MHz and 433MHz, capable of interfering with devices like garage doors and electric curtains.

Security-Sensitive Areas

Military and Confidential Locations: In addition to conventional signals, this device can also block drone image transmission signals in specialized frequency bands such as 1.2GHz and 1.4GHz.

Exams and conference rooms: Some devices support customized shielding, for example, blocking mobile phone signals while retaining specific Wi-Fi channels for use by teaching equipment.

III. Technical Limitations and Environmental Impacts

Frequency Band Limitations

Due to the extremely short wavelength of millimeter-wave 5G (above 24 GHz), current mainstream jammers have limited interference effectiveness.

Directional jammers require antenna angle adjustment (with an error of ≤15°) to accurately cover a specific area.

Physical Environment Attenuation

Concrete walls significantly reduce signal penetration. Field measurements show that a jammer with a 20-meter coverage range in an open environment may reduce its coverage to 5 meters behind two walls.

Metal obstacles reflect interfering signals, creating blind spots in the shielded area.

Anti-Interference Technical Challenges

Frequency-hopping communications (such as some encrypted walkie-talkies) and spread spectrum technology may reduce shielding effectiveness, requiring the use of high-power equipment or multi-band combinations.

IV. Future Technology Trends

With the advancement of 6G research and development, some manufacturers have launched jammers that support multi-band coverage. For example, the equipment used by Ningbo Dazhan can simultaneously jam 2G to 6G signals and features intelligent recognition capabilities, automatically determining whether specific signals need to be blocked. These devices utilize optimized RF circuit design and electromagnetic shielding materials to ensure information security while minimizing the impact on legitimate communications.