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The microwave dielectric ceramic is used in the microwave band and is very effective for making smaller devices and improving the packaging density of microwave integrated circuits. For this reason, it is widely used for filters for mobile communication apparatuses (for base station and terminals) including cell phones, microwave transmitting circuit for receiving satellite broadcasting, GPS antenna, bluetooth, and recently for ITS (Intelligent Transportation System).
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■Features
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The specific inductive capacity (εr) is large, the microwave circuit can be made smaller, and the dielectric loss is very small so that a high Q value can be obtained in the microwave area. |
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Since the frequency temperature coefficient (τf) is compensated, a stable circuit configuration can be made. |
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Since variance in the specific inductive capacity is small (stable), a good circuit configuration can be made. |
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In accordance with applications, various shapes are available to meet your requirements. |
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■Major Types and Features
| Material name |
Dielectric resonator |
Dielectric board |
| Disk type |
Cylindrical type |
Square
cylindrical type |
Square
plate type |
Square
block type |
| Shape |
 |
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| Characteristic |
High Q value |
High Q value
Usable for smaller type |
Usable for smaller type |
High dimensional accuracy |
Usable for
smaller type
High dimensional |
| Dimensions |
D=50 or smaller
L=30 or smaller |
D=50 or smaller
d=0.5 or larger
L=30 or smaller |
A=40 or smaller
a=0.5 or larger
L=30 or smaller |
A, B=51 or smaller
T=0.1~8.0 |
A, B=25 or smaller
a=0.6 or larger
T=6 or smaller |
Applicable
dielectric material |
M20~45 |
M20~110 |
M20~110 |
M20~180 |
M20~110 |
Specific
inductive capacity |
20~45 |
20~110 |
20~110 |
20~200 |
20~110 |
| Notes |
Available to add support
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AG metalization only
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AG metalization only
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■Characteristics of materials
| Material name |
εr |
fo•Q |
τf
(10~50°C)
(ppm/°C) |
Specific gravity
(g/cm3 ) |
| M6.8 |
6.8±0.5 |
≥25000 |
-20±5 |
3.0 |
| M8 |
8.5±0.5 |
≥40000 |
-10±5 |
3.1 |
| *M20 |
20.5±0.5 |
≥50000 |
0±5 |
3.8 |
| M24 |
24.0±1.0 |
≥200000 |
1.5±5 |
7.5 |
| M29 |
29.0±1.0 |
≥170000 |
0±1 |
7.7 |
| M34 |
33.5±1.0 |
≥90000 |
3± 2 |
7.0 |
| *M38 |
38.0±0.5 |
≥35000 |
8± 3 |
4.6 |
| *M39 |
40.0±1.0 |
≥30000 |
5±5 |
5.2 |
| M45 |
45.0±2.0 |
≥40000 |
3±1 |
4.7 |
| M80 |
82.0±2.0 |
≥8000 |
5±5 |
5.7 |
| M93 |
93.0±2.0 |
≥6000 |
8±3 |
5.7 |
| M110 |
110.0±3.0 |
≥3300 |
5±5 |
5.7 |
| M130 |
129.0±2.0 |
≥1800 |
45±10 |
5.9 |
| M140 |
134.0±4.0 |
≥2000 |
30±10 |
4.8 |
| M180 |
185.0±4.0 |
≥100 |
-140±30 |
4.8 |
* : mass production materials |
MARUWA's dielectric items are classified into 3 types.
| 1. |
Coaxial resonator (TEM mode) |
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This is mainly used for filters for communication apparatuses (band pass filter [BPF] , duplexer [DUP] ) and VCO. |
| 2. |
LNB (TE018 Mode) |
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This is mainly used as an antenna resonator for receiving satellite broadcasting. |
| 3. |
GPS, board |
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Antenna block is used as a plane antenna (GPS antenna) for car navigation, W-LAN, bluetooth, mobile phone antennas.
The board is used as the material for single-layer capacitors such as filters and isolators.
The using methods for 1, 2, and 3 and specific shapes are as follows. |
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COPYRIGHT 2009 MARUWA Co., Ltd. ALL RIGHT RESERVED.
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