# IEEE Transactions on Antennas and Propagation

## Volume 64 Issue 7  Part 1 • July 2016

This issue contains several parts.Go to:  Part 2

## Filter Results

Displaying Results 1 - 23 of 23

Publication Year: 2016, Page(s):C1 - 2589
| PDF (250 KB)
• ### IEEE Transactions on Antennas and Propagation

Publication Year: 2016, Page(s): C2
| PDF (90 KB)
• ### Guest Editorial Theory and Applications of Characteristic Modes

Publication Year: 2016, Page(s):2590 - 2594
Cited by:  Papers (6)
| PDF (803 KB) | HTML
• ### Computational Analysis and Verifications of Characteristic Modes in Real Materials

Publication Year: 2016, Page(s):2595 - 2607
Cited by:  Papers (24)
| | PDF (2969 KB) | HTML

Despite its long history, the theory of characteristic modes (TCMs) has only been utilized in antenna design for perfect electric conductors (PECs). This is due to computational problems associated with dielectric and magnetic materials. In particular, the symmetric form of the Poggio-Miller-Chan-Harrington-Wu-Tsai (PMCHWT) surface formulation for the method of moments (MoM) solves for both extern... View full abstract»

• ### Large-Scale Characteristic Mode Analysis With Fast Multipole Algorithms

Publication Year: 2016, Page(s):2608 - 2616
Cited by:  Papers (9)
| | PDF (2582 KB) | HTML

Large-scale characteristic mode analysis (CMA) poses challenges in computational electromagnetics as it calls for efficient solutions of large dense generalized eigenvalue problems. In this paper, we consider two applications that involve large-scale CMA, and demonstrate that fast multipole algorithms (FMAs) can be easily incorporated into the implicitly restarted Arnoldi method (IRAM) for eigenan... View full abstract»

• ### Eigenvalue Crossing Avoidance in Characteristic Modes

Publication Year: 2016, Page(s):2617 - 2627
Cited by:  Papers (13)
| | PDF (1960 KB) | HTML

The theory of characteristic modes (TCM) provides a set of eigenvalues and eigenvectors that are determined entirely by a structure's geometry at a particular frequency. When examining a design over a range of frequencies, consistent interpretation of the modal data is crucial. Here, we present a way of interpreting crossing avoidances observed when tracking characteristic-mode eigenvalue traces o... View full abstract»

• ### Advanced Eigenvalue Tracking of Characteristic Modes

Publication Year: 2016, Page(s):2628 - 2636
Cited by:  Papers (9)
| | PDF (3294 KB) | HTML

Eigenvalue tracking is a serious issue in the calculation of characteristic modes over a wide frequency range. Two commonly used algorithms in this regard are investigated and the drawbacks that typically occur during eigenvalue tracking are explained. We discuss the effect of the degraded modes in detail. A new algorithm is presented that overcomes these drawbacks in an innovative way. The new al... View full abstract»

• ### Computation of the$Q$Limits for Arbitrary-Shaped Antennas Using Characteristic Modes

Publication Year: 2016, Page(s):2637 - 2647
Cited by:  Papers (8)
| | PDF (3569 KB) | HTML

In this paper, we present an efficient and direct method for computing the lower bound on Q for arbitrary-shaped, perfectly conducting antenna geometries. We begin by deriving a new formula for Q based on the currents induced on the antenna/scatterer and the method of moments (MoM) impedance matrix [Z]. We then use this formula in conjunction with the theory of characteristic modes to find lower b... View full abstract»

• ### Bandwidth Enhancement of Platform-Mounted HF Antennas Using the Characteristic Mode Theory

Publication Year: 2016, Page(s):2648 - 2659
Cited by:  Papers (21)
| | PDF (8141 KB) | HTML

Many high-frequency (HF) antennas have significantly smaller dimensions than the wavelength at which they operate and thus suffer from narrow bandwidths. In many military applications, such HF antennas are mounted on relatively large metallic platforms. In this paper, we examine how a platform-mounted antenna can be used to excite the characteristic modes (CMs) of the platform itself to increase t... View full abstract»

• ### MIMO Mobile Handset Antenna Merging Characteristic Modes for Increased Bandwidth

Publication Year: 2016, Page(s):2660 - 2667
Cited by:  Papers (22)
| | PDF (3696 KB) | HTML

The behavior of a mobile handset chassis-mode antenna with a metal bezel is analyzed in this paper by utilizing the theory of characteristic modes (TCM). Two eigenmodes, one from the chassis (0.5λ-dipole mode) and the other one from the bezel (1λ-perimeter mode), are merged by a monopole exciter to broaden the antenna bandwidth below 1 GHz. A new eigenmode from the bezel (1.5λ-perimeter mode) is a... View full abstract»

• ### Systematic Shape Optimization of Symmetric MIMO Antennas Using Characteristic Modes

Publication Year: 2016, Page(s):2668 - 2678
Cited by:  Papers (20)
| | PDF (1747 KB) | HTML

We introduce a systematic approach to the shape optimization of compact, single-aperture MIMO antennas. Because the characteristic modes of a radiator represent its complete set of possible responses to an excitation, any port on the antenna must display the properties of a combination of one or more of these characteristic modes. By restricting our consideration to a class of symmetric antennas, ... View full abstract»

• ### Design of a Wideband, Tunable Four-Port MIMO Antenna System With High Isolation Based on the Theory of Characteristic Modes

Publication Year: 2016, Page(s):2679 - 2688
Cited by:  Papers (14)
| | PDF (5826 KB) | HTML

Cognitive radio (CR) systems, which are intended for opportunistic spectrum access over a large portion of the mobile radio spectrum, require highly isolated and wideband multiport antennas. The subject of this paper is an approach for mapping characteristic modes (CMs) to radiation modes (RMs) to build a multiple-input multiple-output (MIMO) antenna system meeting the requirements of isolation an... View full abstract»

• ### Compact Multimode Multielement Antenna for Indoor UWB Massive MIMO

Publication Year: 2016, Page(s):2689 - 2697
Cited by:  Papers (28)
| | PDF (7434 KB) | HTML

In this paper, we present a concept for a compact ultra-wideband multielement antenna (MEA) for massive MIMO indoor base stations. The antenna concept is based on the simultaneous excitation of different characteristic modes on each element of the MEA. This enables an effective 484 port antenna using only 121 physical antenna elements. Thereby, a size reduction of 54% compared to a generic MEA bas... View full abstract»

• ### Null-Steering Antenna Design Using Phase-Shifted Characteristic Modes

Publication Year: 2016, Page(s):2698 - 2706
Cited by:  Papers (15)
| | PDF (3302 KB) | HTML

A novel low-cost null-steering antenna operating at 2.45 GHz is designed by exploiting an asymmetric excitation of two characteristic modes. This compact antenna allows a null shift of the radiation pattern by changing the relative phase between the two capacitive exciters (CCEs) located above the conductive plane. As a proof of concept, a prototype of the radiator has been realized by resorting t... View full abstract»

• ### Computing and Visualizing the Input Parameters of Arbitrary Planar Antennas via Eigenfunctions

Publication Year: 2016, Page(s):2707 - 2718
Cited by:  Papers (7)
| | PDF (5655 KB) | HTML

We propose a method for modeling planar multiport antennas of arbitrary shape using characteristic mode theory (CMT) without physically including the feeds. The characteristic modes of the feed-free structure are expanded to form a basis for the eigenfields, and a virtual probe is introduced to excite the antenna. We develop a broadband multiport circuit model for the antenna impedance based on th... View full abstract»

• ### Analysis of Miniature Metamaterial and Magnetodielectric Arbitrary-Shaped Patch Antennas Using Characteristic Modes: Evaluation of the$Q$Factor

Publication Year: 2016, Page(s):2719 - 2731
Cited by:  Papers (3)
| | PDF (4047 KB) | HTML

Evaluating the Q factor of antennas using metamaterial substrates is a challenge and requires new analysis techniques. This challenge is even more important for arbitrary-shaped antennas. In this paper, we address the problem of analysis and evaluation of metamaterial-based antennas through the use of characteristic modes. We propose a new expression for the total Q factor, which is independent of... View full abstract»

• ### Reduction in Out-of-Band Antenna Coupling Using Characteristic Mode Analysis

Publication Year: 2016, Page(s):2732 - 2742
Cited by:  Papers (11)
| | PDF (2978 KB) | HTML

Out-of-band interference by antenna coupling is frequently encountered and difficult to compensate. In this paper, it is studied for the first time using characteristic mode analysis (CMA). Mutual coupling between two antennas is separated into several fundamental modes, and the contribution of each mode is evaluated through modal mutual admittance (MMA). Some higher order modes, which contribute ... View full abstract»

• ### Electromagnetic Resonances of Individual Single-Walled Carbon Nanotubes With Realistic Shapes: A Characteristic Modes Approach

Publication Year: 2016, Page(s):2743 - 2757
Cited by:  Papers (5)
| | PDF (3081 KB) | HTML

In composites, carbon nanotubes (CNTs) are rarely perfectly straight and they usually exhibit complex shapes. In this paper, we employ the method-of-moments formulation for arbitrary thin wires to study the electromagnetic scattering characteristics of CNTs with realistic shapes. More than 800 different CNT shapes were simulated in this work. These shapes were generated using a coarse-grained mole... View full abstract»

• ### Characteristic Mode Analysis of a Class of Empirical Design Techniques for Probe-Fed, U-Slot Microstrip Patch Antennas

Publication Year: 2016, Page(s):2758 - 2770
Cited by:  Papers (20)
| | PDF (5027 KB) | HTML

In this paper, characteristic mode analysis (CMA) of three empirical design techniques for the probe-fed, symmetrically located, U-slot microstrip patch antenna, on a single-layer grounded substrate, is presented with supporting experimental data. The first method, resonant frequency (ResF), utilizes the existence of the four distinct ResFs, while the second one, dimensional invariance (DI), relie... View full abstract»

• ### Introducing IEEE Collabratec

Publication Year: 2016, Page(s): 2771
| PDF (2185 KB)
• ### Member Get-A-Member (MGM) Program

Publication Year: 2016, Page(s): 2772
| PDF (3382 KB)
• ### IEEE Transactions on Antennas and Propagation

Publication Year: 2016, Page(s): C3
| PDF (85 KB)
• ### Institutional Listings

Publication Year: 2016, Page(s): C4
| PDF (474 KB)

## Aims & Scope

IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief                                             Danilo Erricolo