ANT-433-CW-RH-SMA

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Revised 1/5/2017

Product Description

The RH Series utilizes a helical element to greatly

reduce the physical length of the antenna housing.

They are ideal for small products where cosmetic

or functional requirements dictate a compact,

aesthetically pleasing antenna package. Despite

their tiny size, RH Series antennas are ruggedly

• Excellent performance

• Omni-directional pattern

• Low VSWR

• Fully weatherized

• Rugged & damage-resistant

• SMA or Part 15 compliant RP-SMA connector

• Available in black or custom colors

• Use with plastic* or metal enclosures

* Requires proximity ground plane

Electrical Specications

Impedance: 50-ohms

Connection: RP-SMA or SMA

Oper. Temp. Range: –40°C to +90°C

Electrical specifications and plots measured on 10.16 cm x

10.16 cm (4.00” x 4.00”) reference ground plane

Ordering Information

ANT-433-CW-RH (with RP-SMA connector)

ANT-433-CW-RH-SMA (with SMA connector)

ANT-433-CW-RH

Data Sheet

(2.00")

(0.15")

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Copyright © 2017 Linx Technologies

159 Ort Lane, Merlin, OR 97532

The size and location of the ground plane relative to the antenna will affect the overall performance of the

antenna in the final design. When used in conjunction with a ground plane smaller than that used to tune the

antenna, the center frequency typically will shift higher in frequency and the bandwidth will decrease. The

proximity of other circuit elements and packaging near the antenna will also affect the final performance. For

further discussion and guidance on the importance of the ground plane counterpoise, please refer to Linx

Application Note AN-00501: Understanding Antenna Specifications and Operation.

VSWR Graph

The Voltage Standing Wave Ratio (VSWR) is a measurement of how well an antenna is matched to a source

impedance, typically 50-ohms. It is calculated by measuring the voltage wave that is headed toward the load

versus the voltage wave that is reflected back from the load. A perfect match has a VSWR of 1:1. The higher

the first number, the worse the match, and the more inefficient the system. Since a perfect match cannot

ever be obtained, some benchmark for performance needs to be set. In the case of antenna VSWR, this

is usually 2:1. At this point, 88.9% of the energy sent to the antenna by the transmitter is radiated into free

space and 11.1% is either reflected back into the source or lost as heat on the structure of the antenna. In

the other direction, 88.9% of the energy recovered by the antenna is transferred into the receiver. As a side