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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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