Planar Spiral Antenna 4 dBi Typ. Gain, 1-4 GHz Frequency Range RM-PSA14-4R

Short Description:

RF MISO’s Model RM-PSA14-4R is a RHCP planar spiral antenna that operates from 1-4GHz. The antenna offers a gain 4dBi Typ. and low VSWR 1.5 Typ. with N-Female connector. It designed for EMC, reconnaissance, orientation, remote sensing, and flush mounted vehicle applications. These spiral antennas can be used as separate antenna components or as feeders for reflector satellite antennas.

Product Detail

Antenna Knowledge

Product Tags

Features

● Ideal for airborne or ground applications

● Low VSWR

● R-H Circular Polarization

● With Radome

Specifications

Parameters	Typical		Units
Frequency Range	1-4		GHz
Gain	4 Typ.		dBi
VSWR	1.5 Typ.
AR	1.5 Typ.		dB
3dB Beamwidth, E-Plane	66.20~98.17		°
3dB Beamwidth, H-Plane	62.01~98.08		°
XPD	35		dB
Polarization	R-H Circular Polarization
Connector	N-Female
Material	Al
Finishing	Paint Black
Size(LWH)	Ø140.0*80.0(±5)		mm
Weight	0.627		kg
Power Handling	CW:10	Peak:300	W
Antenna Cover	Yes
Waterproof	Yes

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A planar spiral antenna is a classic frequency-independent antenna renowned for its ultra-wideband characteristics. Its structure consists of two or more metallic arms that spiral outward from a central feed point, with common types being the Archimedean spiral and the logarithmic spiral.

Its operation relies on its self-complementary structure (where metal and air gaps have identical shapes) and the “active region” concept. At a specific frequency, a ring-like region on the spiral with a circumference of about one wavelength is excited and becomes the active region responsible for radiation. As the frequency changes, this active region moves along the spiral arms, allowing the antenna’s electrical characteristics to remain stable over an extremely wide bandwidth.

The key advantages of this antenna are its ultra-wide bandwidth (often 10:1 or greater), inherent capability for circular polarization, and stable radiation patterns. Its main drawbacks are its relatively large size and typically low gain. It is widely used in applications demanding ultra-wideband performance, such as electronic warfare, broadband communications, time-domain measurements, and radar systems.

Cavity Backed Spiral Antenna