5) Antenna properties and types of chip inductors

Here, 4 kinds of chip inductors were used for tuning as specified in Table 5-1 in order to see the effect on antenna properties. Inductor chip size is 1608 (0603). Toko’s chip inductor LL1608 is a multilayer type, and the other three are wound type. In this experiment antenna sample dimensions were the same as the standard antenna sample in section 1.


As shown in Table 5-1, there were few differences between antenna properties in three samples in which wound type chip inductors are used . In comparison, the sample with multilayer chip inductors has lower antenna gain by about 1.4dB. Toko’smultilayer type chip inductors LL1608 have small Q values comparing to wound type as shown in Table 5-2. This low Q-value of multilayer chip inductors LL1608 results in a lower antenna gain.

 

Chip Inductor L1 L2 L1+L2 L3 VSWR
at 430MHz
BW Gain
type
manufacture [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

Table5-1 Antenna properties dependence on the type of chip inductors

 

 

Manufacture 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

Table5-2 Q values of chip inductors(catalog value)

 

 

 

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