Low‐profile multiband planar hybrid antenna design for mobile handset applications

Sim, Chow‐Yen‐Desmond; Cheng, Po-Chun; Lee, Ching-Her

doi:10.1002/mop.25889

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…Many internal handset antennas to cover the penta‐band wireless wide area network (WWAN) operation in the 824–960 and 1710–2170 MHz bands have been reported [1–13]. However, most of the reported designs did not consider close integration of the internal WWAN antenna with nearby system ground plane on the main circuit board of the handset.…”

Section: Introductionmentioning

confidence: 99%

Low‐profile, small‐size, wireless wide area network handset antenna close integration with surrounding ground plane

Chen

2012

Micro & Optical Tech Letters

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An internal wireless wide area network (WWAN) handset antenna having a low profile of 3 mm, small footprint of 30 × 10 mm2, and closely integrated with surrounding ground plane is presented.The antenna volume is 0.9 cm3 only and can provide two wide‐operating bands to cover the desired 824–960 and 1710–2170 MHz bands. The major portion of the antenna is printed on the main circuit board of the handset, and the antenna has a simple structure formed by a strip monopole and a parasitic shorted strip monopole. Two techniques are applied in the proposed design to achieve penta‐band WWAN operation with a small antenna size. The first technique is to load a proper chip inductor at a proper position in the shorted strip monopole, which supports a resonant mode for the antenna's lower band with a resonant length much smaller than 0.25‐wavelength. The second one is to use a band‐stop matching circuit disposed on the main circuit board of the handset. The combined effects of the two techniques are discussed in this article. Also, the proposed antenna shows low near‐field radiation characteristic and meets the specific absorption rate and hearing‐aid compatibility requirements for practical handset applications. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:623–629, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26633

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Section: Introductionmentioning

confidence: 99%

Low‐profile, small‐size, wireless wide area network handset antenna close integration with surrounding ground plane

Chen

2012

Micro & Optical Tech Letters

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“…Recently, the techniques of applying parasitic element [10, 11] and integrating two different antenna structures (also refer to as hybrid antenna) [12–14] have been proposed to achieve multiband operation for mobile handset applications. For the parasitic element technique, single [10] or multiple [11] parasitic elements are coupled to the main radiating element so that bandwidth enhancement can be achieved.…”

Section: Introductionmentioning

confidence: 99%

“…In comparison, the hybrid antenna technique can also enhance the bandwidth by combining different resonant modes excited from two entirely different antenna types. Notably, one of the main advantages of such design is the ability to control the two antenna types separately, so that easy adjustment of all the excited modes can be achieved [14]. From Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Although Ref. 14 is a low‐profile planar type that allows GSM/DCS/PCS/UMTS/WLAN operations, it is also a combination of monopole slot antenna and a T‐monopole antenna coupled to an open‐loop back coupling strip. Note that this monopole slot antenna type requires a certain region to be reserved from the system ground plane (so that the open‐end slot can be loaded), thus, such antenna type might not be feasible if only a small ground plane is available, or the entire system ground plane is to be used by the RF circuit.…”

Section: Introductionmentioning

confidence: 99%

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A multiband hybrid antenna with double layer structures for mobile devices

Sim

Chao

2012

Micro & Optical Tech Letters

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fiber end under test and the fiber for detection were measured at 1.31-and 1.55-lm wavelengths using laser diodes (LDs), an optical power meter (OPM), and 3-dB coupler. When both the measured return losses at those two wavelengths were equal to $14.7 dB (from 14.7 to 15.7 dB in our experiments), the part of the fiber end under test could be identified as uneven [shown in Fig. 1 (a)]. If one of the two losses is not equal to $14.7 dB, the part can be identified as flat [shown in Fig. 1(b)]. Every part of the fiber end under test is covered under the scanning inspection areas and can be determined as uneven or flat. Consequently, the cleaved fiber end under test can be identified as successful or failed.In the experiments, the gap between the fiber for detection and the fiber under test was set to 40 lm, and each scanning distance was set to 10 lm. Typical experimental results are shown in Figure 4. In the figure, (a) and (c) show the flat parts of the inspected fiber end found using the proposed inspection method and (b) and (d) shows the SEM image of the flat end. The fiber ends in Figures 4(a) and 4(c) were found to be correctly and incorrectly cleaved, respectively. The experimental image with a correctly cleaved fiber end shows that the flat parts form a circle of about 140-lm diameter, which is a little larger than the actual 125-lm diameter fiber end. This is because a mode field area of light may radiate from the fiber end for detection. In contrast, the experimental results for the incorrectly cleaved fiber end show that half the fiber end parts are flat and the remainder is uneven. The results of the proposed inspection method and those from SEM observation are in good agreement. CONCLUSIONWe have proposed and demonstrated a novel fiber optic sensor for inspecting cleaved fiber end based on the Fabry-Perot interferometer. The sensor uses LDs, OPM, 3-dB coupler, and XY lateral adjustment stage. The images obtained for the inspected fiber ends were in good agreement with SEM observation images.ABSTRACT: The design of a hybrid antenna with double layer structures that allow multiband operation in the global system for mobile communications/digital communication systems/personal communication system/universal mobile telecommunications system and wireless local area network band bands is presented. By combining the resonant modes excited separately by the upper layer planar inverted-F antenna structure (0.88, 0.97, and 1.18 GHz) and lower layer monopole antenna type structure (1.38, 1.76, and 2.45 GHz), a dual-frequency operation with broadband characteristics can be observed, whereby the lower and upper frequency bands are operating between 0.86 and 1.00 GHz and between 1.15 and 2.63 GHz, respectively. From the experimental results, stable gain and good radiation efficiency are also exhibited within the bands of interest. V C 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1543-1548, 2012; View this article online at wileyonlinelibrary.com.

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Multi-Radio Frequency Antenna for Sub-6 GHz 5G Carrier and Data Link Margin Enhancement

Enahoro,

Ekpo,

Gibson

et al. 2024

The Second International Adaptive and Sustainable Science, Engineering and Technology Conference

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Low‐profile multiband planar hybrid antenna design for mobile handset applications

Cited by 5 publications

References 8 publications

Low‐profile, small‐size, wireless wide area network handset antenna close integration with surrounding ground plane

Low‐profile, small‐size, wireless wide area network handset antenna close integration with surrounding ground plane

A multiband hybrid antenna with double layer structures for mobile devices

Multi-Radio Frequency Antenna for Sub-6 GHz 5G Carrier and Data Link Margin Enhancement

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