Perimeter security

Microwave barriers

Microwave barriers are an effective perimeter protection that detects unauthorized persons, especially when the fence is missing or it is not possible to install fence detectors.

Perfect protection of open areas

The safest solution is the correlation of microwave barriers that complement the perimeter fencing and other systems supporting effective protection of the outdoor area, e.g. analyst in thermal or white light imaging cameras.

Microwave barriers of the BM series of the Italian company AVS Electronics are recognized around the world and used in critical infrastructure facilities, i.e. military units, nuclear power plants, airports, refineries, prisons, etc., as well as in the private sector, i.e. warehouses, factories, parking lots, residences and others.


The BM barrier system consists of 2 units – 1 transmitter (TX) and 1 receiver (RX) – installed at a maximum distance of 60, 120 or 200 meters. The transmitter emits microwaves continuously towards the receiver. The intruder, at the moment of violating the zone monitored by microwaves, reduces the signal received by the receiver until the appropriate level is reached and an alarm is generated. Perimeter protection is achieved by installing multiple barriers on one site.

Key features

More safety

The safety zone is a wide and high strip, it cannot be passed without generating an alarm. This provides greater security compared to other technologies.

Lower number of false alarms

Setting the detection sensitivity to pets is easy: the alarm level is programmed to ignore small animals and generate fewer false positives. BM barriers distinguish a true violation of the zone from a disqualifying factor (e.g. a car parked between the barriers).

Common interface and installation

The BM posts are only 120 cm high: they are easy and quick to install, thanks to which the assembly cost is lower compared to other technologies. The barrier is also easy to set up (several trimmers and dip-switches). Thanks to regular NC outputs, the BM barriers cooperate with all intrusion detection and CCTV systems.

Planar microwave antenna

Since 2003, the BM barriers have planar antennas with a 20% reduced area of ​​sensitivity compared to previous parabolic antennas. BM barriers can be installed on longer circuits, which allows for significant savings. In addition, to protect against rain, parabolic antennas use large, extensive, hard-to-handle waterproof housings, while flat BM planar antennas are weather-protected by placing them in a highly durable protective housing that prevents condensation and subsequent corrosion.

Working environment

BM barriers work in all weather conditions (snow, rain, fog) without the distance reduction effect, unlike active infrared barriers. If the temperature drops below -5 ° C, it is possible to install the TERM1 heating kit. The operating temperature range of the BM is -40 / + 60 ° C.

Power supply

The BM M and BM HP barriers are supplied with 13.8 V DC. The VAC series is directly powered by the main grid (230 V AC) and includes an optional backup battery to ensure power supply in the event of mains power failure. 230V power supply simplifies wiring and reduces installation costs.


All barriers have valid certificates used in the territory of the Republic of Poland, including compliance with the Defense Standard NO-04-A004: 2016. Microwave barriers are compliant with Grade 3 and Environmental Class IV according to PN-EN-50-131.

Advantages of digital avs barriers

Automatic gain control (AGC)

Fluctuations in environmental parameters can sometimes improve or worsen the reception of the microwave level. AGC automatically optimizes this level to keep it constant.

Reduction of the sensitivity area

Barriers can digitally reduce the sensitive area by up to 30%, and then ignore the movement of peripheral objects (e.g. from fences or trees), which are the source of unwanted alarms.

False alarm filter

BM HP barriers automatically record up to 3600 events, with the possibility of classification as correct and false alarms. BM HP verify then new events against this database and stop false alarms.

Digital interface

In addition to the NC outputs and other standard settings, the BM HP has a USB and RS485 port for connection to an RS485 hub or AVS control panel.


Via a local USB port or remotely via PSTN, GSM or IP, the HPWIN software shows all parameters, the oscilloscope, 3600 most recent alarm events (with date and time) and provides all the tools for setting barriers.