Kumud Ranjan Jha

Shri Mata Vaishno Devi University | SMVDU · School of Electronics & Communication Engineering

This paper presents the design of a co-located sub-1 GHz long-term evolution (LTE) and sub-6 GHz 5G band antennas implemented in multiple-input-multiple-output (MIMO) configuration. In addition, it demonstrates the integration of the millimetrewave (mm-wave) 5G band antenna arrays. Using the characteristic mode analysis (CMA), these antenna element...

This article presents an ultrathin absorber for lower microwave frequency applications. The structure is designed using a thin dielectric substrate and a commercially available magnetic sheet superstrate. Due to its low thickness, it is suitable for both planar and conformal applications. For the normal incidence of the electromagnetic wave, the me...

A physically compressed, multiband dipole antenna on a partially optically transparent Acrylic sheet flexible substrate material is designed. The multi‐band operation is achieved by exploiting the higher‐order resonating modes. Due to the use of the flexible substrate, and the less metallic footprint of the radiator, the antenna is flexible and con...

In this paper, an angular symmetric, common radiator coplanar waveguide (CPW) fed four-port multiple-input-multiple-output (MIMO) antenna is designed on a 0.129λL2 RT Duroid (εr=3.0, tanδ=0.001) substrate where λL is the free space wavelength at the lowest operating frequency (fL) of 0.6 GHz. The antenna has a -6 dB impedance bandwidth from 0.6-1.0...

Multipleinput‐multiple‐output (MIMO) schemes are categorized as diversity techniques, multiplexing schemes, multiple access methods, beamforming, and multifunctional MIMO arrangements. The multiplexing techniques focus to improve the attainable spectral efficiency of the system. The antenna elements are separated by half wavelength distance to achi...

This chapter discusses the various methods to design the reconfigurable antennas, application of the reconfigurable antenna in multiple‐input multiple‐output (MIMO) systems, and various MIMO performance indices related to these antennas. Antenna in MIMO systems consists of a number of transmitting and receiving antenna elements to improve the perfo...

The study presents a novel single dielectric layer wideband bandpass frequency selective surface (FSS) topology. The structure is designed using a kind of the tripole type FSS which has been analysed for its behaviour. Next, the operating bandwidth has been increased by using the meander lines in the middle of the unit‐cell. The proposed FSS struct...

In this paper, an optically transparent antenna to operate in long term evolution (LTE) band 700 MHz and 800 MHz is presented. The antenna has a -6dB impedance bandwidth extending from 730-900 MHz It has been designed on a flexible ultra-thin Acrylic sheet which may find a number of applications in the internet of things (IoT) and smart buildings

This article presents the design of a wideband bandpass frequency‐selective surface (FSS). The structure is designed using the analysis of the generalized scattering matrix (GSM)‐based transmission phase range. A relationship between the transmission phase range and the bandpass fractional bandwidth (FBW) is developed. The analysis reveals that the...

In this paper, the beam-steering characteristics of photoconductive dipole phased array antenna coniguration at 1.95 THz is presented. The proposed array antenna coniguration with frequency selective surface favourably improves its gain and directivity which is useful to upsurge the imaging capabilities to address the deliberations such as limited...

The prospects for improving the gain and directivity of a photoconductive dipole antenna (PCA) using a bandpass frequency-selective surface (FSS) as a superstrate at terahertz frequencies for imaging and sensing applications are presented. The physical parameters of the proposed bandpass FSS for the PCA are determined using a simple synthesis techn...

In this paper, a highly directive photoconductive dipole array antenna is presented for imaging system operating at terahertz (THz) frequencies. The array antenna is formed on a single photoconductive substrate to make it compact and suitable for THz imaging applications. The presented photoconductive dipole array antenna improves the gain as well...

A novel compact single-substrate planar multiband 5-element multiple input multiple output (MIMO) antenna system is presented in this paper. The tunable 2-element folded meandered MIMO antenna covers the long-term evolution (LTE) frequency bands below 1.0 GHz (687 MHz-813 MHz) and radio frequency identification (RFID) bands centered around 2.4 GHz...

The terahertz (THz) regime of the electromagnetic spectrum is rich with the emerging possibilities in imaging applications with unique characteristics to screening for weapons, explosives and bio-hazards, imaging of concealed objects, water content, and skin, and these advantages can be harnessed by using the effective THz sources and detectors. In...

With the development of the fourth-generation (4G) and fifth-generation (5G) wireless systems and the high-data transmission rate requirements, multiple-input, multiple-output (MIMO) antennas are becoming necessary in mobile terminals. Handheld mobile devices support various service standards, such as Wi-Fi, LTE, Wi-Max, personal communications ser...

In this article, a wide stopband 20 dB harmonically suppressed low-pass filter (LPF) using novel defected ground structures (DGSs) is proposed. The DGSs has been analyzed as a low pass filter which shows a significant harmonics suppression in the stopband. The lumped parameter equivalent of the DGSs has been developed to show its effectiveness. The...

A novel compact microwave absorber with 10 dB absorption level in 1.8-2.1 GHz frequency band for the wireless communication applications is investigated. A robust equivalent circuit (EC) model of the structure is developed and rigorously analysed using a non-resonance constituent parameter extraction technique. The EC model and the proposed topolog...

In this paper, the design and simulation of a novel ultra-thin low-frequency wideband 2-layer microwave absorber is presented. The study is extended to the analysis of conformal shape of the absorber. The 90% absorption (A) bandwidth of the structure is about 66% in the frequency range of 1.7-3.4 GHz and thus, it may find applications in the wirele...

A compact planar antenna sources with on-chip fabrication and high directivity in order to achieve large depth-of-field for better image resolution is the prospective demand for THz imaging application. Therefore, the small-gap photoconductive dipole antennas have been explored to fulfil such applications demand. However, there are certain modaliti...

In this article, a metamaterial inspired microwave absorber is used to reduce thecross-polarization (XP) level of the radiated wave in microstrip antenna (MSA). Amicrowave absorber unit-cell has been analyzed and implemented to reduce the crosspolarization (XP) level in a single element and a 2 3 2 microstrip patch array antennas. The antennas have...

In this paper, a novel topology of the coplanar waveguide fed truncated octahedron-shaped antenna is proposed. The linearly polarized antenna operates over the triple radio frequency identification technique (RFID) bands of 858-930MHz, 2.4-2.454 GHz, and 5.725-5.875 GHz at ultrahigh frequency (UHF), microwave-, and super high-frequency bands, respe...

In this paper, we have analyzed a photoconductive dipole antenna at terahertz (THz) frequency for sensing and imaging applications. For these applications, to detect powdered explosives, there is a need to have an image of the object under detection with high resolution to distinguish suspicious items from the normal background. The THz antenna is...

In this paper we will give a new way of designing spatial filters (frequency selective surfaces) being widely used in several microwave and optical systems. In this paper we will analyze transmission and reflection of electromagnetic waves from complex thick/thin metallic frequency selective surface (FSS). In this work, we have designed the spatial...

In this paper a novel low-profile single-layer tri-band frequency selective surface (FSS) unit-cell, which consists of dual concentric modified circular ring, is analyzed and simulated. It can be utilized in the satellite communication systems and electromagnetic shielding applications. The proposed structure has been developed using the modificati...

An overview of recent progress in research and development of various design issues as well as the technical advancements experienced by the frequency selective surfaces (FSSs) in terms of the mechanical integrity, choice of the numerical techniques, reflection as well as the transmission bandwidth, angular/polarization stability, complexity and th...

In this paper, an azimuthally periodic wedge-shaped circular aperture frequency selective surface (FSS) is discussed, which provides the dual polarized and angular stable frequency response with significantly more fractional bandwidth (FBW) up to 50° angle-of-incidence (AOI) at S-band, Ku-band and Ka-band. In addition to this, the equivalent circui...

In this paper, a new geometrical shape of the bandpass modified circular ring frequency selective surface (FSS) structure with significant electrical response such as angular stability up to 50◦ of the angle-of-incidence (AOI) for both the perpendicular (TE) and parallel (TM) polarized waves has been discussed. The geometrical parameters of the pro...

In this paper, a simple synthesis technique to obtain the geometrical parameters of the modified circular ring for angular and polarizations (perpendicular and parallel) stable frequency selective surface (FSS) has been discussed. The geometrical parameters of the modified circular ring FSS structure have been achieved using the proposed synthesis...

In this paper, a single-layer multiband slot-type frequency selective surface (FSS), which consists of a modified circular ring loaded with concentric conventional circular ring, is discussed. We have emphasized to design an angular as well as polarization stable multiband FSS structure with reflection characteristics in S-band (2–4 GHz)/Ku (12–18...

Frequency tunable printed monopole antennas in combination with a quasi-elliptical monopole antenna (EPMA) are presented in multiple inputs multiple output (MIMO) configurations on a cell phone size ground plane. Printed tunable monopole antenna covers long term evolution (LTE) band between 700MHz to 900MHz with 20 MHz flexible bandwidths. The quas...

In this paper, we have explored and extended the use of frequency selective surface towards the terahertz regime of the electromagnetic where interesting applications such as imaging, sensing and communication exist. We have discussed a synthesis technique to design the single square loop frequency selective surface (SSLFSS) at 150 and 300 which ha...

Departm 5500 Cam Emails: jha Abstract—A novel technique to feed a microstr at terahertz (THz) frequency is discussed. To fe patch antenna, the waveguide impedance trans used. The analysis shows that with the help o transformer, the impedance of the antenna and matched. This paves the way for realizing patch frequency using a practical excitation me...

To meet the high gain requirement, a 2x2 a microstrip patch antenna array is designed and used as a feed source to illuminate a symmetric parabolic reflector antenna at 300 GHz. The effect of the substrate and conductor material properties on the performance of the microstrip array antenna is discussed. Resulting reflector antenna performance is di...

In this manuscript, a new design of a compact printed elliptical disc ultrawideband antenna with defected ground plane for UWB applications is proposed. The designed antenna is fed by a 5Ω microstrip line and printed on a dielectric FR4 substrate of permittivity εr = 4.4 and thickness h= 0.8 mm. The optimization process on the planar ellipticalshap...

Abstract-In this manuscript, a reduced ground plane size printed antenna suitable for wireless universal serial bus (USB) dongle application is proposed. By creating notches and embedding slots into a rectangular patch, multiple resonances with effective bandwidth enhancement is achieved. The antenna is designed on the FR-4 substrate of length, wid...

In this paper, the analysis and simulation of a novel geometrical structure of the frequency selective surface (FSS), which has been achieved through the conductive loading of the simple circular ring with wedge-shaped metal vanes has been discussed. The electrical performance and behavior of the proposed structure have been studied in Ku band (12–...

In this paper, the relationship between the num-ber of unit-cells used in the design of a frequency selec-tive surface (FSS) and its expected directivity is established. The relationship between the number of FSS unit-cells and the directivity is based on the planer microstrip patch array antenna design concept where the unit-cell is treated as the...

Terahertz frequency (THz) band is coarsely defined as a portion of the electromagnetic spectrum, which extends from 0.1 to 10 THz and occupies an extremely large regime of the electromagnetic spectrum between the infrared and microwave bands. This far-infrared region is important because of the rich physical and chemical processes with spectrograph...

In the preceding Chap. 3, the electromagnetic bandgap material (EBG) has been analyzed in detail and its potential application in the microstrip patch antenna design has been explored.

The wireless application of the electromagnetic spectrum is greatly influenced by the antenna as it is the key component. To enhance the application of the terahertz regime of the electromagnetic spectrum, however, various antennas have been developed [1–5]. The photodiode antenna is the most popular and oldest at the THz in which the emission take...

There are a number of application areas of the terahertz (THz) spectrum which have been identified and discussed in Chap. 1. These potential areas can be categorized into the traditional and modern application areas. The traditional application areas are the imaging, sensing, and spectroscopy. In addition to this, the terahertz wireless communicati...

The dream of the receiver subsystems in a chip is even complete transceivers, makes the millimeter/terahertz wave region and MMIC technology development the key factor. The communication system designer must not only integrate the antenna and its associated circuits but also the phase shifter, amplifiers and control circuits. the use of integrated...

In Chaps. 6 and 8, the application of the frequency selective surfaces (FSS) at the terahertz (THz) frequency has been discussed.

The hostile atmospheric condition increases the attenuation of the signal, and it becomes very significant over 100 GHz, which is the lower boundary of the terahertz regime of the electromagnetic spectrum. The signal loss restricts the use of this license-free band (above 250 GHz) to be effectively utilized in the various scientific applications. H...

Highly reflective surfaces as superstrate are widely used to enhance the directivity of an elementary dipole and microstrip antennas in the microwave and millimeter wave frequency regime of the electromagnetic spectrum. It is also demonstrated that such type of structures are also suitable for the terahertz application where the directivity is the...

This book describes various methods to enhance the directivity of planar antennas, enabling the next generation of high frequency, wireless communication. The authors discuss various applications to the terahertz regime of the electromagnetic spectrum, with an emphasis on gain enhancement mechanisms. The numerical models of these antennas are prese...

In This manuscript, a small reduced ground plane printed antenna to be used in WLAN/WiMax is analyzed. The reduced ground plane antenna is designed on the FR-4 substrate whose length width and thickness are 30 mm, 15 mm and 0.8 mm, respectively. The length and width of the antenna are 10 mm and 15 mm respectively. The compact antenna offers a wide...

In this paper, a synthesis process of the circular loop frequency selective surface (FSS) is explored and based on the proposed theory, the design of a bandstop and bandpass FSS is analyzed. The study has been focused to develop an angular stable bandpass FSS structures at 26 GHz with 15 % bandwidth, which could be used in the satellite communicati...

a b s t r a c t In this paper, a low-relative dielectric permittivity substrate material PTFE (ε = 2.08, tan ı = 0.0004) with the periodic implantation of air cylinders has been analyzed at 600 GHz. Further, it has been shown that the effective permittivity of the material in this case is reduced below 1.0 and due to this the size of the patch is i...

h i g h l i g h t s The application scenario of the terahertz (THz) spectrum in communication has been discussed. A brief review of the semiconductor terahertz sources for compact communication system has been presented. The need of the high gain antennas for the communication has been presented. The importance of the planar antennas in the THz com...

In this paper, a simple synthesis method of the circular ring frequency selective surface has been discussed. However, the proposed technique is used to design circular ring frequency selective surface at 3GHz, 15 GHz and 26 GHz and analytical results of each frequency of interest has been supported by simulation results, which has been performed b...

In this paper, the transmission/reflection characteristics of a circular ring frequency selective surface (FSS) has been discussed. We have also explored a method for computing the various structure parameters of a frequency selective surface. The analytical results of the proposed structure are comparable to that of the desired result. This proces...

In this paper, a dielectric slab with periodic im-plantation of the air gaps has been analyzed. An effective dielectric permittivity of the 1-D photonic bandgap substrate material (PBG material) with host material as Polytetraflu-oroethylene (PTFE) has been computed at 600 GHz. Based on the extracted effective dielectric permittivity, a rectan-gula...

In this paper, a probe-fed rectangular microstrip patch antenna with partially reflective superstrate at terahertz frequency (600 GHz) has been analyzed and simulated. The analysis of the partially reflective surface shows the highly reflective property of the surface over the wideband of the frequencies. The analysis of a specific configuration (r...

In this paper, a novel lens integrated ring-resonator microstrip antenna is analyzed and simulated at 600 GHz. A mathematical model to compute the directivity of this kind of the antenna has been developed and the directivity of the antenna has been computed which is 18 dBi. The proposed model has been simulated by using CST Microwave Studio a comm...

In this paper, a probe‐fed rectangular microstrip patch antenna with metallic frequency selective surface as superstrate has been analyzed and simulated at terahertz frequency. In addition to this, a novel technique has been proposed to predict the directivity of the antenna at submillimeter and terahertz waves where far‐field measurement is a chal...

In this manuscript, a simple synthesis method of single square loop frequency selective surface (SSLFSS) is discussed, which may find the suitable application in the fast analysis and fabrication of the frequency-selective surface. The presented technique is used to design SSLFSS at 3 GHz, 15 GHz, 22 GHz and 26 GHz. At every frequency of interest,...