Passive Shelter Antenna Set for Emergency Communication in Protected Facilities
The Passive Shelter Antenna Set is a passive communication solution designed to help maintain radio and mobile-network connectivity in civil defence shelters, underground or hardened facilities, and other structures where concrete walls, metal construction or surrounding ground can make signal transmission difficult.
According to the published product information, the system is designed to receive and reproduce radio and mobile-phone signals between the outside environment and the shelter without connection to an electrical power source. SHELTER
Passive communication without an external power supply
The principal feature of the system is its passive operating principle. The product description states that the antenna does not require an electrical power source and can therefore operate when the electrical grid is unavailable. SHELTER
The system is intended to transfer signals between an external antenna and an antenna located inside the protected facility. The published set includes:
internal antenna;
external antenna;
30 m connecting cable with connector. SHELTER
The antenna system therefore provides a physical signal path between the outside and inside of the protected structure without requiring an active powered repeater.
Application in shelters and hardened facilities
The product is specifically described for use in civil defence shelters, underground/hardened facilities and other environments where signals may have difficulty passing through walls, metal structures or surrounding ground. SHELTER
Maintaining communication in such environments can be important for receiving information and communicating with external services. The product description specifically identifies applications including communication with rescue authorities, sending emergency messages and receiving instructions. SHELTER
The antenna should therefore be considered a communication component for a protected facility rather than an independent radio or mobile communication device.
Internal antenna
The internal antenna is identified as model VSS-5G-SAS-1-SMAN.
The published technical documentation specifies the following characteristics:
Parameter | Specification |
Frequency range | 698–960 / 1710–2700 / 3400–3800 MHz |
Gain | >6 dBi / >9 dBi / 6 dBi |
VSWR | ≤2.0 |
Polarization | Vertical |
Horizontal beamwidth | 65° |
Vertical beamwidth | 55° |
Input impedance | 50 Ω |
Maximum power | 100 W |
Lightning protection | DC Ground |
Connector | SMA-Female, 1 m cable |
Mounting | Wall mount |
Dimensions | 165 × 155 × 50 mm |
Weight | 0.3 kg |
Reflector material | Copper |
Radome material | ABS |
Radome colour | White |
Relative humidity | Up to 100% |
Operating temperature | −40°C to +60°C |
These specifications are provided in the published technical documentation for the VSS-5G-SAS-1-SMAN antenna. Odit Construction Company
External antenna
The external antenna is identified as model VSS-5G-UAY-1-NN.
Its published specifications include:
Parameter | Specification |
Frequency range | 698–960 / 1710–2700 / 3400–3800 MHz |
Gain | 4 dBi / 4 dBi / 3 dBi |
VSWR | ≤2.0 |
Polarization | Vertical |
Horizontal beamwidth | 360° |
Vertical beamwidth | 60° |
Input impedance | 50 Ω |
Maximum power | 50 W |
Lightning protection | DC Ground |
Connector | N-Female, 1 m cable |
Mounting | Mast mount |
Dimensions | 190 × 66 × 66 mm |
Weight | 0.37 kg |
Reflector material | Brass |
Radome material | UV-ABS |
Radome colour | White |
Maximum wind speed | 216 km/h |
Operating temperature | −40°C to +60°C |
These specifications are documented for the VSS-5G-UAY-1-NN external antenna. Laatuantenni
Frequency coverage
Both antenna components are specified for the following frequency ranges:
698–960 MHz1710–2700 MHz3400–3800 MHz
This range covers the frequency bands specified for the antenna system, including portions of cellular and 5G frequency ranges. The technical documentation should be used when determining compatibility with a particular operator or communication system. Laatuantenni
The Finnish antenna catalogue also presents the two antenna models together as a passive shelter solution, with the external omnidirectional antenna connected to the internal panel antenna through the cable. Kesko Onninen
Omnidirectional external antenna
The external VSS-5G-UAY-1-NN antenna has a specified 360° horizontal beamwidth. This means the published antenna specification describes horizontal omnidirectional coverage.
The internal VSS-5G-SAS-1-SMAN antenna is a directional panel antenna with a specified 65° horizontal and 55° vertical beamwidth. Laatuantenni
The different antenna characteristics correspond to their respective positions in the system: an external antenna receives/transmits signals outside the protected structure, while the internal panel antenna provides the indoor interface.
No electrical power required
One of the main characteristics of the Passive Shelter Antenna Set is that it does not require an electrical power supply. The product page specifically states that the system can work when the power grid is unavailable. SHELTER
This differentiates a passive antenna system from an active signal repeater that requires electrical power for amplification.
The passive system itself does not generate or amplify a signal. Its function is based on the antenna and cable arrangement connecting the external and internal environments.
Testing and certification
The product information states that the antennas have undergone various tests and have certification for use in civil defence shelters in Finland. SHELTER
The published description also states that the equipment has undergone testing including a vibration test representing vibration caused by an outdoor explosion transmitted through the concrete structure of a shelter to equipment attached to that structure. SHELTER
The stated purpose of these tests is to verify that civil-protection equipment can function during crisis conditions.
System configuration
The complete Passive Shelter Antenna Set consists of:
External antenna → 30 m connecting cable → internal antenna
The product page specifies that the set includes the internal and external antennas together with a 30 m cable and connector. SHELTER
The technical documentation also notes that the specification for the VSS-5G-SAS-1-SMAN document describes the indoor antenna and that an external antenna and connecting cable are required for operation of the system. Odit Construction Company
Main technical characteristics
Specification | Passive Shelter Antenna Set |
System type | Passive shelter antenna / repeater |
Internal antenna | VSS-5G-SAS-1-SMAN |
External antenna | VSS-5G-UAY-1-NN |
Frequency range | 698–960 / 1710–2700 / 3400–3800 MHz |
Internal antenna gain | >6 / >9 / 6 dBi |
External antenna gain | 4 / 4 / 3 dBi |
Internal antenna impedance | 50 Ω |
External antenna impedance | 50 Ω |
Internal antenna maximum power | 100 W |
External antenna maximum power | 50 W |
Cable included | 30 m |
Power supply required | No |
Price shown | €855 excluding sales tax |
The product page currently lists the Passive Shelter Antenna Set at €855 excluding sales tax. SHELTER
Conclusion
The Passive Shelter Antenna Set is a passive communication solution designed for protected environments where conventional radio and mobile signals may be attenuated by concrete, metal structures or surrounding ground.
The system consists of an internal panel antenna, external antenna and 30 m connecting cable and operates without an electrical power source. Its published frequency range is 698–960 / 1710–2700 / 3400–3800 MHz, with separate technical characteristics for the internal and external antennas. SHELTER
The published product information also states that the equipment has been tested and approved for civil defence shelters in Finland, including vibration testing relevant to equipment installed on shelter structures. SHELTER
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