US Al (19) United States (12) Patent Application Publication (10) Pub. N0.: US 2013/ A1 Zhang et al. (43) Pub. Date: Mar.

Transcription

1 US Al (19) United States (12) Patent Application Publication (10) Pub. N0.: US 2013/ A1 Zhang et al. (43) Pub. Date: Mar. 28, 2013 (54) MULTI-BAND WIRELESS TERMINALS WITH Publication Classi?cation MULTIPLE ANTENNAS ALONG AN END PORTION, AND RELATED MULTI-BAND (51) Int- Cl ANTENNA SYSTEMS H01Q 19/10 ( ) H01Q 1/00 ( ) (76) Inventors: Shuai Zhang, Lund (SE); Sailing He, (52) U-s- Cl Akersberga (SE); Kun Zhao Stockholm USPC /720; 343/834 (SE); Zhinong Ying, Lund (SE) (57) ABSTRACT An antenna system may include a backplate that includes an (21) Appl.No.: 13/247,358 end portion. The antenna system may also include?rst and second antennas spaced apart from each other along the end portion of the backplate. The antenna system may addition ally include a parasitic element between the?rst and second (22) Filed: Sep. 28, 2011 antennas along the end portion of the backplate. 120 / / 2 53 l/5o1l/5o // O \

2 Patent Application Publication Mar. 28, 2013 Sheet 1 0f 18 US 2013/ A1 128 PSTN 1% FIGURE

3 Patent Application Publication Mar. 28, 2013 Sheet 2 0f 18 US 2013/ A1 /12O Multi-Band Antenna 246 System l TRANSCEIVER 2Q TX/RX TX/RX E 2515 DISPLAY ', m I KEYPAD I I MICROPHONE SPEAKER CAMERA & 2&8 FIGURE 2

4 Patent Application Publication Mar. 28, 2013 Sheet 3 0f 18 US 2013/ A FIGURE 38

5 Patent Application Publication Mar. 28, 2013 Sheet 4 0f 18 US 2013/ A1 / FIGURE 4

6 Patent Application Publication Mar. 28, 2013 Sheet 5 0f 18 US 2013/ A FIGURE 5

7 Patent Application Publication Mar. 28, 2013 Sheet 6 0f 18 US 2013/ A / 300 / FIGURE 6

8 Patent Application Publication Mar. 28, 2013 Sheet 7 0f 18 US 2013/ A FIGURE 7

9 Patent Application Publication Mar. 28, 2013 Sheet 8 0f 18 US 2013/ A1 FIGURE 8

10 Patent Application Publication Mar. 28, 2013 Sheet 9 0f 18 US 2013/ A1 ll [gm 5.: mauueied g

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12 Patent Application Publication Mar. 28, 2013 Sheet 11 0f 18 US 2013/ A1 first second antenna antenna FIGURE 11A first second antenna antenna FIGURE 11B

13 Patent Application Publication Mar. 28, 2013 Sheet 12 0f 18 US 2013/ A1 FIGURE 12

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15 Patent Application Publication Mar. 28, 2013 Sheet 14 0f 18 US 2013/ A1 12 /501I/ 502 /503,ELI l 504 / \ / FIGURE 14

16 Patent Application Publication Mar. 28, 2013 Sheet 15 0f 18 US 2013/ A1 COMPLEX EFFHII EEHEHSRE } [UMPLEJZ EFFICIHKHM [URRELMIDH [URRELMEUN [UEFFIUEM COEFFICIENT I155 {EH1} M? 51 1.? [EH [Bi-F1} : (EH1) 0.0] IE [1.9 {EH1} (EH1) ' [5H1] ,2 (6H1) 0.03 N [1.95 [EH1] M? 56 2:1 (6H2) 0.01 I? [1.96 [5H2] (5H1) AIM] H] FIGURE 15

17 Patent Application Publication Mar. 28, 2013 Sheet 16 0f 18 US 2013/ A A FIGURE

18 Patent Application Publication Mar. 28, 2013 Sheet 17 0f 18 US 2013/ A1 m2 MEDQE

19 Patent Application Publication Mar. 28, 2013 Sheet 18 0f 18 US 2013/ A1 Q In o 00 m T. FIGURE 16C

20 US 2013/ A1 Mar. 28, 2013 MULTI-BAND WIRELESS TERMINALS WITH MULTIPLE ANTENNAS ALONG AN END PORTION, AND RELATED MULTI-BAND ANTENNA SYSTEMS FIELD [0001] The present inventive concept generally relates to the?eld of communications and, more particularly, to anten nas and Wireless terminals incorporating the same. BACKGROUND [0002] Wireless terminals may operate in multiple fre quency bands (i.e., multi-band ) to provide operations in multiple communications systems. For example, many cellu lar radiotelephones are designed for operation in Global Sys tem for Mobile Communications (GSM), Wideband Code Division Multiple Access (WCDMA), and Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) modes at nominal frequencies such as 850 MegahertZ (MHZ), 900 MHZ, 1800 MHZ, 1900 MHZ, and/or 2100 MHZ. [0003] Achieving effective performance in multiple fre quency bands may be dif?cult. For example, contemporary Wireless terminals are increasingly including more circuitry and larger displays and keypads/keyboards Within small housings. Constraints on the available space and locations for antennas in Wireless terminals can negatively affect antenna performance. [0004] For example, although Wireless terminals may include multiple antennas, mutual coupling between different antennas may degrade performance. Moreover, if a Wireless terminal uses its chassis as a shared radiator for multiple antennas operating in low frequency bands (e.g., below about one (1.0) GigahertZ (GHZ)), then mutual coupling may par ticularly degrade performance in the low frequency bands. SUMMARY [0005] Some embodiments of the present inventive concept include a multi-band Wireless communications terminal. The multi-band Wireless communications terminal may include a backplate covering a multi-band transceiver circuit con?g ured to provide communications for the multi-band Wireless communications terminal via a plurality of frequency bands. The multi-band Wireless communications terminal may also include?rst and second antennas spaced apart from each other along an end portion of the backplate, Wherein the multi-band transceiver circuit is con?gured to communicate through the?rst and second antennas via the plurality of frequency bands. The multi-band Wireless communications terminal may further include a parasitic element between the?rst and second antennas along the end portion of the back plate. [0006] In some embodiments, each of the?rst and second antennas may include a radiating element and a scattering element con?gured to re?ect radiation from the radiating element. [0007] In some embodiments, each of the?rst and second antennas may include?rst and second spaced-apart portions, the?rst portion partially surrounding the second portion. [0008] In some embodiments, a?rst side section of the?rst portion may be between the second portion and the parasitic element. Also, a second side section of the?rst portion may be spaced apart from the second portion. Additionally, an end section between the?rst and second side sections of the?rst portion may be spaced apart from the second portion. [0009] In some embodiments, the second side section of the?rst portion may be spaced apart from the second portion by less than about 1.4 millimeters. Also, the end section between the?rst and second side sections of the?rst portion may be spaced apart from the second portion by less than about 0.8 millimeters. [0010] In some embodiments, the?rst portion may sur round a majority of a perimeter of the second portion. [0011] In some embodiments, the multi-band Wireless communications terminal may further include a speaker on the parasitic element between the?rst and second antennas along the end portion of the backplate. [0012] In some embodiments, the multi-band Wireless communications terminal may further include an antenna housing con?gured to cover the?rst and second antennas, and further con?gured to provide an acoustic cavity for the speaker. [0013] In some embodiments, the multi-band Wireless communications terminal may further include a third antenna on the parasitic element between the?rst and second anten nas. [0014] In some embodiments, the third antenna may include a Global Positioning System (GPS) antenna. [0015] In some embodiments, the multi-band Wireless communications terminal may further include a dielectric block along the end portion of the backplate, Wherein the?rst and second antennas and the parasitic element are on the dielectric block. [0016] In some embodiments, each of the?rst and second antennas may be on?rst and second sides of the dielectric block. Also, the?rst side of the dielectric block may be substantially parallel With a primary surface of the backplate. Moreover, the second side of the dielectric block may include an outer edge of the dielectric block. [0017] In some embodiments, the?rst side of the dielectric block may include a perimeter portion that shares a boundary With a perimeter portion of the end portion of the backplate. [0018] In some embodiments, the dielectric block may have a Width of less than about 55.0 millimeters and a thick ness of less than about 5.0 millimeters. [0019] In some embodiments, the?rst and second antennas may include printed metals. [0020] In some embodiments, the parasitic element may include a printed metal?lm. [0021] A multi-band Wireless communications terminal according to some embodiments may include a backplate covering a multi-band transceiver circuit con?gured to pro vide communications for the multi-band Wireless communi cations terminal via a plurality of frequency bands. The multi band Wireless communications terminal may also include a dielectric material along an end portion of the backplate. The multi-band Wireless communications terminal may addition ally include?rst and second antennas spaced apart from each other on the dielectric material, each of the?rst and second antennas including a radiating element and a scattering ele ment con?gured to re?ect radiation from the radiating ele ment, Where the multi-band transceiver circuit is con?gured to communicate through the?rst and second antennas via the plurality of frequency bands. The multi-band Wireless com munications terminal may further include a parasitic metal strip between the?rst and second antennas on the dielectric material.

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