scholarly journals Design of an Ultra-Wideband Transition from Double-Sided Parallel Stripline to Coplanar Waveguide

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Young-Gon Kim ◽  
Kang Wook Kim
Keyword(s):  
Insertion Loss ◽  
Design Method ◽  
Coplanar Waveguide ◽  
Characteristic Impedance ◽  
Ultra Wideband ◽  
Clear Guideline ◽  
Em Simulation ◽  
Simulation Results ◽  
Analytical Expressions ◽  
Wideband Transition

A design method of an ultra-wideband transition from double-sided parallel stripline (DSPSL) to coplanar waveguide (CPW) is proposed based on analytical expressions of characteristic impedance. The conformal mapping is used to obtain the characteristic impedance for each section of the transition within 3.7% accuracy as compared with the EM simulation results. An efficient and clear guideline for the design of the transition is proposed. The implemented transition performs less than 0.6 dB insertion loss per transition for frequencies from 40 MHz to 12 GHz and less than 1.2 dB insertion loss to 27 GHz, which well exceeds the previous results in the literature.

scholarly journals A New Design Method for Ultrawideband Microstrip-to-Suspended Stripline Transitions

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Young-Gon Kim ◽  
Kang Wook Kim
Keyword(s):  
Conformal Mapping ◽  
Insertion Loss ◽  
Design Method ◽  
Impedance Matching ◽  
Characteristic Impedance ◽  
Ultra Wideband ◽  
Efficient Design ◽  
Em Simulation ◽  
Simulation Results ◽  
Analytical Expressions

A clear and efficient design method for ultra-wideband microstrip-to-suspended stripline transition, which is based on the analytical expressions of the whole transitional structure, is presented. The conformal mapping is applied to obtain the characteristic impedance of the transitional structure within 2.85% accuracy as compared with the EM-simulation results. The transition is designed to provide broadband impedance matching and smooth field conversion. The implemented transition performs less than 0.6 dB insertion loss per transition for frequencies up to 30 GHz.

Bandstop Filters with Comb-Like Electromagnetic Bandgap Structures on CPW Stubs

2009 ◽  
Vol 74 ◽  
pp. 189-192
Author(s):  
Zhong Liang Deng ◽  
J.M. Huang ◽  
B.H. Ding
Keyword(s):  
Insertion Loss ◽  
Low Cost ◽  
Coplanar Waveguide ◽  
Ultra Wideband ◽  
Pass Band ◽  
Surface Micromachining ◽  
Electromagnetic Bandgap ◽  
Band Stop Filter ◽  
Immense Potential ◽  
Bandstop Filters

An ultra-wideband (UWB) band-stop filter (BSF) has been designed with flat responses at a selected frequency by cascading the unit electromagnetic bandgap (EBG) structures in this paper. The BSFs fabricated by the surface micromachining process have immense potential to compactness and low cost. The BSFs are constructed with comb-like EBG structures on a coplanar-waveguide (CPW) and have been investigated numerically. The simulation result of the BSF is demonstrated to have a good performance on its work band. It reveals a 20 dB stopband with a bandwidth of 6.8GHz. The pass-band insertion loss is less than 1.7dB.

scholarly journals Design of a CPW-Fed Band-Notched UWB Antenna Using a Feeder-Embedded Slotline Resonator

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Amin M. Abbosh
Keyword(s):  
Design Method ◽  
Coplanar Waveguide ◽  
The Other ◽  
Ultra Wideband ◽  
Uwb Antenna ◽  
Wideband Antenna ◽  
Compact Size ◽  
Two Samples ◽  
Bandstop Filter

A complete design method for a compact uniplanar ultra-wideband antenna with subband rejection capability is presented. A slotline resonator is incorporated in the coplanar waveguide feeder of the antenna to act as a bandstop filter, hence enabling the rejection of any undesired band within the passband of the antenna. Two samples of the proposed antenna were designed and manufactured. One of the developed antennas does not contain a resonator, whereas the other contains a slotline resonator. The designed antennas feature a compact size of 27 mm×27 mm. Results of the simulation and measurement show that the designed antennas have a bandwidth from 3 GHz to more than 11 GHz. The results also reveal that the use of the resonator in the feeder of the antenna efficiently rejects any undesired subband, such as the 4.9–5.9 GHz band assigned for IEEE802.11a and HIPERLAN/2. The gain of the antennas with the resonator is about 2.2 dBi at the passband, while it is less than −8 dBi at the rejected subband.

scholarly journals Inverted Diamond-shaped Notched Substrate and Patch for High-frequency Interference on Ultra-wideband Antenna

2017 ◽  
Vol 7 (6) ◽  
pp. 2929
Author(s):  
Raed Abdulkareem Abdulhasan ◽  
Khairun Nidzam Ramli ◽  
Rozlan Alias ◽  
Lukman Audah ◽  
Abdul Rashid Omar Mumin
Keyword(s):  
Electromagnetic Interference ◽  
High Frequency ◽  
Coplanar Waveguide ◽  
Impedance Matching ◽  
Ultra Wideband ◽  
Wideband Antenna ◽  
Notched Band ◽  
Measurement Results ◽  
Simulation Results ◽  
Special Process

<span>Notches loaded on a patch antenna can affect significantly on </span><em><span lang="AR-SA">‎</span></em><span>the antenna impedance matching. Therefore, notching technique is an efficient way to reduce </span><em><span lang="AR-SA">‎</span></em><span>the electromagnetic interference with unwanted bands. In this paper, a </span><em><span lang="AR-SA">‎</span></em><span>novel inverted diamond</span><em><span lang="AR-SA" dir="RTL">‏-‏</span></em><span>shaped closed-end slot on a substrate and </span><em><span lang="AR-SA">‎</span></em><span>vertex-fed printed hexagonal patch ultra</span><em><span lang="AR-SA" dir="RTL">‏-‏</span></em><span>wideband antenna is proposed for high-frequency band rejection. This antenna is fed using </span><em><span lang="AR-SA">‎</span></em><span>coplanar waveguide, and it is </span><span lang="EN-GB">optimised</span><span> by veering several patch </span><em><span lang="AR-SA">‎</span></em><span>parameters which further improved the inter bandwidth at both the </span><em><span lang="AR-SA">‎</span></em><span>lower and upper bands. However, the centre-notched band is shifted </span><em><span lang="AR-SA">‎</span></em><span>from 6 GHz to 7.5 GHz by cutting the inverted diamond shape in a </span><em><span lang="AR-SA">‎</span></em><span>special process. The developed ultra-wideband antenna is verified by </span><em><span lang="AR-SA">‎</span></em><span>comparing the simulation results with the measurement results. The </span><em><span lang="AR-SA">‎</span></em><span>measured results with a fractional bandwidth of 133% have a good </span><em><span lang="AR-SA">‎</span></em><span>agreement with the simulation results 146%. Moreover, the measured radiation showed omnidirectional patterns</span><em><span lang="AR-SA">‎</span></em><span lang="EN-GB">.</span>

Ultra‐wideband transition from stripline to conductor‐backed coplanar waveguide

2015 ◽  
Vol 51 (13) ◽  
pp. 996-998 ◽  
Author(s):  
In‐Bok Kim ◽  
Hyun‐Chul Choi ◽  
Kang Wook Kim
Keyword(s):  
Coplanar Waveguide ◽  
Ultra Wideband ◽  
Wideband Transition

scholarly journals Design of a Suspended Stripline Narrow Bandpass Filter with Ultrawideband Harmonic Suppression

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Ju Seong Park ◽  
Wahab Mohyuddin ◽  
Hyun Chul Choi ◽  
Kang Wook Kim
Keyword(s):  
Insertion Loss ◽  
High Performance ◽  
Bandpass Filter ◽  
Design Method ◽  
Characteristic Impedance ◽  
Wireless Systems ◽  
Bandpass Filters ◽  
Center Frequency ◽  
Harmonic Suppression ◽  
Low Loss

A design method of narrow bandpass filters (NBPFs) of 4–6% bandwidth with ultrawideband suppression of harmonic passbands, utilizing two cascaded step impedance resonators (SIRs) in a suspended stripline, is proposed in this paper. The proposed design utilized the characteristics of a suspended stripline, which provides a much higher characteristic impedance ratio as compared with that of the microstripline, enabling ultrawideband harmonic suppression. As an example of the NBPF, a filter with a passband center frequency f0 of 0.75 GHz and bandwidth of 5% was implemented and proved to suppress the harmonic passbands up to 13.5 f0. Since the proposed filter was implemented on the suspended stripline, the passband insertion loss was only −0.9 dB, which is low as compared with other previous designs. The proposed filter is a compact high-performance low-loss NBPF, which can be applicable to various wireless systems.

scholarly journals Ultra-wideband coplanar waveguide-to-asymmetric coplanar stripline transition from DC to 165 GHz

2018 ◽  
Vol 10 (8) ◽  
pp. 870-876
Author(s):  
Yunfeng Dong ◽  
Tom K. Johansen ◽  
Vitaliy Zhurbenko
Keyword(s):  
Aluminum Nitride ◽  
Insertion Loss ◽  
Coplanar Waveguide ◽  
Ultra Wideband ◽  
Coplanar Stripline

AbstractThis paper presents an ultra-wideband coplanar waveguide (CPW)-to-asymmetric coplanar stripline (ACPS) transition based on aluminum nitride (AlN) substrate. The concepts of designing CPW, ACPS, and CPW-to-ACPS transition are explained. In order to suppress parasitic modes, vias going through AlN substrate are added along the ground traces. The signal trace is tapered out and chamfered to reduce the reflection caused by the termination of ground trace. The CPW-to-ACPS transition is designed, fabricated, and measured in a back-to-back configuration. The fabricated CPW-to-ACPS transition can provide a bandwidth of 165 GHz with an associated insertion loss of 3 dB.

Angle and polarization-independent miniaturized UWB FSS design

2021 ◽  
pp. 1-9
Author(s):  
Yanning Yuan ◽  
Yuchen Zhao ◽  
Xiaoli Xi
Keyword(s):  
Design Method ◽  
Incident Angle ◽  
Stop Band ◽  
Single Layer ◽  
Wireless Systems ◽  
Frequency Selective Surface ◽  
Ultra Wideband ◽  
Band Frequency ◽  
Gain Enhancement ◽  
Polarization Independent

Abstract A single-layer ultra-wideband (UWB) stop-band frequency selective surface (FSS) has several advantages in wireless systems, including a simple design, low debugging complexity, and an appropriate thickness. This study proposes a miniaturized UWB stop-band FSS design. The proposed FSS structure consists of a square-loop and metalized vias that are arranged on a single layer substrate; it has an excellent angle and polarization-independent characteristics. At an incident angle of 60°, the polarization response frequencies of the transverse electric and magnetic modes only shifted by 0.003 f0 and 0.007 f0, respectively. The equivalent circuit models of the square-loop and metallized vias structure are analysed and the accuracy of the calculation is evaluated by comparing the electromagnetic simulation. The 20 × 20 array constitutes an FSS reflector with a unit size of 4.2 mm × 4.2 mm (less than one-twentieth of the wavelength of 3 GHz), which realizes an UWB quasi-constant gain enhancement (in-band flatness is <0.5 dB). Finally, the simulation results were verified through sample processing and measurement; consistent results were obtained. The FSS miniaturization design method proposed in this study could be applied to the design of passband FSS (complementary structure), antennas and filters, among other applications.

scholarly journals A Compact Four-Port Coplanar Antenna Based on an Excitation Switching Reconfigurable Mechanism for Cognitive Radio Applications

2019 ◽  
Vol 9 (15) ◽  
pp. 3157 ◽  
Author(s):  
O ◽  
Jin ◽  
Choi
Keyword(s):  
Cognitive Radio ◽  
High Frequency ◽  
Coplanar Waveguide ◽  
Low Frequency ◽  
Loop Antenna ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Uwb Antenna ◽  
High Isolation ◽  
Loop Antennas

In this paper, we propose a compact four-port coplanar antenna for cognitive radio applications. The proposed antenna consists of a coplanar waveguide (CPW)-fed ultra-wideband (UWB) antenna and three inner rectangular loop antennas. The dimensions of the proposed antenna are 42 mm × 50 mm × 0.8 mm. The UWB antenna is used for spectrum sensing and fully covers the UWB spectrum of 3.1–10.6 GHz. The three loop antennas cover the UWB frequency band partially for communication purposes. The first loop antenna for the low frequency range operates from 2.96 GHz to 5.38 GHz. The second loop antenna is in charge of the mid band from 5.31 GHz to 8.62 GHz. The third antenna operates from 8.48 GHz to 11.02 GHz, which is the high-frequency range. A high isolation level (greater than 17.3 dB) is realized among the UWB antenna and three loop antennas without applying any additional decoupling structures. The realized gains of the UWB antenna and three loop antennas are greater than 2.7 dBi and 1.38 dBi, respectively.

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