Design optimization of chip antennas using the GA-FDTD approach

Abstract

A popular chip antenna is designed with certain metal patterns on a small bulk made of ceramic or similar material. For the purpose of designing this kind of chip antenna for small wireless-mobile terminals, this article proposes a method in which a genetic algorithm (GA) is adopted to optimize the realized antennas' matching conditions. A model of a meander-line-based chip antenna is established to fit the GA; meanwhile, an FDTD-based simulation package is employed to calculate the input impedances and radiation patterns of tested cases during the GA process. The computation package used in this work is proved to be capable of predicting the performance of the fabricated antennas; on the other hand, the GA shows that it can lead to a convergent result impedance-matching improvement. It is well verified that this type of antenna may have omnidirectional radiation patterns on the principal plane, similar to those of the usual monopole antennas. A capacitive feeding technique for the obvious improvement of the prototype antenna's impedance is also presented. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 15: 116 -127, 2005.

Designing a chip antenna with dual‐band by a material‐loading technique

“…The size of the ground plane is 8 × 6 cm 2 . It should be mentioned that this work is based on the design [1], in which the general algorithm (GA)‐finite difference time domain (FDTD) [7, 8] approach was applied to search for optimal matching condition due to a certain meander line layout. The FDTD‐based package, FIDELITY [9], is used in this design.…”

“…Chip antennas have been developed rapidly for mobile phone in the recent years [1–3]. The design concept of the chip antenna is based on the material‐loaded monopole.…”

A novel textile antenna using composite multifilament conductive threads for smart clothing applications

“…With the increasing usage of smart clothing applications, reliability requirements for wireless communication have become more critical. Conventionally, the Bluetooth/WiFi modules of smart clothing applications use either on‐chip antennas or printed‐circuit‐board (PCB) antennas to transmit the fitness data. However, these types of antennas result in lower reliability due to two limitations.…”

A Building-Block Favoring Method for the Topology Optimization of Internal Antenna Design

“…After that, topology optimization was implemented for antenna design problems [9]; it especially has gained much attention in the design of patch antennas [10][11][12][13][14][15][16][17][18][19][20][21][22] and monopole antennas [22][23][24][25][26][27][28]. However, only few studies have been done on other types of antennas such as chip antennas [29], planar-inverted-F antennas [30], handset antennas [31], and mobile antennas [32] using topology optimization. Furthermore, there has been far less research on the characterization of problem difficulty for topology optimization.…”