Ku-band Communication Research Articles

MULTI BAND MICRO STRIP PATCH ANTENNA FOR WIRELESS APPLICATIONS

This research paper aims to design a new shape of the microstrip patch antenna. Combining a half circular and zigzag shape of a triangular patch antenna, we selected two different shapes of microstrip patch to obtained modern shape no one mentioned it before and it’s seems like a tulip rose, so this design achieved to works for multiband. The dimensions of the proposed antenna are (38×30×1.6) mm3 applied on the dielectric substrate FR-4, which has a relative dielectric constant of (εr=4.3) and loss tangent (tanδ=0.002). Both patch and ground are copper material with a thickness (t=0.035 mm). So four-band are achieved (5.1612-5.3874) GHz, (8.8729-10.067) GHz, (10.476-11.091) GHz, and (13.819-30) GHz. The return loss (S11) are (-20.784) dB, (-30.532) dB, (-19.246) dB and (-29.789) dB respectively. The antenna is printed by using FR-4 substrate and simulated by CST-Microwave studio software. This antenna works for various wireless applications such as Wi-FI, C band, X band, Ku band, Ka-band, cellular phones, and satellite communications.

Ku대역과 밀리미터 대역의 광대역 무선통신 시스템을 위한 소형 슬롯 6각 구조의 패치 안테나

본 논문에서는 초광대역의 소형 슬롯 6각 구조의 패치 안테나가 12×9×0.787 ㎣ (1.64λ×1.23λ×0.107λ)로 설계되었다. 본 논문에서는 위성통신과 66.67%의 중심 주파수 비 대역폭을 가지는 미래 ㎜-Wave 어플리케이션을 위해 (30 ~ 52) ㎓의 대역보다 더 넓은 초광대역 통신을 위해 슬롯 6각 구조의 ground plane이 Ku대역 주파수(17.608 ~ 19.64) ㎓에서 동작되도록 제시했다. 안테나는 37 ㎓의 ㎜-Wave 주파수 대역을 포함하여 다양한 주파수에서 공진한다. 제안된 안테나의 최대 이득은 6.282 ㏈이다.

A Compact Dual Notch Frequency Reconfigurable Antenna for WIMAX,DSRC, RADAR and Ku band Communication Applications

A frequency reconfigurable ultra-wide band antenna with dual notch bands is proposed in this paper. PIN diodes are located on ultra-wide band monopole antenna and are investigated for frequency reconfigurable characteristic of the proposed antenna. Multi-bands and narrow bands have been achieved by different combinations. Proposed antenna is fabricated on FR-4 substrate of dimensions 37 x 40 x 0.8mm3. For the successful combinations, antenna performance parameters like S11 characteristics, surface current distribution, peak gain, radiation efficiency and 2D radiation patterns are analyzed and illustrated in the paper. Peak gain of 4.83dB is obtained in operating band for D1, D2= 0, 1 combination. Radiation efficiency is not less than 70% in the entire operating bands. Results are analyzed experimentally for validating proposed antenna. Simulation based results and measured results are in good agreement.

Design and analysis of a dual-polarization multiband oval ring patch antenna with L-stubs and folded meander line for C-band/X-band/ Ku-band/ K-band communications

ABSTRACT In this paper, a multiband oval ring patch antenna is presented. The proposed antenna consists of a quarter wavelength folded meander line attached inside the ring and a pair of quarter wavelength ‘L’ shaped stubs are attached outside the ring which helps antenna in radiating at multiple resonant frequencies with proper impedance matching performance. Antenna with the dimensions of 10 × 12 × 1.524 mm3 has been designed, fabricated and tested. The proposed antenna exhibits −10 dB impedance at the centre frequency of 6.21 GHz(315 MHz), 9.4 GHz(671 MHz), 16.78 GHz(441 MHz), and 25 GHz(3.21 GHz) from the experimental results. It covers a wide variety of wireless applications namely C-band communications (4 GHz-8 GHz), X-band communications (8 GHz-10 GHz), Ku-band communications (16 GHz-17 GHz), and K-band communications (24 GHz-27.3 GHz). The proposed antenna exhibits gains of 1.01 dBi, 1.2 dBi, 5.6dBic and 8.1 dBi along with the efficiencies of 60.14%, 74.3%, 78.6% and 83.64% at 6.21 GHz, 9.42 GHz, 16.78 GHz, and 25.4 GHz respectively. The patch exhibits Right Hand Circular Polarisation (RHCP) at 16.78 GHz and linear polarisation at remaining resonant frequencies. The measured and simulated results are in good agreement.

An improved wideband three‐way waveguide power divider based on directional coupler for Ku band application

In this paper, a directional-coupler-based wideband three-way waveguide power divider is demonstrated. The proposed power divider consists of tapered rectangular waveguide, six-port directional coupler and iron pentacar-bonyl terminations. Its fractional bandwidth is 10.99% at 12.9 to 14.4 GHz. In addition, the return loss of all input and output ports is better than 20 dB and the isolation of the three output ports is more than 20 dB. Moreover, the insert loss is better than 5.19 dB including the power division ratio of 4.8 dB and the amplitude imbalance among the three output ports of less than ±0.4 dB. The experimental results agree well with the simulation ones, which indicates the validity of our method. With the above-mentioned characteristics, the proposed device can be widely used in Ku band communication systems.

GNSS augmentation through Ku-band communication satellites with RTK realization

In this study, a method to broadcast real-time kinematics (RTK) corrections over a communication satellite is proposed. RTK corrections generated by the reference station are uplinked to the communication satellite within a multiplexed DVB-S carrier. Corrections are received by a satellite dish and the DVB-S satellite receiver. Better than 18 cm of accuracy is achieved for rover distances of up to 500 km in Turkey. The proposed method can be used as an alternative satellite-based augmentation system for Turkey and other countries.

Linearly Polarized Microstrip Planar Filtenna for X and Ku Band Communication Systems

Objective: Design and analysis of a Planar filtenna to operate in X and Ku band communication systems. Methods/Analysis: The design of the filter consisting of planar metallic structure on the top side and a defected ground type structure on another side of the substrate. A substrate material is integrated with vias at the bottom part of the designed structure. The simulation results of the designed filtenna are carried with commercial electromagnetic tool HFSS and all the filtenna radiation characteristics are presented in this work. Findings: A substrate integrated waveguide filter is used in this model for RF channel selection as well as a balun. The proposed filtenna occupies a compact dimension of 12x35.5x1.6 mm. Novelty/Improvement: Planar structures with substrate integrated vias are acting as electromagnetic band gap structures in the current design. The surface wave related losses will be suppressed with this novel structure. Microstrip line feeding with 50 ohm impedance and easy integration are making this model suitable for multiband communication applications.

Bandwidth Enhanced Antipodal Vivaldi Antenna for Wide Band Communication Applications

Objectives: To design high bandwidth and high gain compact antipodal Vivaldi antenna which can be applied for modern communication systems especially for military communication systems. Methods/Analysis: Antipodal Vivaldi antenna is designed with flared elements on both sides of the substrate. Top side patch element is oriented towards left side and bottom side defected ground structured element is oriented towards right side. Finite element method based HFSS-15 is used in the design and simulation. The simulated EM-Results of the return loss, VSWR, radiation patterns and field distributions are analyzed and optimized antipodal vivaldi antenna is designed with parametric analysis. Fire resistance PCB substrate material with dielectric constant 4.4 is used as substrate to prototype the antenna model and measured results are analyzed for validation on ZNB 20 vector network analyzer. Findings: In this work a novel antipodal Vivaldi antenna is designed to operate between L to KU-band communication and applications. The proposed antenna modal consisting of a special type of tapered slot edge structure in the design which enhanced the bandwidth of the antenna. To convert antenna into a wide band model, some modifications are done by placing slotted sections on the ground and patch elements. Antenna is showing 15 GHz huge bandwidth and impedance bandwidth of more than 65%. The proposed antenna is showing VSWR of 2:1 ratio in the operating band and peak realized gain of 7 dB. Omni directional radiation pattern with peak directivity of 5 dB is attained with the current model. Wideband characteristics with considerable gain grouping this antenna in to several communication applications in S, C, X, Ku-bands. Novelty/Improvement: Novelty with respect to defected ground structured flared element and huge bandwidth are advancements in the current design. Both patch and ground structures are designed in a way to enhance the bandwidth as well as gain which is advantageous in communication applications. Field distributions with excellent radiation characteristics are making this model as suitable candidate for future communication systems.

A Monolithic Sub-sampling PLL based 6^|^#x2013;18 GHz Frequency Synthesizer for C, X, Ku Band Communication

A Monolithic Sub-sampling PLL based 6^|^#x2013;18 GHz Frequency Synthesizer for C, X, Ku Band Communication

Design and Development of an Advanced Real-Time Satellite Simulator

An advanced real-time satellite simulator (ARTSS) has been developed to support the ground operations activities of the ETRI satellite control system, such as testing of the system facilities, validation of flight control procedures, verification of satellite commands as well as training of the ground operators. The design of ARTSS is based on the top-down approach and makes use of a modular programming to ensure flexibility in modification and expansion of the system. Graphics-based monitoring and control facilities enhance the satellite simulation environment. The software spacecraft model in ARTSS simulates the characteristics of a geostationary communication satellite using a momentum bias three-axis stabilization control technique. The system can be also interfaced with a hardware payload subsystem such as Ku-band communication transponder to enhance the simulator capability. Therefore, ARTSS is a high fidelity satellite simulation tool that can be used on low-cost desk top computers. In this paper, we describe the design features, the simulation models and the real-time operating functions of the simulator.

The EUTELSAT II satellites: Europe's seeds in communication and TV distribution game

The state-of-the-art satellite EUTELSAT II, developed by Aerospatiale and its industrial partners, is designed to provide Ku-band communication and television distribution services with 16 active channels accessible simultaneously to all users over the whole of Europe. Reconfigurable antenna-feed networks permits zoom operation on all 16 channels offering enhanced EIRP over the central part of Europe for TV distribution purposes. The satellite is designed to be fully operational during eclipse and to be compatible with Ariane IV. High satellite reliability and availability are achieved by the use of 8 12 amplifier ring redundancy during and beyond the 7 year life. The payload design makes use of only two antennas for all communications transmit and receive functions. This resulted in a great simplification of the repeater configuration and provides operational flexibility. The platform is directly derived from the Aerospatiale-MBB Spacebus 100 family (Arabsat heritage). Aerospatiale Telecommunications Programme Office, located in Cannes (France) is the prime contractor of the industrial team, Aeritalia, ATES, CASA, Contraves, Crouzet, ERA, ETCA, MBB, MSS, SEP. First flight model delivery in November 1989 has been a key factor in shaping both technical and management approaches to the programme.

Effects of Data Asymmetry on Shuttle Ku-Band Communications Link Performance

This paper systematically analyzes the signal-signal-to-noise ratio degradations which can potentially occur due to data asymmetry in digital transmission systems. Suitable asymmetry models are developed and error probability performance for various types of data detectors (integrate-and-dump filter, filter-sample detector, and gated-integrate-and-dump filter) is derived. Although this work was done to resolve problems being encountered in the Shuttle Ku -band return link design, specifically for the 50 Mbit/s convolutionally encoded channel (NRZ format), generalizations are made which provide results for other cases of interest (other Ku -band return link channels, or other systems entirely). This paper therefore considers Manchester data formats (in addition to NRZ) and uncoded transmission (in addition to convolutionally coded transmission). The effects of bandlimiting are also considered.