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Special Integration Approach Between Multiple AntennasAllowing Lower Correlation-Coefficient for Handheld Devicesin MIMO System

IP.com Disclosure Number: IPCOM000236584D
Original Publication Date: 2014-May-05
Included in the Prior Art Database: 2014-May-05
Document File: 7 page(s) / 4M

Publishing Venue

Motorola

Related People

Shachar, Aviv: INVENTOR [+4]

Abstract

The bulk of this article presents a novel for unique antenna configuration and integration for seamless operating modes between LTE(13/14) and EV-DO networks . This innovation has been implemented on LEX-700 (Teton) which includes certain RF architecture of three WWAN ports. Those antennas Tapered-IFA, Asymmetric-FICA and Folded-IFA required supporting special performance across the entire bands: bandwidth, radiation efficiency and correlation-coefficient inside bounded physical area and minimized volume. This concept considers as a breakthrough for state of the art per devices like Handhelds, PDAs and Smart-phones particularly for LTE. Besides, this article presents some innovations on key features of an antenna implementation 2X2 MIMO for LTE. Hopefully this concept will implement on future products as well. LEX700 (Teton) considers as a pioneer device at Private-LTE system. Glossary: FICA - Folded Inverted Conformal Antennae; IFA - Inverted F Antennae; LTE(13/14) - Long Term Evolution (band 13/14); EV-DO - Evolution-Data Optimized; MIMO - Multiple Input Multiple Output;WWAN -World Wide Area Network.

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Special Integration Approach between Multiple Antennas Allowing Lower Correlation-Coefficient for Handheld Devices in MIMO System

By Aviv Shachar, Antonio Faraone, Giorgi Bit-Babik, Shimon Barness

Motorola Solutions, Inc.

 

ABSTRACT

The bulk of this article presents a novel for unique antenna configuration and integration in seamless operating modes between LTE(13/14) and EV-DO networks .  This innovation has been implemented on LEX-700 (Teton) which includes certain RF architecture of three WWAN ports. Those antennas Tapered-IFA, Asymmetric-FICA and Folded-IFA supporting a special performance across the entire bands bandwidth, radiation efficiency and correlation-coefficient inside bounded and minimized physical area and volume. This concept considers as a breakthrough for state of the art per devices like Handhelds, PDAs and Smart-phones particularly for LTE. Besides, this article presents some innovations on key features of an antenna implementation 2X2 MIMO for LTE. LEX700 (Teton) considers as a pioneer device at Private-LTE system.

Glossary: FICA – Folded Inverted Conformal Antennae; IFA – Inverted F Antennae; LTE(13/14) – Long Term Evolution (band 13/14); EV-DO – Evolution-Data Optimized; MIMO – Multiple Input Multiple Output;WWAN –World Wide Area Network.

PROBLEM

Since the LTE based on multiple-antenna technologies such as MIMO. Hence, the portable form factor becomes a bottleneck. On the one hand an industrial designers looking forward on small products. On the other hand, the challenges for antenna designers actually become an impossible mission to compactness the antenna area/volume that needs to keep on correlation-coefficient, radiation performance and isolation as well. Therefore, they are looking for a new approaching of compactness techniques for antenna.

SOLUTION

Following step by step

Step1

The method of achieving lower correlation-coefficient in a portable radio comprising:

·        Use of a 2 x 2 MIMO configuration operating in the LTE band 13/14 spectrum;

·        Use of a tapered-slot feeding to increase or adjust bandwidth;

·        Using a Tapered-IFA and Asymmetric-FICA in a minimal area configuration.

·        Tapered-slot within Asymmetric-FICA cause to bandwidth enhancement by different surface current paths as shown in figure 9 (see red lines).

Step 2

The method of step 1 where the 2x2 MIMO configurations is a switched matrix of at least three antennas within the portable radio where:

·        The antennas are designed for use in a WWAN configuration for LTE band 13 and band 14 and;

·        The antennas are designed as part of an EVDO-BC0 configuration such that the ground plane is implemented with microwave considerations.

Step 3

The method of step 1 where the ground plane configurations are limited to (x,y)=(λ/6, λ/4).

Step 4

The method of step 1 where specific microwave dimensions demonstrated per feeding points as mentioned in the antenna concept (ant#1, ant#2, ant#3) = (λ/25, λ/25, λ/14) as shown in figure 4.

Step 5

The method o...