ZTE Corporation ZM8300G Manuale Utente

ZTE ZM8300G Module Hardware User Manual

Smart meter reading products such

as water meters, electricity meters,

and gas meters

Meters are installed at remote

locations,

surrounding

environments are complex, the

signal attenuation is large, and

the signal quality is poor.

1. Internal antenna

2. High-gain antenna

3. Omni-directional

antenna

4. Low cost

Car detector

Car detectors are buried in the

ground, and the signal quality is

poor.

Smart city products such as smart

streetlights and smart garbage

cans

Smart city products are installed

outdoors, so they must be easy to

install

and

require

good

waterproofing measures.

1. External antenna

2. Waterproof and

corrosion resistant

3. Low cost

Mobile products

Mobile products provide the

positioning

function.

When

mobile products move, signals

change and are unstable.

1. GPS antenna with

excellent performance

2. Omni-directional

antenna pattern, if

possible

3. Low cost

Tracker products

Tracker products are carried by

people or animals, feature small

sizes,

and

have

high

requirements for the positioning

function.

1. GPS antenna with

excellent performance

2. Considering the

impact of people or

animals on the antenna

efficiency

3. Small sizes

4. Low cost

Passive parameters used to measure the performance of an antenna include the antenna

efficiency, VSWR, return loss (S11), polarization, and radiation pattern, which are described

as follows.

4.4.2

Antenna Efficiency

The efficiency of an antenna refers to the ratio of the power radiated by the antenna to the

effective input power. The power radiated by an antenna is generally less than the input

power due to antenna loss and cable loss. The antenna loss is primarily reflected by the

antenna efficiency. Specifically, high antenna efficiency indicates low antenna loss. The

antenna efficiency is affected by the VSWR/S11 and antenna clearance area. An antenna