Antenna Module

Multi-band RF Antennas and a Stronger Signal

SimtoLink antenna modules cover 4G/LTE, NB-IoT, LoRa, GPS/BeiDou, and other bands. They use standard RF interfaces such as SMA and IPEX (U.FL), with a typical gain of 2～5 dBi. They improve the RF signal and the coverage of industrial gateways, DTUs, and data collectors.

The radiator and the impedance match are designed together, so a typical VSWR (voltage standing wave ratio) is better than 1.5. That puts more power into the air and cuts reflection loss. SimtoLink antennas ship with IoT terminals to ease weak signal, dropouts, and slow GNSS convergence on site. Exact figures follow the ordered model and the Hardware Specification.

VSWR<1.5Typical VSWR

2～5 dBiTypical gain

Multi-bandCellular / LPWAN / GNSS

IP54 and upOutdoor models

Specifications and Band Coverage

SimtoLink antennas are offered by band and by the job they serve. The table is a typical reference. For a bid or for acceptance, use the Hardware Specification shipped with the goods.

Band	Frequency	Gain	Typical use
4G/LTE	698～2700 MHz (typical cellular)	2～5 dBi	Industrial gateways, DTUs, vehicle terminals
NB-IoT	B5/B8 and others	2～3 dBi	Smart metering, environmental monitoring
LoRa	433 / 470 / 868 / 915 MHz	2～5 dBi	LoRa gateways, long-range links
GPS/BeiDou	1575 / 1561 MHz and others	2～4 dBi	Positioning terminals, in-vehicle navigation

Both omnidirectional and directional antennas are available, with suction-cup, magnetic, and threaded mounts. Outdoor models emphasize weather resistance and sealing. Lightning protection and feeder parts can be recommended per project. Model pages in this directory are listed further down.

Where External Antennas Are Used

An external antenna is a usual fix in the RF path: filling a weak spot inside a cabinet, extending LoRa coverage, holding a vehicle link in a poor area, or shortening GNSS time to first fix. Results vary with the site and the radio:

Stronger Signal Inside a Gateway Cabinet

A metal cabinet attenuates the cellular field. Bringing a 4G/LTE antenna outside the cabinet can raise RSSI and cut dropouts. The feeder and the ground have to be designed with it.

Wider LoRa Gateway Coverage

Within the allowed transmit power, more gain or a higher mount can extend line-of-sight coverage. Count the gateway RF port and the cable loss in the same link budget.

Vehicle Links in Weak Areas

An external omnidirectional antenna, or a shark-fin combination, can steady the attach at a tunnel mouth or in an underground garage. It still depends on operator coverage.

GNSS on Positioning Terminals

An active ceramic antenna, or an external GNSS antenna, raises carrier-to-noise ratio and shortens cold-start time for vehicles and asset tracking.

Selection and Installation

Match the band: Cellular, NB-IoT, LoRa, and GNSS do not share one operating frequency. An unapproved wideband “universal antenna” is not a substitute for a band-specific design.
Match the connector: Confirm SMA, IPEX/U.FL, and polarity. If you need a pigtail, keep the extra loss small.
Gain and the rules: The transmit path has to meet local radio rules and the device approval for EIRP and duty cycle.
Where it sits: Keep it clear of heavy blockage and of other transmitters, and watch for pattern distortion from nearby metal.
Feeder length: A high band and a long feeder add insertion loss quickly. Use a lower-loss cable when the run is long.

Install and Keep It Working

Select the antenna and check it on site in this order:

Confirm the band→ Choose the connector→ Gain and the site→ Mount and ground→ Check VSWR and field strength

Tighten connectors to the specified torque. Outdoors, seal against water and bond the lightning-protection earth to the same potential. SimtoLink can supply a selection table, installation notes, and a technical contact for volume projects.

Ordering, Documentation, and Support

SimtoLink supplies the datasheet, dimensions, the interface definition, a sample BOM, and notes for on-site tuning. Volume orders can include a sample review. Warranty follows the contract and the documents shipped with the antenna.

Related Antenna Models

Detail pages in this directory, in product-line order: