Performance Of Planar inverted-F Antenna Research Articles

A Shared-Aperture Antenna for (3.5, 28) GHz Terminals With End-Fire and Broadside Steerable Beams in Millimeter Wave Band

In this paper, a concept of partial structure reuse is presented and on this basis a 3.5/28 GHz shared-aperture antenna supporting two-dimensional (end-fire and broadside) steerable beams in MMW band is developed. The antenna consists of a 3.5 GHz planar inverted-F antenna (PIFA) and two 1×6 28 GHz substrate integrated DRA (SIDRA) beam-steerable arrays, in which partial structures of the PIFA are reused by the two MMW arrays. To improve the performance of PIFA, two narrow slots and one lumped capacitor are introduced to reduce its H-plane cross-polarization and enhance the operating bandwidth, respectively. To verify the design, antenna prototypes were fabricated and measured. Measured results show that the antenna can cover a dual-band of 3.28-3.67 GHz (11.2%), 26-29.7 GHz (13.2%) for end-fire and 25.9-29.7 GHz (13.8%) for broadside. The peak gains of 4.8 dBi, 10 dBi (end-fire) and 10.8 dBi (broadside) are obtained by the MW element and two 1×4 MMW arrays, respectively. Each of the MMW arrays can steer the beams from -50° to +50°, covering different parts of the space. The shared-aperture antenna has a compact size of 0.45×0.3×0.03 λ01 3 (λ01 is the free-space wavelength at 3.5 GHz), making it suitable for terminal applications.

Planar Inverted F Antenna, PIFA Array in 5G applications

Planar inverted F antenna (PIFA) is mainly fit for mobile devices. PIFA is mostly designed for dual band frequencies as it is capable of covering wide range of wireless services. This in turn helps in making it acceptable for designing mobile devices. Sizes of ground plane as well as PIFA’s position with respect to ground plane actually effect the performance of PIFA. For example, placement of PIFA at corner of ground plane shows good radiation pattern. Major prerequisite of 5G is nothing but the capability to enhance data volume to every single user, while supporting majority of mobile users as well as new maneuvers. The best part is advanced antenna array technologies are able to meet such requirements. Although PIFA antenna has gained popularity in designing mobile handsets, because of light weight, lower cost as well as higher directivity, PIFA antenna Arrays have been proved to be strong foundation for future 5G Mobile Communication Systems as PIFA Arrays provide better gain than single PIFA antenna in same frequency band. Current work presents a comprehensive study on so far impact of PIFA as well as PIFA Array in providing infrastructure for future mobile innovations suitable for 5G communication.

Dual‐band frequency‐reconfigurable MIMO PIFA for LTE applications in mobile hand‐held devices

In this study, dual-port dual-frequency tuneable MIMO planar inverted-F antenna (PIFA) is presented for mobile handheld device applications. The proposed MIMO antenna consists of two symmetrical PIFAs with the centre-to-centre distance of 43.0 mm (0.1906λ 0 ). The dual-band tunability is achieved by changing the capacitance (V 1 and V 2 ) of 4.15 pF (0 V)-0.72 pF (15 V). The impedance bandwidth of -6 dB is realised from 0.8 to 0.98 GHz for the lower band and 1.65 to 2.2 GHz for the higher band. The proposed antenna provides the independent frequency tunability without disturbing the frequency bands. It shows the good isolation for both the tuneable bands >20 dB without using any coupling element between the antenna structure. It has a peak realised gain of 3.44 dBi, good efficiency of > 75% and envelope correlation coefficient of 0.007. In addition, the proposed PIFA performance is analysed with total active reflection coefficient, channel capacity, diversity gain, multiplexing efficiency, mean effective gain and specific absorption ratio for the tuneable range of frequencies. The good agreement is obtained between simulation and experimental performances to validate the antenna parameters.

Improvement of radiation performance of mobile phone antenna using parasitic element

In this paper, we propose a method of using a parasitic element to improve the radio frequency performance of PIFA (Planar Inverted F Antenna) which is built in mobile phone for EGSM, DCS, PCS, and WCDMA bands. The proposed methodology based on external parasitic element in the handset case is validated for extremely thin mobile phone model, which has limited space for any additional parasitic element inside antenna design space. The proposed parasitic element exhibits TRP (Total Radiated Power) and TIS (Total Isotropic Sensitivity) improvement of 0.4 dB to1.1 dB and 0.2 dB to 0.6 dB, respectively, under the free space measurement condition, while 0.6 dB to 0.7 dB and 0.4 dB to 1.1 dB for the hand phantom environment.

U-형 접지면 상에 배치된 평판형 역 F 안테나 구조를 이용한 휴대폰 단말기의 무선 성능 개선

본 논문에서는 GSM, DCS, PCS, WCDMA 대역을 지원하는 휴대폰 단말기의 무선 성능을 개선시키기 위한 PIFA(Planar Inverted-F Antenna) 구조와 접지면의 형태에 대해 연구하였다. 다중 공진을 유도하기 위해 안테나 방사체를 다수의 전류 경로를 가진 가지 구조로 설계한 후에 특정 방사체 아래쪽에 방사체와 유사한 모양의 접지면을 배치함으로써 안테나의 공진 특성과 방사 효율을 개선시켜 휴대폰 단말기의 무선 성능을 개선할 수 있는 설계 방법에 대해 제안한다. 실제 휴대폰 단말기를 통해 제안된 안테나와 접지면 구조에 대한 무선 성능을 측정한 결과, 적용 이전에 비해 GSM 대역의 TRP(Total Radiated Power)는 2.0 dB, TIS(Total Isotropic Sensitivity)는 3.7 dB 향상되었으며, DCS 대역 TRP와 TIS는 각각 2.2 dB, 2.0 dB가 향상되는 결과를 얻었다. 또한 PCS 대역 TRP, TIS는 0.8 dB, 1.5 dB 향상되었으며, WCDMA 대역 TRP, TIS는 1.3 dB, 0.7 dB 향상되었다. In this paper, we propose antenna topology and ground plane shape to improve the performance of PIFA (Planar Inverted F Antenna) which is built-in mobile phone. First, we designed the PIFA antenna consists of multiple radiators to provide multi-current paths. Then we designed U-shaped ground plane on the PCB under the antenna. The proposed antenna structure shows TRP/TIS improvement of 2.0 dB/3.7 dB for GSM and 2.2 dB/ 2.0 dB for DCS and 0.8 dB/1.5 dB for PCS and 1.3 dB/0.7 dB for WCDMA at the free space.

Whip–PIFA combination for handset application: A hybrid circuit model and full‐wave analysis

AbstractIn this paper, a circuit model is developed in RF ADS in order to simulate the coupling effect of a retracted whip on a planar inverted‐F antenna (PIFA) for wireless‐handset application. The PIFA is designed as the main antenna of the handset to cover the 800‐MHz (824–894 MHz) and 1900‐MHz (1850–1990 MHz) bands. A parasitic whip antenna is used to improve the performance of the PIFA, especially when the handset is used against the human head. In such a whip–PIFA combination environment, the retracted whip will degrade the PIFA performance if it is not designed carefully. The purpose of this paper is to present an efficient method to optimize the PIFA performance when the whip antenna is in the retracted position. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 210–215, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20590

Ground plane effects on planar inverted-F antenna (PIFA) performance

The planar inverted-F antenna (PIFA) is popular for portable wireless devices because of its compact size and low profile. The PIFA is designed to operate with a ground plane and the ground plane is an integral part of the antenna assembly. In fact, the ground plane size is the limiting factor for the PIFA in many applications. Some work has been reported on the performance of PIFAs mounted on a conducting box of fixed size; however, what is lacking is a parametric study on the antenna behaviour as a function of geometry or antenna position and orientation on a finite ground plane. The paper presents results from a comprehensive investigation on the performance of a conventional PIFA mounted on ground planes of various sizes and shapes. The orientation and position of the antenna on a fixed-size ground plane is analysed. The influence of ground plane geometry on resonant frequency, bandwidth, gain, and radiation patterns are presented. These results are very useful in the design of a PIFA for applications requiring a small ground plane. Specifically, the results show the trade-offs between PIFA geometry and ground plane size with electrical performance. Both numerical simulation and experimental data are presented.