Datasheet

APPLICATION SPECIFICATION
REVISION:
ECR/ECN INFORMATION:
TITLE:
868/915MHz Flexible Antenna
Application Specification
SHEET No.
A
EC No:
608264
6 of 20
DATE:
2018/12/03
DOCUMENT NUMBER:
CREATED / REVISED BY:
CHECKED BY:
APPROVED BY:
AS-2111400100
Liu Hai 2018/11/29
Cheng Kang 2018/11/29
Chris Zhong 2018/11/29
TEMPLATE FILENAME: APPLICATION_SPEC[SIZE_A](V.1).DOC
4.2 ANTENNA PERFORMANCE
DESCRIPTION
EQUIPMENT
REQUIREMENT
Frequency Range
VNA E5071C
868-870MHz
902-928MHz
Return Loss
VNA E5071C
<- 5dB
Peak Gain (Max)
OTA Chamber
0.3dBi
1.0dBi
Average Total Efficiency
OTA Chamber
>55%
>60%
Polarization
OTA Chamber
Linear
Input Impedance
VNA E5071C
50 ohms
Note that the above antenna performance is measured with just the antenna mounted on a
PC/ABS block to similar a free-space condition. When implement into the system, the frequency
resonant might be off-tune due to the loading of surrounding components especially metal plane.
This off-tune can be compensated through matching. Although module manufacturers specify a
peak gain limit, it is based on free-space conditions. The peak gain will be degraded by 1 to 2dBi
in the actual implementation as the radiation pattern will change due to the surround components.
As such, during selection of antenna, you can select one with high peak gain to compensate for
the loss. Molex can offer assistant to choose the best location and best tuning in-order to meet
this peak gain requirement.