Md. Rashidul Islam, Student Member, IEEE and Mohammod Ali, Senior Member, IEEE

Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals Md. Rashidul Islam, Student Member, IEEE and Mohammod Ali, Senior Member, IEEE Presenter : 許仲瑋

OUTLINE • INTRODUCTION • ANTENNA CONFIGURATION • THE ESPAR ANTENNA IN FREE SPACE • THE ESPAR ANTENNA IN PRESENCE OF HEAD AND HAND MODELS • CONCLUSION

INTRODUCTION • 在本文中提出了一個被動控制內部 ESPAR天線系統包括一個驅動平面倒F天線和兩個相鄰的倒L形天線操作在1900MHz的GSM頻段。本文組織如下。 • 首先，在天線的幾何形狀中，給予適當的範圍內的電容和決定驅動和寄生天線單元之間的距離。 • 其次，輻射模式的結果，提出利用HFSS其次是模擬和測量結果的回波損耗。 • 第三，SAR和天線增益計算使用XFDTD的一個真正的頭部解剖模型介紹。 • 最後，通過研究對電容的影響使雙波段天線波束掃描能力在1900MHz。

ANTENNA CONFIGURATION The proposed ESPAR antenna system consists of a PIFA and two inverted L antennas (ILA) as shown in Fig. 1. Fig. 1. The three-element electrically steerable parasitic array radiator (ESPAR) antenna 本圖引用自Islam, M.R. ; Ali, M., “Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals,” Antennas and Propagation, IEEE Transactions on, Oct 2010

ANTENNA CONFIGURATION Baseline Effective Capacitance Range Fig. 2. An ILA with its capacitor arrangements in the proposed ESPAR antenna. 本圖引用自Islam, M.R. ; Ali, M., “Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals,” Antennas and Propagation, IEEE Transactions on, Oct 2010

ANTENNA CONFIGURATION Baseline Effective Capacitance Range Fig. 3. Variation of Г with capacitance C1: (a) magnitude of Г and (b) phase of Г. Parameters: l1=29 mm, l2=2 mm, h=6 mm, w=3 mm, f=1.85 GHz, 1.92 GHz and 1.99 GHz. 本圖引用自Islam, M.R. ; Ali, M., “Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals,” Antennas and Propagation, IEEE Transactions on, Oct 2010

THE ESPAR ANTENNA IN FREE SPACE Radiation Patterns 本圖引用自Islam, M.R. ; Ali, M., “Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals,” Antennas and Propagation, IEEE Transactions on, Oct 2010

THE ESPAR ANTENNA IN FREE SPACE Input Characteristics Fig. 9. S11 plots of the ESPAR antenna using varactor diodes. Computed data correspond to the geometrical model of Fig. 1. Fig. 8. Fabricated prototype of the proposed ESPAR antenna. Two varactor diodes (SMV 1248) provided the variable capacitances 本圖引用自Islam, M.R. ; Ali, M., “Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals,” Antennas and Propagation, IEEE Transactions on, Oct 2010

THE ESPAR ANTENNA IN PRESENCE OF HEAD AND HAND MODELS Case I: The antenna was placed vertically against the Duke head model (see Table-III).  Case II: A heterogeneous hand model consisting of 12 tissues was added (see Table-III). The hand was cropped from the Visible Human Body using Varipose. The tissue properties of the hand model were also taken from. The distance between the antenna ground plane and the head model was 10 mm for both cases. Table III: Peak 1g and 10g averaged SAR in the head model due to the ESPAR antenna and the single PIFA. Input power: 250 mW, frequency: 1.92 GHz, distance: 10 mm.

THE ESPAR ANTENNA IN PRESENCE OF HEAD AND HAND MODELS Input Characteristics in the Presence of Head and Hand Fig. 12: Computed input characteristics of the ESPAR antenna for Case II. 本圖引用自Islam, M.R. ; Ali, M., “Elevation Plane Beam Scanning of a Novel Parasitic Array Radiator Antenna for 1900 MHz Mobile Handheld Terminals,” Antennas and Propagation, IEEE Transactions on, Oct 2010

CONCLUSION • 本文所提出的ESPAR天線系統所組成的驅動和被動終止內部天線和其獨特的輻射和輸入特性對於未來的攜帶式或是可穿戴式的無線設備是非常有行性的。

心得感想 • 在做這次報告之前，沒有接觸過太多屬於天線的專業領域，因此這份PAPER看的相當吃力，也因為自已沒有多少天線的基礎去支撐，使的自己到目前對這份報告還是模糊不清，但我想，接觸多一點領域對自己的未來還是有相當大的幫助的。

Md. Rashidul Islam, Student Member, IEEE and Mohammod Ali, Senior Member, IEEE