Illustration of a compact grey square 4-port antenna clamped to a lamp post above a harbour, four cables running from its base

Manufacturer drawing of the compact square antenna, showing the rear mounting plate

The main picture is illustrative, generated to show how the antenna looks once installed. Alongside it is the manufacturer's own drawing.

TDB-3800-4200XX-12-65

n77 12 dBi 65° sector antenna, 4-port

Name: n77 12 dBi 65° sector antenna, 4-port
Brand: Aerix
SKU: TDB-3800-4200XX-12-65
Price: 175.20 GBP
Availability: BackOrder

Compact 4-port ±45° sector for 3.8–4.2 GHz, 12 dBi, 65° beam, 170 × 172 × 60 mm, for 4×4 MIMO small cells.

3.8–4.2 GHz12 dBi65° × 33°4 × N-female, ±45°

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About this antenna

A compact box, about the size of a hardback book, with four ports: two columns, each cross-polarised at ±45°. It is built for 4T4R small cells, and it is small and light enough (1 kg) to go on a lamp post, a CCTV column or the wall of a building without a planning conversation about visual impact.

Its 33° vertical beam is much wider than the 8° of the long panels, which is the right choice for a low mounting height: users close to the pole, and below it, stay inside the beam. The measurements show 11.1 to 12.6 dBi across all four ports and the band, with a horizontal beamwidth of 56° to 66°.

Where it fits

Lamp posts, CCTV columns and building walls at 3 to 8 metres.
4T4R small cells, or two 2T2R radios sharing one antenna.
Streets, yards and quaysides where the users are close to the pole.

Specification

Electrical

Frequency range	3800–4200 MHz
Gain	12 dBi (11.1 to 12.6 dBi measured)
VSWR	≤ 1.8
Polarisation	±45°, two columns
Port-to-port isolation	≥ 22 dB
Front-to-back ratio	≥ 23 dB
Horizontal beamwidth	65°
Vertical beamwidth	33°
Impedance	50 Ω
Maximum input power	100 W
Lightning protection	DC ground

Mechanical

Connectors	4 × N-female
Dimensions	170 × 172 × 60 mm
Weight	1.0 kg
Radome	UV-stabilised PVC
Operating temperature	−40 °C to +65 °C
Mounting pole	Ø38 to Ø52 mm

Radiation pattern

Horizontal (azimuth)

Vertical (elevation)

Gain: 12.2 dBi
Horizontal beamwidth: 62°
Vertical beamwidth: 27°
Front-to-back: 22 dB

Manufacturer range measurements, October 2023 (Planet MSI files), port 1 (+45°) at 4.0 GHz. Boresight is at the top of each plot and angles are measured from it. Rings are at 0, −10, −20 and −30 dB relative to the peak; the dashed ring marks −3 dB, where beamwidth is measured. The faint traces are the other measured frequencies. Beamwidths and front-to-back ratio are worked out from the measurement data.