Log Spiral Antenna 8 dBi Typ. Gain, 1-12 GHz Frequency Range RM-LSA112-8R

Short Description:

RF MISO’s Model RM-LSA112-8R is a right-handed circularly log spiral antenna that operates from 1-12GHz. The antenna offers a gain 8 dBi Typ. and low VSWR <2.5 with SMA-Female connector. It is specifically designed for fields with extremely high requirements for bandwidth and polarization adaptability, such as electronic reconnaissance, EMC testing, and broadband communication.

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Specifications

RM-LSA112-8R
Parameters	Typical		Units
Frequency Range	1-12		GHz
Impedance	50ohms
Gain	8 Typ.		dBi
VSWR	<2.5
Polarization	RH circular
Axial Ratio	2 Typ.		dB
Connector	SMA-Female
Size	Φ180*430		mm
Weight	16.649		Kg
Deviation from omni	±3		dB
1GHz Beamwidth 3dB	E plane: 81.47° H plane: 80.8°
4GHz Beamwidth 3dB	E plane: 64.92° H plane: 72.04°
7GHz Beamwidth 3dB	E plane: 71.67° H plane: 67.5°
11GHz Beamwidth 3dB	E plane: 73.66° H plane: 105.89°
Power Handling	CW:50	Peak:100	W

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The log-spiral antenna is a classic angular antenna whose metal arm boundaries are defined by logarithmic spiral curves. While visually similar to the Archimedean spiral, its unique mathematical structure makes it a true “frequency-independent antenna.”

Its operation relies on its self-complementary structure (metal and air gaps are identical in shape) and its purely angular nature. The antenna’s active region at a specific frequency is a ring-shaped zone with a circumference of approximately one wavelength. As the operating frequency changes, this active region smoothly moves along the spiral arms, but its shape and electrical characteristics remain constant, enabling extremely wide bandwidth.

The key advantages of this antenna are its ultra-wideband performance (bandwidths of 10:1 or more are common) and its inherent capability to radiate circularly polarized waves. Its main drawbacks are relatively low gain and the need for a complex balanced feed network. It is widely used in applications requiring wideband operation, such as Electronic Countermeasures (ECM), broadband communications, and spectrum monitoring systems.

Conical Log Spiral Antenna