A MIMO antenna for mobile applications

A multiband Multiple-Input Multiple-Output (MIMO) antenna for mobile phones applications in the next generation is proposed. The proposed MIMO antenna consists of two identical elements, each having three branches to generate two frequency bands, a wide higher and narrow lower frequency bands. Simulation results show that these two frequency bands can cover the lower band for Long-Term Evolution (LTE), the DCS1800, PCS1900 and UMTS-2100 bands, the Wibro Band, the 2.4-GHz band for the WLAN system and also the upper band for the WiMAX. By cutting a slit on the printed circuit board (PCB) serving the ground plane, a great enhancement of isolation between the two antenna elements can be achieved for the two frequency bands. © 2013 IEEE.published_or_final_versio

Design, Fabrication, and Measurement of a Multiple-Input Multiple-Output (MIMO) Antenna for Mobile Communication

This thesis presents the design, fabrication and characterization of a multiband uniplanar MIMO antenna for hand-held mobile communication devices on LTE, WLAN, and WMAN networks. The antenna design methodology combined a variety of broadbanding techniques that resulted in a single-layer hybrid monopole antenna coupled to a meander line element and parasitic structures. The 115×55×1.54 mm antenna was fabricated using an FR4 composite material and occupies only a fractional volume within the size of an average cellular phone allowing ample space to integrate with existing hardware. Characterization of the MIMO antenna included input impedance, scattering parameters and radiation pattern cross sections that were all measured from 500-6500 MHz inside an anechoic chamber. The measurement results indicated four main operating regions of the multiband antenna centered at 875 MHz, 2300 MHz, 3500 MHz, and 5700 MHz with bandwidths of 240 MHz, 740 MHz, 190 MHz, and 370 MHz respectively. Scattering parameter measurements demonstrated excellent coverage of the desired communication spectrum, being able to operate on 30 of the 42 defined LTE bands, as well as common WLAN and WMAN bands. The radiation pattern cross sections in each of the operating regions showed non-directional behavior that is desirable for mobile communication devices. Additionally the envelope correlation coefficient calculated from the measured complex scattering parameters verified that the MIMO antenna achieved good system diversity. Overall, this work resulted in a multiband uniplanar MIMO antenna system suitable for hand-held mobile communication devices. Utilizing cost effective materials and simple geometries allowed fabrication using common methods. The novel antenna can support the high capacity required from evolving communication systems and represents a practical option for use within future generations of mobile devices

Design of a printed multiband MIMO antenna

A multiband MIMO antenna using planar technology is proposed for next generation mobile communication system. The antenna consists of two symmetrical monopole elements printed in parallel to each other at the upper and lower corners of a printed-circuit board (PCB) with a size 50×110 mm2 which is similar to the side of a mobile phone. The two monopoles have two branch strips to generate two frequency bands. By using a parasitic element in each monopole, a much enhanced bandwidth in the upper band can be obtained. A lumped-impedance network is designed to enhance matching at the input ports for the two antenna elements. Computer simulation is used to study, design and optimize the antenna. Results indicate that the proposed MIMO antenna has a very bandwidth enough to cover the LTE (lower band), DCS1800, PCS1900, UMTS-2100, Wibro Band, 2.4G-WLAN, and Wimax (upper band) systems. To enhance the isolation between the two monopole elements within the desirable frequency bands, a slit is cut in the middle on the PCB ground. The MIMO antenna a very low profile and low cost which makes the design very attractive for mobile phone applications. © 2013 EurAAP.published_or_final_versio

Antennit metallikuorisissa matkapuhelimissa

This master’s thesis studies the effects of a slotless, continuous metal cover of a mobile terminal on the performance of its antennas. Additionally, LTE MIMO antennas are designed together with GPS and Wi-Fi antennas. The cellular antennas should operate on 704–960MHz and 1.71–2.69 GHz with at least 30% efficiency, and the other antennas at 1.575 GHz, 2.4 GHz, and 5 GHz bands with 40% efficiency. The topic is studied by completing electromagnetic simulations. The used model of the mobile phone is much more accurate than the ones used in earlier studies. The simulations focus on the antenna structures, locations, and sizes, as well as feeding of them. Additionally, matching circuits are investigated, and designed for each antenna. The effect of the metal cover is studied with several test cases, each of which focuses on one parameter, e.g. a dimension, location, or feed of the antenna. The first simulations are done with a simple model, and a concept for the cellular antennas is constructed on the basis of the obtained results. The final simulations are completed, and the antennas optimized with the accurate model. The proposed structure consists of three closely located, strongly coupling elements. The cellular antennas are at distinct ends of the device, and integrated into the side metals. GPS and Wi-Fi antennas are also integrated into the sides, and placed in the area between the ends of the phone. The main challenge due to the metal-cover is obtaining sufficient and wideband matching. Regardless the challenging environment, all the designed antennas fulfill their requirements. Based on the results, achieving a good antenna performance in a metal-covered phone is not impossible.Tässä diplomityössä tutkitaan matkapuhelimen yhtenäisen metallikuoren vaikutusta antennien suorituskykyyn. Työssä suunnitellaan myös LTE-taajuuksilla toimiva MIMO-antenni sekä GPS- ja Wi-Fi-antennit. Matkapuhelinantennien tulee toimia taajuuksilla 704–960MHz ja 1.71–2.69 GHz vähintään 30 % hyötysuhteella. Vastaavasti muiden antennien taajuuskaistat ovat 1.575 GHz, 2.4 GHz ja 5 GHz tavoitehyötysuhteen ollessa 40 %. Tutkimus suoritetaan sähkömagneettisilla simulaatioilla. Työssä käytettävä puhelimen simulointimalli on paljon realistisempi kuin aiemmissa tutkimuksissa käytetyt mallit. Simuloinnit keskittyvät antennirakenteisiin sekä niiden sijainteihin, kokoihin ja syöttötapoihin. Lisäksi jokaiselle antennille suunnitellaan sovituspiiri. Metallikuoren vaikutusta tutkitaan useilla eri testeillä, joista jokainen keskittyy yhteen parametriin kuten antennin mittoihin, sijaintiin tai syöttöön. Työ aloitetaan yksinkertaisella simulointimallilla, ja näiden testien perusteella valitaan puhelinantennirakenne. Lopulliset testit ja antennien optimointi tehdään tarkalla mallilla. Esitetty rakenne koostuu kolmesta lähekkäin olevasta ja voimakkaasti kytkevästä antennielementistä. Puhelinantennit sijaitsevat laitteen eri päissä ja ovat osa puhelimen sivuissa olevaa metallirengasta. GPS- sekä Wi-Fi-antennit ovat myös osa metallirengasta ja sijaitsevat laitteen päätyjen väliin jäävällä alueella. Suurin metallikuoresta aiheutuva haaste on riittävän hyvän ja laajakaistaisen sovitustason saavuttaminen. Vaikeasta ympäristöstä huolimatta suunnitellut antennit täyttävät asetetut suorituskykytavoitteet. Tulosten perusteella on mahdollista suunnitella hyvin toimivat antennit metallikuoriseen puhelimeen

Low correlation multiple antenna system for mobile phone applications using novel decoupling slots in ground plane

A compact low profile multiple antenna system for multiple-input-multiple- output (MIMO) applications is proposed. The antenna system combines two monopole type printed antennas with a slotted ground plane for low correlation and high isolation characteristics. The main antenna covers the twelve wireless communication bands required for LTE, GSM, UMTS2110, Bluetooth, WiMAX and WLAN. The auxiliary antenna has a very small volume compared to the main one and covers the ultra-wideband (UWB) frequency range (3.74-12 GHz). The antennas are positioned at opposite ends of the system's ground in order to reduce the mutual coupling between them. The isolation maintained is better than 20 dB over the desired frequency bands, resulting in an envelope correlation coefficient of less than 0.08. The simulation results show good S-parameters, high gain and radiation efficiency, and relatively stable radiation patterns. Due to the compact size and the ultrawide bandwidth, the proposed multiple antenna system is suitable for communication handsets that have size limitations. Results are presented and discussed. © 2013 IEEE

Mimo antenna system for modern 5g handheld devices with healthcare and high rate delivery

In this work, a new prototype of the eight-element MIMO antenna system for 5G communications, internet of things, and networks has been proposed. This system is based on an H-shaped monopole antenna system that offers 200 MHz bandwidth ranges between 3.4-3.6 GHz, and the isolation between any two elements is well below -12 dB without using any decoupling structure. The proposed system is designed on a commercially available 0.8 mm-thick FR4 substrate. One side of the chassis is used to place the radiating elements, while the copper from the other side is being removed to avoid short-circuiting with other components and devices. This also enables space for other systems, sub-systems, and components. A prototype is fabricated and excellent agreement is observed between the experimental and the computed results. It was found that ECC is 0.2 for any two radiating elements which is consistent with the desirable standards, and channel capacity is 38 bps/Hz which is 2.9 times higher than 4 x 4 MIMO configuration. In addition, single hand mode and dual hand mode analysis are conducted to understand the operation of the system under such operations and to identify losses and/or changes in the key performance parameters. Based on the results, the proposed antenna system will find its applications in modern 5G handheld devices and internet of things with healthcare and high rate delivery. Besides that, its design simplicity will make it applicable for mass production to be used in industrial demands