scholarly journals BROADBAND MICROWAVE VIVALDI ANTENNA USING COPLANAR FEED LINE

2019 ◽  
pp. 13-19
Author(s):  
Alexander A. Golovkov ◽  
Polina V. Terenteva ◽  
Alexander G. Zhuravlev ◽  
Michail S. Shmyrin ◽  
Nikolay S. Stenyukov
Keyword(s):  
Antenna Arrays ◽  
Dielectric Substrate ◽  
High Gain ◽  
Wide Frequency Range ◽  
Field Structure ◽  
Slot Antenna ◽  
Manufacturing Cost ◽  
Frequency Range ◽  
Coplanar Line ◽  
Vivaldi Antennas

Nowadays Vivaldi antennas are used as directional emitters with matching and balancing device at the input. As a rule, these devices cause additional losses in case of broadband operation. Besides, the use of the device leads to radiator pattern distortions, especially when operating in a wide frequency range. Stringent operating requirements (wide operating temperature, high humidity, salt fog, vibration, etc.), make the choice of proper chip very complicated. The aim of the study is to develop a slot antenna with a 50-ohm port at the input, which would be easy to manufacture and operate, while maintaining high gain in a wide frequency range. As is known, the field structure in the coplanar line is close to the field structure in the slit field close to it. As is known, the field structure in the coplanar line is similar to the field structure in the slot line. Using mathematics for such fields, means of electrodynamic modeling and numerical calculation, a system is developed that consists of two Vivaldi antennas fed by one coplanar line. Thus, the emitter has a close to a circular pattern and low losses in the structure of feeding, matching and balancing, the functions of which are performed by the coplanar line. The results are given for the frequency range of 1-6 GHz. The device as a whole is a dielectric substrate with radiating structure made as double-sided metallization. Finline-based emitters are acceptable to use for operation in higher frequencies. Antenna has low manufacturing cost and it is easy to repeat. Currently the authors are continuing work on the study of the use of such elements as part of antenna arrays.

Novel electromagnetic bandgap structure to mitigate simultaneous switching noise for mixed-signal system applications

2016 ◽  
Vol 9 (2) ◽  
pp. 299-306
Author(s):  
Vasudevan Karuppiah ◽  
Raju Srinivasan
Keyword(s):  
Dielectric Substrate ◽  
Wide Frequency Range ◽  
Signal System ◽  
Switching Noise ◽  
Frequency Range ◽  
Electromagnetic Bandgap ◽  
Mixed Signal ◽  
High Impedance ◽  
Simultaneous Switching Noise ◽  
Simultaneous Switching

This paper proposes a novel T-shape electromagnetic bandgap (EBG) structure to suppress simultaneous switching noise (SSN) in mixed-signal systems. Noise is generated due to simultaneous switching multiple drivers in the digital ICs. It is called as SSN. It could propagate between power and ground planes of underlying PCB platform and interfere with the functionality of nearby RF/Analog ICs. So, the RF modules are isolated from the digital module for proper functioning of entire mixed-signal system. A high-impedance surface, called T-shape EBG has been implemented between digital and RF modules. It will exhibit the characteristics of bandgap for a wide frequency range to suppress the propagation of switching noise. A single unit-cell of T-EBG is periodically patterned over one side of the PCB and the other side is kept continuous. In this paper different characteristics of T-EBG have been simulated and verified with the measurement results. A 3 × 3 T-EBG layout provides an isolation of −40 dB from 0.72 to 6.39 GHz. A scaled version of T-EBG is used to shift the bandgap towards higher frequency range from 2.22 to 7.19 GHz. Also, a novel layout methodology has been proposed to broaden the bandgap from 2.02 to 18.84 GHz without reducing the thickness of dielectric substrate.

scholarly journals Advanced high-gain slot antenna arrays for 5G and radar applications

2021 ◽  
Vol 13 (1) ◽  
pp. 29-34
Author(s):  
Marija Milijić ◽  
Branka Jokanović
Keyword(s):  
Antenna Arrays ◽  
Coplanar Waveguide ◽  
High Capacity ◽  
High Gain ◽  
Slot Antenna ◽  
Antenna Gain ◽  
Radar Sensors ◽  
Slot Arrays ◽  
Technology Applications ◽  
Operating Bandwidth

This paper presents an advanced design of high-gain slot antenna array at K-band using slots as radiating elements serially fed by coplanar waveguide (CPW). The arrays consist of identical slots of rectangular shape positioned symmetrically relative to the CPW feeding line. Firstly, the linear arrays of 14 slots are examined considering mainly their bandwidth and radiation characteristics. In addition, two identical linear sub - arrays of 14 slots are investigated when they have separate feeding in the form of two generators for each sub - array. Last, a CPW T-junction is employed to feed the antenna consisting of 2 x 14 slots which resulted in a wide operating bandwidth and maximum gain of 21.0 dBi which proved to be 2.25 dB less gain than with independent feeding. In order to enhance the antenna gain, both arrays are terminated with open-circuited stubs, so that the energy remaining after the last array element is reflected from the stub and re-radiated through the slot arrays. The length of the stubs is optimized to provide that the reflected wave is in phase with the forward-traveling waves at all the slot locations. In that way, very little energy is wasted and consequently the antenna gain is increased. The feed simplicity and uniplanar configuration of the slot arrays, designed for the frequency range 24.25-27.5 GHz, makes them attractive for radar sensors and high capacity 5G technology applications.

scholarly journals 3D Printed High Gain Complementary Dipole/Slot Antenna Array

2018 ◽  
Vol 8 (8) ◽  
pp. 1410 ◽  
Author(s):  
Kwok So ◽  
Kwai Luk ◽  
Chi Chan ◽  
Ka Chan
Keyword(s):  
Antenna Array ◽  
High Gain ◽  
Dipole Antenna ◽  
Slot Antenna ◽  
Impedance Bandwidth ◽  
Antenna Element ◽  
Frequency Range ◽  
Operating Frequency Range ◽  
3D Printed ◽  
Stable Frequency

By employing the complementary dipole antenna concept to the normal waveguide fed slot radiator, an improved antenna element with wide impedance bandwidth and symmetrical radiation patterns is developed. This is achieved by mounting two additional metallic cuboids on the top of the slot radiator, which is equivalent to adding an electric dipole on top of the magnetic dipole due to the slot radiator. Then, a high-gain antenna array was designed based on the improved element and fabricated, using 3D printing technology, with stable frequency characteristics operated at around 28 GHz. This was followed by metallization via electroplating. Analytical results agree well with the experimental results. The measured operating frequency range for the reflection coefficient ≤−15 dB is from 25.7 GHz to 29.8 GHz; its corresponding fractional impedance bandwidth is 14.8%. The measured gain is approximately 32 dBi, with the 3 dB beamwidth around 4°.

High-gain and broadband SIW cavity-backed slots antenna for X-band applications

2021 ◽  
pp. 1-8
Author(s):  
Dahbi El khamlichi ◽  
Naima Amar Touhami ◽  
Tajeddin Elhamadi ◽  
Mohammed Ali Ennasar
Keyword(s):  
Microwave Field ◽  
High Gain ◽  
Slot Antenna ◽  
Manufacturing Cost ◽  
Antenna Structure ◽  
Large Bandwidth ◽  
A Value ◽  
Half Wave ◽  
X Band ◽  
Good Agreement

Abstract Substrate-integrated waveguide (SIW) technology has recently drawn attention to its benefits in the microwave field, such as integration in planar microwave circuits, low manufacturing cost, and high-quality factor compared to other technologies. In this paper, a broadband and high gain SIW cavity-backed L-shaped slot antenna structure has been designed and made for X-band applications. Three pairs of L-shaped half-wave resonators are placed on the lower wall of the cavity (backed-slots) to further expand bandwidth and improve gain. The final antenna designed operates on a band ranging from 9.4 to 10.5 GHz with a bandwidth of 11%. Moreover, the gain reaches a value of 9.5 dBi. The final antenna is realized on a Rogers RT/Duroid 5870 substrate. The gain, the reflection coefficient, and the radiation patterns are measured and compared to the EM simulation results and a very good agreement is obtained. The proposed cavity-backed L-shaped slot antenna gives a good compromise between a high gain and a large bandwidth.

scholarly journals A Frequency Agile Semicircular Slot Antenna For Cognitive Radio System

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Rajeev Kumar ◽  
Ritu Vijay
Keyword(s):  
Frequency Tuning ◽  
Ground Plane ◽  
Wide Frequency Range ◽  
Slot Antenna ◽  
Frequency Range ◽  
Gain Bandwidth ◽  
Radio System ◽  
Slot Length ◽  
Tuning Ratio ◽  
Frequency Agile

A frequency agile antenna is proposed with its ground plane having a semicircular shaped slot which is capable of switching the frequency to different bands, one at a time, in the wide frequency range of 5.33 GHz to 9.90 GHz. To achieve frequency agility, switching of six RF PIN diodes which are placed along the slot length is done in various combinations. Frequency tuning ratio of about 1.85 : 1 can be achieved using this design. Results such as return losses, gain, bandwidth, and radiation patterns are presented in this paper.

scholarly journals Design and optimization of a microstrip patch antenna for increased bandwidth

2013 ◽  
Vol 5 (4) ◽  
pp. 529-535 ◽  
Author(s):  
Archana Agrawal ◽  
Pramod Kumar Singhal ◽  
Ankit Jain
Keyword(s):  
Patch Antenna ◽  
High Gain ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Composite Effect ◽  
Design And Optimization ◽  
Wireless Applications ◽  
Microstrip Patch ◽  
Low Profile ◽  
Radar Applications

With the ever-increasing need for wireless communication and the emergence of many systems, it is important to design broadband antennas to cover a wide frequency range. The aim of this paper is to design a broadband patch antenna, employing the three techniques of slotting, adding directly coupled parasitic elements and fractal electromagnetic band gap (EBG) structures.The bandwidth is improved from 9.3 to 23.7%. A wideband ranging from 4.15 to 5.27 GHz is obtained. Also, a comparative analysis of embedding EBG structures at different heights is also done. The composite effect of integrating these techniques in the design provides a simple and efficient method for obtaining low-profile, broadband, and high-gain antenna. By the addition of parasitic elements the bandwidth was increased to 18%. Later on by embedding EBG structures the bandwidth was increased up to 23.7%. The design is suitable for a variety of wireless applications like WLAN and radar applications.

Vivaldi antennas: a historical review and current state of art

2020 ◽  
pp. 1-18
Author(s):  
Anindita Bhattacharjee ◽  
Abhirup Bhawal ◽  
Anirban Karmakar ◽  
Anuradha Saha ◽  
Diptendu Bhattacharya
Keyword(s):  
Performance Enhancement ◽  
Historical Review ◽  
Dielectric Substrate ◽  
High Gain ◽  
Substrate Selection ◽  
Radiation Characteristics ◽  
High Data ◽  
Dielectric Lens ◽  
Vivaldi Antenna ◽  
Vivaldi Antennas

Abstract The progressions in the field of wireless technology can be highly attributed to the development of antennas, which can access high data rates, provide significant gain and uniform radiation characteristics. One such antenna called the Vivaldi antenna has attracted the utmost attention of the researchers owing to its high gain, wide bandwidth, low cross-polarization, and stable radiation characteristics. Over the years, different procedures have been proposed by several researchers to improve the performance of the Vivaldi antennas. Some of these different approaches are feeding mechanisms, integration of slots, dielectric substrate selection, and radiator shape. Correspondingly, the performance of a Vivaldi antenna can be increased by including dielectric lens, parasitic patch in between two radiators, corrugations, as well as metamaterials. This paper gives a systematic identification, location, and analysis of a large number of performance enhancement methods of Vivaldi antenna design depicting their concepts, advantages, drawbacks, and applications. The principal emphasis of this article is to offer an outline of the developments in the design of Vivaldi antennas over the last few years, where the most important offerings, mostly from IEEE publications, have been emphasized. This review work aims to reveal a promising path to antenna researchers for its advancement using Vivaldi antennas.

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