5) Antenna properties and types of chip inductors

We tested 4 manufacturers of chip inductors (Table 5-1) to see their effect on antenna properties. All inductors are 1608 (0603) size. All are wound except for Toko's multilayer LL1608. We used our standard evaluation board for all testing.


Table 5-1 shows there are only small differences in antenna properties when using the three brands of wound chip inductors. The multilayer chip inductor sample's gain is reduced by about 1.4dB. Toko's multilayer LL1608 chip inductors have small Q values compared to wound inductors as shown in Table 5-2. This low Q-value LL1608 inductor results in lower antenna gain.

 

 

Chip Inductor L1 L2 L1+L2 L3 VSWR
at 430MHz
BW Gain
Series
Manufacturer [nH] [nH] [nH] [nH] [MHz]
[dBd]
LQW18 Murata 24 220 244 27 1.05 16.06 -11.72
LLQ1608 Toko 1.8 220 221.8 26 1.18 17.64 -11.99
C1608 Sagami Elec 0 220 220 36 1.18 16.85 -11.88
LL1608 Toko 33 150 183 47 1.25 15.21 -14.31

Table 5-1 Type of chip inductor and its effect on antenna performance

 

 

Manufacturer Type L[nH] Q Test freq.
[MHz]
Note
Murata LQW18 220 40 250 Wound type
Toko LLQ1608 220 25 100 Wound type
Sagami Elec C1608 220 25 100 Wound type
Toko LL1608 150 20 100 Multilayer type

Table 5-2 Chip inductor Q-values (catalog value)

 

 

 

Copyright © Mitsubishi Materials Corporation All Rights Reserved.