Part #: 1085-109

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Omni Antenna, 2.1 - 2.5 GHz, 2.1 dBi, Embedded Band Pass Filter and LNA
  • Elevation Pattern: Referenced to +20 dBi
  • Engineering Drawing: Dimensions are in inches
  • Filter Response Plot

Product Overview

Southwest Antennas Part #1085-109 is an omni-directional half-wave dipole antenna that features 2.1 dBi of passive antenna element gain, and is designed specifically for receive-only applications.

The embedded LNA and bandpass filter module help reject out-of-band or high power jamming signals from co-located transmitters for better receiver performance. The total peak system gain of 18.3 dBi does not extend the range of the antenna but will help attached receivers with very lower powered signals. 

This antenna is designed for receive-only applications in the 2.1 - 2.5 GHz S-Band and is ideal for federal DHS/DOJ licensed radio applications, while also offering excellent performance in the 2.4 GHz ISM band.

Features: 
  • Receive-Only Antenna
  • Broad Band Coverage
  • 2.1 - 2.5 GHz
  • 18.3 dBi Peak System Gain (antenna, LNA and filter module)
    • 18.3 dBi @ 2.1 GHz
    • 17.7 dBi @ 2.3 GHz
    • 16.7 dBi @ 2.5 GHz
  • Embedded 4-Pole Ceramic Band Pass Filter
  • Embedded LNA​
  • DC Powered on connector center pin:
    • 50 mA @ 3.0 - 5.25 VDC
  • Rugged Construction
  • Low Glare Black Finish
  • Unsealed Spring Base
  • Black Chrome TNC(m) RF Connector

Antenna Specifications

Parameter Value Units Tolerance
Antenna Pattern Omni Antenna
Frequency Band S
Impedance 50 Ohms
Minimum Frequency 2.1 / 2,100 GHz / MHz
Maximum Frequency 2.5 / 2,500 GHz / MHz
Frequency Bandwidth 0.4 / 400 GHz / MHz
Maximum VSWR 2:1 Ratio
Maximum Gain 2.1 dBi Passive Antenna Element Only
Polarization Vertical
Horizontal (AZ) Beamwidth 360 Degrees
Vertical (EL) Beamwidth 69 Degrees Center Band (53 Degrees Min, 72 Degrees Max)
Ground Plane Required No
Radome Material G10 Fiberglass
Color Black
Spring or Gooseneck Spring
Spring Length 0.750 / 19.050 inches / mm
Spring Diameter 0.750 / 19.050 inches / mm
Maximum Wind Velocity 100 / 161 mph / kph
RF Connector Type TNC(m)
RF Connector Features Black Chrome Rotating RF Connector
Product Height 9.000 / 228.600 inches / mm ±0.13"
Product Diameter 0.812 / 20.625 inches / mm +0.02" / -.000"

LNA Specifications

Parameter Value Units Tolerance
LNA Impedance 50 Ohms
LNA Min Frequency 2.1 / 2,100 GHz / MHz
LNA Max Frequency 2.5 / 2,500 GHz / MHz
LNA Gain 20 dB
LNA NF .4 dB
Output P1dB 20 dBm
Output IP3 35 dBm
LNA DC Voltage Range 4.2 V Min 3.0V, Max 5.25V

Filter Specifications

Parameter Value Units Tolerance
Filter Type 4mm, 4-pole Ceramic bandpass filter
Fo 2.3 / 2,300 GHz / MHz
Insertion Loss <1.0 dBa
Return Loss 15 dB
Rejection 3 -42 dBc Min @ 1500 MHz