Small‐size coupled‐fed shorted T‐monopole for internal WWAN antenna in the thin‐profile mobile phone

Abstract

on the measured data, and the MAEs were calculated to confirm the feasibility. The MAEs of S 11 and S 21 extracted from the equivalent circuit using lumped elements were 0.591 dB and 0.146 dB, respectively. The S 11 and S 21 extracted from the equivalent circuit using physical microstrip lines show MAEs of 0.926 dB and 0.179 dB, respectively. The measured RF characteristics showed good agreement with both the proposed electrical equivalent circuits using lumped elements and physical microstrip lines from 1 to 30 GHz. The proposed packaging method has a good RF performance as well as a simple process, easy integration, and good compatibility with IC and RF MEMS devices. It is expected that the proposed LTCC-based packaging structure and the electrical modeling can provide a practical reference in designing and demonstrating the RF MEMS devices. REFERENCES 1. H. Reichl and V. Grosser, Overview and development of trends in the field of MEMS packaging, In:cation and characterization of RF MEMS package based on LTCC lid substrate and gold-tin eutectic bonding, Transducers '07, Lyon, France, 2007, pp. 2115-2118. 9. Available at: http://en.wikipedia.org/wiki/Mean_absolute_error.ABSTRACT: A coupled-fed shorted T-monopole with a small size of 15 Â 26 mm 2 (390 mm 2 ) printed on the system circuit board of the mobile phone for WWAN operation is presented. By using a simple inverted-L feeding strip to capacitively excite the shorted T-monopole, two wide operating bands at about 900 and 1900 MHz, respectively, to cover GSM850/900 and GSM1800/1900/UMTS operations are obtained. The antenna is an all-printing structure, with no external matching circuit on the system circuit board or lumped circuit elements embedded in the antenna required for size reduction or bandwidth enhancement.The antenna is hence easy to fabricate at low cost and is especially suited for thin-profile mobile phone applications. The occupied area (less than 400 mm 2 ) of the antenna printed on the system circuit board of the mobile phone in this study is among the smallest for the internal uniplanar printed antenna capable of penta-band WWAN operation that have been reported. Details of the proposed antenna are described, and the obtained results, including its SAR (specific absorption rate) study, are presented and discussed.

Impact of Antenna Design on MIMO Performance for Compact Terminals With Adaptive Impedance Matching

“…Prototype B as shown in Fig. 4(b) is based on [32] and comprises of two compact dual-band monopole antennas of an identical design. The antenna elements consist of a two-branch feeding element along with a parasitic element extended from the ground plane for dual-band excitation.…”

On User Effects in MIMO Handset Antennas Designed Using Characteristic Modes

“…Prototypes P1 [6] and P2 [5] employ TCM to excite orthogonal radiation patterns. P3 consists of two coupled-fed monopoles co-located on one shorter edge of the chassis [10], whereas P4 consists of a planar inverted-F antenna (PIFA) and a monopole [11]. P5 is based on two inverted-F (IFA) antennas placed at two shorter edges of the terminal [12].…”

Compact, Printed, Standalone Penta-Band Antenna for Wwan Operation

“…Compact and printed planar antennas capable of providing multiband operation in the GSM850 (824-894 MHz), GSM900 (880-960), GSM1800 (1710-1880 MHz), GSM1900 (1850-1990 MHz), and UMTS (1920-2170 MHz) bands for wireless wide area network (WWAN) operation with the impedance-bandwidth requirement by a voltage standing wave ratio (VSWR) of 3 have recently been reported for wireless communications devices such as mobile phones [1][2][3][4][5] and laptops [6,7] in the open literature. These printed antennas studied are all based on the antennas placed on or integrated with a large system/antenna ground plane to properly excite the antenna in the case of either the antenna as a matching element to couple to the ground-plane resonance or the antenna to be the main radiator [8].…”