1. Reporter: Shih-Sian Zeng Adviser: Chien-Min Cheng
Develop Dual-Band CPW Asymmetric Monopole Antennas on the Aluminum Oxide Substrates
Reporter: Shih-Sian Zeng
Adviser: Chien-Min Cheng
Southern Taiwan University
Department of Electronic Engineering

2. Outlines Introduction Substrates and Antenna Design
Paper Review
Purpose
Substrates and Antenna Design
Results and Discussion
Conclusions
Southern Taiwan University
Department of Electronic Engineering

3. Introduction Paper Review Southern Taiwan University
1.In this letter, for the purpose of miniaturization and dual-band operation, it was found that the CPW structure is a suitable selection for the design of coplanar antenna, and the asymmetric structure can reduce about half of the size of the antenna.
2.Due to the high dielectric constant (εr=9.8) of the Al2O3 ceramic substrates and high quality factor (Q׃=300,000) to minimize the antenna size
W.-C. Liu and C.-F. Hsu 〝Dual-band CPW-fed Y-shaped monopole antenna for PCS/WLAN application〞
ELECTRONICS LETTERS 31st March 2005 Vol. 41 No. 7
Southern Taiwan University
Department of Electronic Engineering

4. Introduction Purpose Asymmetric structure to reduce antenna
Size by half
High dielectric constant subatrate
Improving high-frequency stability
1.In this letter, for the purpose of miniaturization and dual-band operation, it was found that the CPW structure is a suitable selection for the design of coplanar antenna, and the asymmetric structure can reduce about half of the size of the antenna.
2.Due to the high dielectric constant (εr=9.8) of the Al2O3 ceramic substrates and high quality factor (Q׃=300,000) to minimize the antenna size
CPW-fed is adopted this antenna
Easily with other integrated circuits
Southern Taiwan University
Department of Electronic Engineering

5. Outlines Introduction Substrates and Antenna Design
Substrates Selection
Design Process
Antenna Geometric
Results and Discussion
Conclusions
Department of Electronic Engineering
Southern Taiwan University
Department of Electronic Engineering

6. Dielectric Loss Tangent
Materials and Antenna Design
Material Selection
Silver Paste
Al2O3 Substrate
substrate
Substrate
Dielectric Constant
Dielectric Loss Tangent
( Q × ƒ )
Price
FR4
4.4
0.02
Very low
Rogers RO3010
10.2
0.0035
Very high
Rogers RT/Duroid 6010
0.0023
Al2O3
9.8
0.001
300,000
low
In the past, most of the wireless communication devices adopted FR4 as their substrates, which exhibited lower dielectric constant and quality factor than the ceramic substrates. Hence, in this letter, an asymmetric monopole dual-band CPW antenna is developed and screen-printed on the Aluminum Oxide (Al2O3) ceramic substrate.
Southern Taiwan University
Department of Electronic Engineering

7. Materials and Antenna Design
Design Process
Fired in an Oven (750ºC/30min)
Selection
(Band)
Antenna Design
(HFSS Simulator)
Connect
(SMA)
Screen-Printed
(Mask , Ag/Pd )
Network Analyzer
(Frequency)
Radiation Patterns
(E-plane , H-plane , Gains)
Southern Taiwan University
Department of Electronic Engineering

8. Materials and Antenna Design
Antenna Geometric
CPW-fed Monopole Structure parameter (unit : mm) Wf g s L L1 L2 L3
1.5
0.5 1 20 16
6.5 4 L4 W W1 W2 W3 h
2.5
10.8
8.7
5.8 7
Southern Taiwan University
Department of Electronic Engineering

9. Outlines Introduction Substrates and Antenna Design
Results and Discussion
Simulated S11 Results due to the Variation of L1
Simulated and Measured S11 Results
Measured Radiation Patterns
Measured Peak Gains
Conclusions
Southern Taiwan University
Department of Electronic Engineering

10. Results and Discussion
Simulated S11 Results due to the Variation of L1 L1
(mm) ƒL
(GHz) ƒH
BW of ƒH
(GHz/%) 15
2.47
5.38
0.82/15.2
15.5
5.295
0.81/15.3 16
2.45
5.18
0.8/15.4
16.5
2.43
5.08
0.98/19.3 17
2.42
4.98
0.76/15.3
S11 (dB) L1
Frequency (GHz)
Southern Taiwan University
Department of Electronic Engineering

11. Results and Discussion
Simulated and Measured S11 Results ƒL
(GHz) ƒH
Simulated
2.45
5.18
Measured
2.455
5.4
S11 (dB)
BW of ƒL
(%)
BW of ƒH
Simulated
14.8 11
Measured
15.3
11.6
Frequency (GHz)
Southern Taiwan University
Department of Electronic Engineering

12. Results and Discussion
Measured Radiation Patterns
2.4GHz
5.2GHz
Southern Taiwan University
Department of Electronic Engineering

13. Results and Discussion
Measured Peak Gains
0.2 dBi
3.48 dBi
(a) 2.3~2.5 GHz
(b) 5.1~5.9 GHz
Southern Taiwan University
Department of Electronic Engineering

14. Outlines Introduction Substrates and Antenna Design
Results and Discussion
Conclusions
Southern Taiwan University
Department of Electronic Engineering

15. Conclusions Minimized (20×10.8×1 mm3)
─ CPW-fed asymmetric monopole structures
─ High dielectric constant of the ceramic substrates
Dual-band operation (2.4/5.2 GHz ; WLAN band)
Measured S11 are 21.4 dB (at 2.45 GHz) and 19.1 dB (at 5.4 GHz)
Near omni-directional radiation patterns
Measured peak gains are 0.2 dBi (at 2.45 GHz) and 3.48 dBi (at 5.4 GHz)
Southern Taiwan University
Department of Electronic Engineering

16. Thanks for your attention
Q & A
Thanks for your attention
Southern Taiwan University
Department of Electronic Engineering