Photonic Antenna Design for Long Term Evolution Application (original) (raw)

Design and Analysis of Photonic Antenna for ROF Communications

Recent advances in technology have stimulated wireless communication systems to move towards higher frequencies such as 5 GHz band for IEEE standard 802.11a and HIPERLAN type 2 (H/2) standards. Considering the practical difficulties such as propagation losses and high feeder in the coaxial cable, Integrated Photonic antenna has attracted most of the wireless system designers. This paper, presents the results of the investigation of broad band active Integrated Photonic antenna consisting of photodiode integrated directly with the microstrip patch radiator. This photonic antenna designed to operate at 5.8GHz within 750MHz frequency band. Antenna structure consists of ‘S’ shaped microstrip patch and its various parameters are analyzed for using it in ROF application. An equivalent circuit model for the photodiode is developed to estimate the input impedance (ZPD) as a function of frequency to assist in the impedance matching between the photodiode and the patch radiator. The main purpose of this study is to increase the effective radiated power of photonic antenna to the level useful for indoor applications. The input impedance Zi of the microstrip patch radiator that depends on feeding point position (df) which provides the highest antenna efficiency within the widest frequency band. The return loss is more than at –10dB level over the entire operating (750 MHz) frequency band. The performance of this photonic antenna in the frequency range 5.8 GHz is studied both theoretically and experimentally.

Technologies and applications of microwave photonic antennas

International Conference on Modern Problems of Radio Engineering, Telecommunications and Computer Science, 2010

This paper describes the development of microwave photonic antennas concepts and their applications. The experimental study of the transmitting and receiving photonic antenna are shown. The transmitting photonic antenna consists of photodiode integrated with microstrip E-shaped patch antenna, and receiving photonic antenna consists of laser diode integrated directly with the Vivaldi antenna.

Compact and wideband transmit opto-antenna for radio frequency over fiber

Optics Express, 2019

An advanced transmit remote opto-antenna unit is proposed that accomplishes impedance matching between a photodetector and a low-profile antenna in a specified frequency bandwidth, without requiring an area-consuming matching network. This results in a highly compact design, which also avoids the losses and spurious radiation by such an electrically large matching circuit. Instead, the photodetector is almost directly connected to the antenna, which is designed as a conjugate load, such that the extracted and radiated power are optimized. The required input impedance for the antenna is obtained by adopting a half-mode air-filled substrate-integrated-waveguide topology, which also exhibits excellent radiation efficiency. The proposed unit omits electrical amplifiers and is, therefore, completely driven by the signal supplied by an optical fiber when deployed in an analog optical link, except for an externally supplied photodetector bias voltage. Such a highly cost-effective, power-efficient and reliable unit is an important step in making innovative wireless communication systems, which deploy extremely dense attocells of 15 cm × 15 cm, technically and economically feasible. As a validation, a prototype, operating in the Unlicensed National Information Infrastructure radio bands (5.15 GHz-5.85 GHz), is constructed and its radiation properties are characterized in free-space conditions. After normalizing with respect to the optical source's slope efficiency, a maximum boresight gain of 12.0 dBi and a −3 dB gain bandwidth of 1020 MHz (18.6 %) are observed.

Radio-over-Fiber System Using Photonic Active Integrated Antennas (PhAIAs

There is much current interest in low-cost radio-over-fibre (RoF) systems for distribution of mobile-phone and WiFi signals within buildings. In such systems the link gain and packaging cost will be critical. This report describes a low cost scheme for implementing in-building distributed antenna systems using the Photonic Active Integrated Antenna (PhAIA) concept, whereby photonic devices are integrated directly with planar antennas. It is an extension to Active-Integrated-Antenna (AIA) concept from microwave engineering field. The fact that the photonic device and antenna are highly integrated means that very efficient impedance matching can be achieved, which can lead to improved link gain. It could also lead to much reduce packaging and fabrication costs.

Ultra-broadband photonic patch antenna

2006

Abstract This paper presents a demonstration an ultra-broadband photonic antenna. The antenna utilizes external optical intensity modulators and optic fiber to photonically remotes the aperture stacked patch antennas and replaces microwave diplexers with simple photonic combination. The resulting photonic antenna is demonstrated to provide a bandwidth of 110% with gain of 7 dBi

Antenna Technology: Past, Present and Future

The evolution of antenna technology is reviewed, from the days of Marconi to the present. Various periods over which antenna technology has been revitalized are reviewed, and the various antenna configurations developed during those periods are summarized along with some of their respective key characteristics. The history starts at the beginning of the 20 th century and the respective technologies developed in the decades that follow are identified. Individuals that played a key role, especially during the early stages of antenna technology, are identified. Future trends and needs are speculated. Key technologies that will contribute to future advancements are identified and will be presented at the conference.

Active photonic antenna for wireless communications at 2.4 GHz

2008

Active photonic antenna (APhA) designed for 2.4 GHz communication in downlink side is proposed. The APhA consists of photodiode, RF amplifier and band pass filter (BPF) in small package, integrated with RF antenna. The APhA design is simulated using optical communication simulation software at varied fiber length and free space loss (FSL). Performance improvement over passive photonic antenna (PPhA) in term of signal power, SNR, constellation diagram, and BER is achieved, especially at PPhA service boundary.

Ultra-broadband Photonic Antenna System with Microwave Photonic Combination

2007

Abstract The bandwidths of two aperture stacked patch antennas have been combined successfully into a single large bandwidth using microwave photonic techniques. The antenna system produces a 10 dB return loss bandwidth of approximately 105% with average gain level of 5 dBi and amplitude variation of plusmn1. 5 dB. Radiation analysis shows the level of interaction of the two antennas according to their relative position.

Optimization of Microstrip Antenna Characteristics Using Photonic Band Gap Structure

T his paper presents a microstrip patch antenna using a photonic band gap (PBG) structure for attaining higher bandwidth. The photonic periodic structure was considered as cross shaped, placed on the ground plane. The simulation results from HFSS Ansoft design showed that surface waves can be suppressed by the periodic structure due to the influence of its forbidden band. As a result, the bandwidth of the proposed antenna was 6.7% higher than the conventional antenna. Moreover, the values of gain and directivity of antenna were more by adding PBG in comparison with the values of the antenna alone.

Radio-over-fibre distribution using an optical D-fibre antenna

Optics & Laser Technology, 2001

Finite element analysis has been used to characterise an all-ÿbre antenna using circular core D-ÿbre. The optical D-ÿbre carrying a transversely poled piezoelectric polyvinylidene uoride polymer coating was modelled by using three-dimensional stress analysis. The response of the D-ÿbre antenna was determined over a wide frequency range from 1 to 800 MHz. The modelling predicts that the electric-ÿeld-induced strains will cause a phase shift of 2:43×10 −5 rad=(V=m) per metre at 5 MHz. At frequencies higher than 8 MHz, the optical response is dominated by radial resonances of the D-ÿbre=coating composite. Using the simulation results, an electric-ÿeld-induced phase shift of 7:35×10 −5 rad=(V=m) per metre has been obtained. An increase in phase modulation sensitivity by a factor of three compared to conventional circular ÿbre has been achieved by utilising the unique properties of the D-ÿbre structure. The D-ÿbre antenna has potential applications in areas such as EMC testing and radio-over-ÿbre networks where it provides a convenient means of optically generating radio signals.