Search results for: Djuradj Budimir

Items from 1 to 20 out of 46 results

article

Miniaturized quadrature hybrid couplers based on novel U‐shaped transmission lines

Oludotun Olukoya, Andjelija Ilic, Ananjan Basu, Djuradj Budimir

Microwave and Optical Technology Letters > 61 > 2 > 509 - 512

In this paper, a miniaturized microstrip quadrature hybrid coupler (QHC) using U‐shaped transmission lines (USTLs) is presented. The proposed approach replaces all arms of the conventional QHC with its equivalent USTL to achieve compactness. The proposed coupler structure is designed to operate in the 1.5 GHz (1427‐1518 [MHz]) band which is one of the 5G bands of interest. At such low RF/microwave...

article

Highly linear balanced power amplifiers for carrier aggregation

Oludotun Olukoya, Djuradj Budimir

Microwave and Optical Technology Letters > 60 > 3 > 529 - 534

This article presents a highly linear balanced power amplifier with miniaturized quadrature hybrid coupler for carrier aggregation (CA). The miniaturized quadrature coupler is designed using a novel U‐shaped transmission line (USTL) concept to achieve good size reduction. The novel branch‐line coupler is used to design a wideband balanced PA. The performance of the balanced PA is compared to a single...

chapter

Design of monopole antennas for uwb applications

Waqas Ahmad, Andrzej Tarczynski, Djuradj Budimir

2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting > 2323 - 2324

2017 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting

Presented are the design method, equations, and results of a broadband monopole antenna for UWB applications. The antenna is a fat monopole; made of rectangular and circular patches. Measured results show a passband of 2.8–11.97 GHz. Parametric studies of the effects of the ground plane and the gap between the radiating element and the ground plane were done and their results given. The gain and efficiency...

chapter

Miniaturised inkjet-printed quadrature hybrid couplers for multiband wireless systems

Oludotun Olukoya, Andrzej Tarczynski, Djuradj Budimir

2017 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium) > 83 - 84

2017 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium)

A miniaturised multiband inkjet printed Quadrature Hybrid Coupler is proposed in this paper. The design and flexibility characterization of an inkjet-printed coupler on a flexible 50 μm polyimide film (Kapton) substrate is presented. Kapton is chosen due to its good balance of physical, chemical and electrical properties with a low loss factor of 0.0021. The coupler is designed to operate at 1.5 GHz,...

article

Coupled CRLH transmission lines for compact and high selective bandpass filters

Ahmed A. Ibrahim, Mahmoud A. Abdalla, Djuradj Budimir

Microwave and Optical Technology Letters > 59 > 6 > 1248 - 1251

A compact size and high selective bandpass filter is presented in this paper. The filter is designed to serve at 3.5 GHz with two transmission zeros at 3.35 GHz and 3.85 GHz. The filter is designed as two gap capacitor coupled to two coupled composite right–left handed transmission lines. The coupled lines were designed to demonstrate a zeroth order phase at 3.5 GHz. Also, the transmission zeros were...

article

An adaptive fuzzy logic system for the compensation of nonlinear distortion in wireless power amplifiers

Mina Vaskovic, Vassilis S. Kodogiannis, Djuradj Budimir

Neural Computing and Applications > 2018 > 30 > 8 > 2539-2554

Computational intelligent systems are becoming an increasingly attractive solution for power amplifier (PA) behavioural modelling, due to their excellent approximation capability. This paper utilizes an adaptive fuzzy logic system (AFLS) for the modelling of the highly nonlinear MIMIX CFH2162-P3 PA. Moreover, PA’s inverse model based also on AFLS has been developed in order to act as a pre-distorter...

chapter

Compact UWB MIMO filtennas with dual bandnotch, high isolation and high diversity

Waqas Ahmad, Miodrag Tasic, Djuradj Budimir

2016 Asia-Pacific Microwave Conference (APMC) > 1 - 4

2016 Asia-Pacific Microwave Conference (APMC)

This paper presents a 4×4 MIMO filtenna aimed for use with UWB applications. The MIMO filtenna is simulated, fabricated and measured. Obtained simulation and measurement results agree well with each other and have been presented to validate the accuracy of the proposed structure. Measured passband is 2.96–11.56 GHz, with dual bandnotch at 3.5 GHz (S₁₁ = −1.25 dB) and 6.05 GHz (S₁₁ = −2.4 dB). Measured...

chapter

Compact inline e-plane waveguide resonators and bandpass filters with I-shaped resonant insets

Uros Jankovic, Djuradj Budimir

2016 Asia-Pacific Microwave Conference (APMC) > 1 - 4

2016 Asia-Pacific Microwave Conference (APMC)

In this paper, waveguide resonators and bandpass filters with E-plane inserts containing I-shaped resonant insets are presented. These insets introduce to the response finite transmission zeros much less sensitive than those produced by cross-couplings. Also, their use results in structure compactness, unlike bandstop resonant cavities that add volume. Two kinds of extracted pole sections that demonstrate...

chapter

Inkjet-printed bandstop filters for interference suppression in multi-standard wireless systems

Oludotun Olukoya, Djuradj Budimir

2016 Asia-Pacific Microwave Conference (APMC) > 1 - 4

2016 Asia-Pacific Microwave Conference (APMC)

This paper presents a highly compact inkjet printed microstrip bandstop filter (BSF) for interference suppression in multi-standard wireless applications. The structure is designed with strict specifications for inkjet printing such as the use of the Kapton substrate and its flexible polyimide film. The design was simulated based on Kapton substrate with a thickness of 50µm and dielectric constant...

chapter

Inkjet-printed antennas for 28 GHz 5G applications

Waqas Ahmad, Djuradj Budimir

2016 Asia-Pacific Microwave Conference (APMC) > 1 - 4

2016 Asia-Pacific Microwave Conference (APMC)

This paper presents the layout and results of an inkjet-printed antenna for 5G applications operating at 28 GHz. The inkjet-printing based antenna was modelled using silver nanoparticle ink on flexible Kapton substrate, with copper for the ground plane. Simulation results of the antenna have been presented. The antenna shows a resonant frequency at 27.75 GHz at a return loss of more than 16 dB. The...

chapter

Switchable filtennas with sharp dual bandnotch using looped resonators

Waqas Ahmad, Djuradj Budimir

2016 46th European Microwave Conference (EuMC) > 445 - 448

2016 46th European Microwave Conference (EuMC)

This paper proposes a reconfigurable/switchable UWB filtenna with sharp dual bandnotch at WiMAX 3.5 GHz and WLAN 5.8 GHz bands. The filtenna is formed by placing three looped resonators in an UWB antenna. The resonators are fitted with Graphene based switches and PIN diodes which introduce reconfigurability. The filtenna was simulated and measured in switch OFF and ON states. Results show a measured...

chapter

Compact inkjet-printed broadband filtennas with triple bandnotch

Waqas Ahmad, Djuradj Budimir, Cedo Zlebic

2016 46th European Microwave Conference (EuMC) > 80 - 83

2016 46th European Microwave Conference (EuMC)

Presented in this paper are the layout and results of a compact inkjet-printed filtenna which is operational at a broadband frequency range, which includes the S-band, ISM and UWB frequencies. Alongside, the filtenna is able to reject the unwanted and interfering WiMAX 3.5 GHz, WLAN 5.8 GHz and ITU service 8.2 GHz signal bands. The filtenna was simulated, printed using silver nanoparticle ink on flexible...

article

Ultra Compact Inline $E$ -Plane Waveguide Bandpass Filters Using Cross Coupling

Nandun Mohottige, Oleksandr Glubokov, Uros Jankovic, Djuradj Budimir

IEEE Transactions on Microwave Theory and Techniques > 2016 > 64 > 8 > 2561 - 2571

This paper presents novel ultracompact waveguide bandpass filters that exhibit pseudoelliptic responses with the ability to place transmission zeros on both sides of the passband to form sharp rolloffs. The filters contain

$E$

-plane extracted pole sections (EPSs) cascaded with cross-coupled filtering blocks. Compactness is achieved by the use of evanescent mode sections and closer arranged resonators...

chapter

Reconfigurable UWB filtennas with dual bandnotch for unwanted bands using graphene based switches

Waqas Ahmad, Djuradj Budimir

2016 IEEE International Symposium on Antennas and Propagation (APSURSI) > 2123 - 2124

2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting

Presented are the design and results of a reconfigurable UWB filtenna with sharp dual bandnotch at WiMAX 3.5 GHz and WLAN 5.8 GHz bands. The filtenna is formed by placing three loop resonators in an UWB antenna. The resonators are fitted with Graphene based switches which introduce reconfigurability. The filtenna was simulated electromagnetically and with Graphene based switches in switches OFF and...

chapter

Inkjet-printed filtennas with triple bandnotch

Waqas Ahmad, Djuradj Budimir, Cedo Zlebic

2016 IEEE International Symposium on Antennas and Propagation (APSURSI) > 825 - 826

2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting

This paper presents the layout and results of a compact inkjet-printed filtenna operating at the S-band, ISM and UWB frequencies. The filtenna has a wide passband and, alongside, rejects WiMAX 3.5 GHz, WLAN 5.8 GHz and ITU service 8.2 GHz bands. The filtenna is simulated, printed using silver nanoparticle ink on flexible Kapton substrate and measured. Obtained simulation and measurement results agree...

chapter

Cascade-Connected ANN Structures for Indoor WLAN Positioning

Miloš Borenović, Aleksandar Nešković, Djuradj Budimir

Lecture Notes in Computer Science > Intelligent Data Engineering and Automated Learning - IDEAL 2009 > Neuro-Informatics, Bio-Informatics and Bio-Inspired Models > 392-399

Various radio systems can be used to obtain the position information in indoor environments. Due to the ubiquitous presence of WLAN networks, positioning techniques in these environments are the scope of intense research. This paper explores the properties of cascade-connected Artificial Neural Networks (ANNs) structures. Several cascade-connected ANN structures with space partitioning are compared...

chapter

UWB filtennas with dual bandnotch for WiMAX and WLAN bands using circular and square resonators

Waqas Ahmad, Djuradj Budimir

Active and Passive RF Devices Seminar > 1 - 3

Active and Passive RF Devices Seminar

This paper presents the design and results of an UWB filtenna with dual bandnotch present at WiMAX 3.5 GHz and WLAN 5.8 GHz bands. The filtenna is formed by the implementation of a filtering section - consisting of a circular ring resonator and two square ring resonators - within an UWB antenna. The filtenna was simulated using electromagnetic software and the simulated results of return loss, radiation...

chapter

Compact inkjet printed bandstop filters using defected microstrip structure on flexible substrate

Oludotun Olukoya, Djuradj Budimir

Active and Passive RF Devices Seminar > 1 - 3

Active and Passive RF Devices Seminar

This paper presents a compact inkjet printed microstrip Bandstop Filters (BSF) on Flexible Substrate. To achieve a compact size, the defected microstrip structure (DMS) structure was employed. A 0.05 mm thick kapton polymide substrate with a dielectric constant of 3.4 suitable for inkjet printing was used. Simulated results show a narrowband response with good stopband attenuation of -39 dB, excellent...

article

Dual‐band filtenna array for WLAN applications

Waqas Ahmad, Djuradj Budimir

Microwave and Optical Technology Letters > 58 > 2 > 477 - 481

This article presents the design and results of a dual‐band antenna array integrated with bandpass filters for WLAN applications. The array is fed with a single 50 Ω port and consists of two radiating elements; thereby having a 1 × 2 array structure. The two bands of the antenna array correspond to the two WLAN bands of 2.4 GHz and 5.8 GHz. A standalone array has first been designed. Other than the...

article

Magnetically biased graphene‐based switches for microwave applications

Branko Bukvic, Djuradj Budimir

Microwave and Optical Technology Letters > 57 > 12 > 2956 - 2958

This article presents a magnetically biased graphene‐based switch for coplanar waveguides (CPW) resonator applications. Graphene patches are set in the gap between signal and ground lines, thus, obtaining the whole structures act as switchable elements. Graphene was modeled as a general material with appropriate surface conductivity. The presented CPW resonator structure acts like a switch in ON state...

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Keywords

BANDNOTCH (7)
POWER AMPLIFIERS (7)
BAND-PASS FILTERS (5)
FILTENNAS (5)
UWB (5)
DISTORTION (4)
DUAL BAND (4)
MICROWAVE FILTERS (4)
NONLINEAR DISTORTION (4)
PASSBAND (4)
RESONANT FREQUENCY (4)
ANTENNAS (3)
COUPLINGS (3)
DIGITAL PREDISTORTION (3)
EXTRACTED POLE FILTERS (3)
FILTERING THEORY (3)
GRAPHENE (3)
I/Q MODULATORS (3)
IMPEDANCE (3)
INKJET PRINTING (3)
INLINE FILTERS (3)
LINEARIZATION TECHNIQUES (3)
PIN DIODES (3)
QUADRATURE HYBRID COUPLERS (3)
SUBSTRATES (3)
TWO-BOX MODEL (3)
UWB FILTENNAS (3)
4G MIMO TRANSMITTERS (2)
ANTENNA ARRAYS (2)
BANDPASS FILTERS (2)
BANDSTOP FILTERS (2)
BROADBAND (2)
CONCURRENT DUAL-BAND TRANSMITTERS (2)
CROSS-MODULATION (2)
E-PLANE FILTERS (2)
GAIN (2)
GRAPHENE BASED SWITCHES (2)
HARMONIC ANALYSIS (2)
INJECTION (2)
INTEGRATED CIRCUIT MODELING (2)
INTERMODULATION (2)
LINEARITY (2)
MATHEMATICAL MODEL (2)
MICROSTRIP FILTERS (2)
MICROWAVE AMPLIFIERS (2)
NEURAL NETWORKS (2)
POLYNOMIALS (2)
POWER HARMONIC FILTERS (2)
PREDISTORTION (2)
PRINTING (2)
RADIO FREQUENCY (2)
RECONFIGURABLE (2)
RECONFIGURABLE ELEMENTS (2)
RESONATOR FILTERS (2)
RESONATORS (2)
TRANSMITTERS (2)
ULTRA WIDEBAND ANTENNAS (2)
U‐SHAPED TRANSMISSION LINE (2)
WAVEGUIDE FILTERS (2)
WIRELESS LAN (2)
WLAN (2)
$E$ -PLANE FILTERS (1)
2.14 GHZ (1)
ADJACENT CHANNEL POWER RATIO (1)
ADMITTANCE (1)
ANTENNA MEASUREMENTS (1)
ANTENNA RADIATION PATTERNS (1)
ARRAYS (1)
ARTIFICIAL NEURAL NETWORK (1)
ARTIFICIAL NEURAL NETWORKS (1)
BAND PASS FILTERS (1)
BAND-STOP FILTERS (1)
BANDSTOP FILTERS (BSF) (1)
BANDWIDTH (1)
BASEBAND (1)
BEHAVIORAL MODELING (1)
BIDIRECTIONAL PATTERNS (1)
BIOLOGICAL NEURAL NETWORKS (1)
BROADBAND ANTENNAS (1)
BSF (1)
C-SLOT (1)
CAPACITANCE (1)
CASCADE-CONNECTED (1)
CAVITY RESONATORS (1)
CENTRAL FREQUENCY (1)
CIRCULAR RING RESONATOR (1)
COGNITIVE RADIO (1)
COMPACT DUAL-MODE MICROSTRIP FILTERS (1)
COMPACT FILTERS (1)
COMPACT INKJET PRINTED MICROSTRIP BANDSTOP FILTERS (1)
COMPACT MULTILAYER SUBSTRATE INTEGRATED FOLDED WAVEGUIDE FILTER (1)
COMPLEXITY THEORY (1)
COMPOSITE RIGHT/LEFT HANDED MATERIAL (1)
COMPUTATIONAL MODELING (1)
COMPUTER ARCHITECTURE (1)
CONSTANT BANDWIDTH (1)
CONTIGUOUS/NONCONTIGUOUS CA (1)
COPLANAR WAVEGUIDES (1)
COPLANAR WAVEGUIDES RESONATOR (1)
COUPLED‐LINE COUPLER (1)
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INFONA - science communication portal

Search results for: Djuradj Budimir

Miniaturized quadrature hybrid couplers based on novel U‐shaped transmission lines

Highly linear balanced power amplifiers for carrier aggregation

Design of monopole antennas for uwb applications

Miniaturised inkjet-printed quadrature hybrid couplers for multiband wireless systems

Coupled CRLH transmission lines for compact and high selective bandpass filters

An adaptive fuzzy logic system for the compensation of nonlinear distortion in wireless power amplifiers

Compact UWB MIMO filtennas with dual bandnotch, high isolation and high diversity

Compact inline e-plane waveguide resonators and bandpass filters with I-shaped resonant insets

Inkjet-printed bandstop filters for interference suppression in multi-standard wireless systems

Inkjet-printed antennas for 28 GHz 5G applications

Switchable filtennas with sharp dual bandnotch using looped resonators

Compact inkjet-printed broadband filtennas with triple bandnotch

Ultra Compact Inline $E$ -Plane Waveguide Bandpass Filters Using Cross Coupling

Reconfigurable UWB filtennas with dual bandnotch for unwanted bands using graphene based switches

Inkjet-printed filtennas with triple bandnotch

Cascade-Connected ANN Structures for Indoor WLAN Positioning

UWB filtennas with dual bandnotch for WiMAX and WLAN bands using circular and square resonators

Compact inkjet printed bandstop filters using defected microstrip structure on flexible substrate

Dual‐band filtenna array for WLAN applications

Magnetically biased graphene‐based switches for microwave applications

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