ANT-2.4-WRT-MON [LINX]

Tamper resistant;


型号：	ANT-2.4-WRT-MON
厂家：	Linx Technologies
描述：	Tamper resistant
文件：	总2页 (文件大小：462K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ANT-2.4-WRT-MON-xxx

Data Sheet

Product Description

19.0 mm

(0.75")

The WRT-MON Series monopole antenna is

compact and tamper-resistant. It’s great for

applications like wireless vending machines, trafﬁc

equipment and power equipment where space is

limited and security is important.

27.0 mm

(1.06")

Adhesive Ring

Remove protective plastic

before installation

SMA or

RP-SMA

Unlike the WRT Series dipole antenna, the

WRT-MON Series monopole antenna requires

a proximity ground plane, which dramatically

reduces the space required inside the product.

The antenna is designed to be installed onto a

conductive surface with the metal base and nut

electrically connected to the surface serving as the

counterpoise. The antenna installs through a small

hole on the product and is anchored by a threaded

metal base connected to the coax cable shield.

An adhesive foam compression ring resists the

elements.

U.FL

8.5 mm

(0.34")

7/16-28

UNEF-2A

Thread

10.3 mm

(0.41")

i-PEX silouette

shown in

shadow

The WRT-MON Series antenna is available in

2.45GHz. It’s attached to a 216.0 mm (8.5")

long coax cable with an RP-SMA, SMA or U.FL/

MHF-compatible connector on the other end. The

RP-SMA and SMA connectors use an RG-174

coax. The U.FL/MHF connector uses a 1.32 mm

micro-coax. More connectors, colors and coax

length options are available for OEM customers.

Cable Length

216.0 mm

(8.50")

Electrical Speciﬁcations

Center Frequency:

Recom. Freq. Range:

Wavelength:

VSWR:

2.45GHz

2.4–2.5GHz

¼-wave

≤ 1.9 typical at center

0.8dBi

Features

•ꢀ Compact

•ꢀ Tamper resistant

•ꢀ Low cost

Peak Gain:

•ꢀ Indoor / outdoor

Impedance:

Connector:

Cable:

50-ohms

RP-SMA, SMA or U.FL / MHF

RG-174, RP-SMA & SMA

1.32 mm U.FL

–30°C to +80°C

4.0 kgf-cm

Ordering Information

ANT-2.4-WRT-MON-RPS (with RP-SMA connector)

ANT-2.4-WRT-MON-SMA (with SMA connector)

ANT-2.4-WRT-MON-UFL (with U.FL / MHF

compatible connector)

Oper. Temp. Range:

Max. Recom. Torque:

Electrical speciﬁcations and plots measured on 10.16 cm x

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

– 1 –

Revised 2/16/15

Counterpoise

Quarter-wave or monopole antennas require an associated ground plane

counterpoise for proper operation. 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

VSWR

1.543

Reflected Power

25%

3:1

2:1

11%

1:1

2350MHz

2450MHz

2550MHz

What is VSWR?

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 will have 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 note,

since the “:1” is always implied, many data sheets will remove it and just

display the ﬁrst number.

How to Read a VSWR Graph

VSWR is usually displayed graphically versus frequency. The lowest point

on the graph is the antenna’s operational center frequency. In most cases,

this will be different than the designed center frequency due to fabrication

tolerances. The VSWR at that point denotes how close to 50-ohms the

antenna gets. Linx speciﬁes the recommended bandwidth as the range

where the typical antenna VSWR is less than 2:1.

Data Sheet ANT-2.4-WRT-MON-xxx

– 2 –

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