A CRLH TL Transmission Line Structure and its Application to Bandpass Filter Design

2013 ◽  
Vol 446-447 ◽  
pp. 865-868
Author(s):  
Ya Lin Guan ◽  
Xin Kun Tang ◽  
Shi Lei Zhou
Keyword(s):  
Transmission Line ◽  
Insertion Loss ◽  
Bandpass Filter ◽  
Filter Design ◽  
Left Handed ◽  
Relative Bandwidth ◽  
Low Pass ◽  
Band Pass ◽  
Low Insertion Loss ◽  
High Pass

In this paper, a novel bandpass filter (BPF) using the composite right/left-handed transmission line (CRLH-TL) theory is presented.The composite right/left-handed TL with the high-pass characters of left-handed transmission line (LH-TL) and the low-pass characters of right-handed transmission line (RH-TL) are used to construct the bandpass filter.Using this theory,we design a bandpass filter which have an obvious band pass response with a wide passband range from 5.1to 12.9GHz and a low insertion loss of less than 3.1dB. The relative bandwidth is close to 110%. Simulation using ADS demonstrated the viability of the approach.

A semi-lumped microstrip UWB bandpass filter

2009 ◽  
Vol 1 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Darine Kaddour ◽  
Jean-Daniel Arnould ◽  
Philippe Ferrari
Keyword(s):  
Group Delay ◽  
Bandpass Filter ◽  
Filter Design ◽  
Sensitivity Study ◽  
Critical Parameters ◽  
Center Frequency ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
High Pass

In this paper, a miniaturized bandpass filter for ultra-wide-band applications is proposed. It is based on the embedding of high-pass structures in a low-pass filter. A semi-lumped technology combining surface-mounted capacitors and transmission lines has been used. The filter design rules have been carried out. Furthermore, two filters having a 3-dB fractional bandwidth of 142 and 150%, centered at 0.77 and 1 GHz, respectively, have been realized for a proof of concept. Measured characteristics, in good agreement with simulations, show attractive properties of return loss (|S11| <−18 dB), insertion loss (<0.3 dB), and a maximum group delay and group delay variation of 2 and 1.3 ns, respectively. A distributed filter based on the same low-pass/high-pass approach has been also realized and measured for comparison. The size reduction reaches 85% for the semi-lumped filter, and its selectivity is improved with a shape factor of 1.3:1 instead of 1.5:1. The semi-lumped filter's drawback is related to a smaller rejection bandwidth compared to the distributed one. To improve the high-frequency stopband, an original technique for spurious responses suppression based on capacitively loaded stubs has been proposed. Even if the performances do not reach that obtained for the distributed approach, with this technique spurious responses are pushed until eight times the center frequency. A sensitivity study vs. critical parameters has also been carried out, showing the robustness of the design.

scholarly journals Dual band Stepped Impedance Interdigital Microstrip Filter for LTE Bands

2019 ◽  
Vol 4 (7) ◽  
pp. 28-30
Author(s):  
William Johnson ◽  
Cavin Roger Nunes ◽  
Savio Sebastian Dias ◽  
Siddhi Suresh Parab ◽  
Varsha Shantaram Hatkar
Keyword(s):  
Insertion Loss ◽  
Bandpass Filter ◽  
Dual Band ◽  
Band Pass Filter ◽  
Coupled Resonators ◽  
Microstrip Filter ◽  
Resonant Frequencies ◽  
Pass Filter ◽  
Band Pass ◽  
Low Insertion Loss

In this paper, a dual band microstrip bandpass filter has been proposed utilizing three edge coupled resonators, interdigital stubs and DGS technique. To enhance the coupling degree, two interdigital coupled feed lines are employed in this filter. The suppressing cell consists of stepped impedance ladder type resonators, which provides a wide stopband. The proposed suppressing cell has clear advantages like low insertion loss in the passband and suitable roll off. The frequency response of the filter looks like a standard dual band band-pass filter. The filter exhibits a dual passband with resonant frequencies at 2.2GHz and 3.45GHz covers LTE1 and LTE22 bands.

Improved RF Metamaterial Band-Pass Filter Design Using CSRR Structures on LCP Substrate

2015 ◽  
Vol 2015 (DPC) ◽  
pp. 001016-001047
Author(s):  
Christopher James ◽  
Robert N. Dean
Keyword(s):  
Frequency Response ◽  
Filter Design ◽  
Ring Resonators ◽  
Band Pass Filter ◽  
Split Ring ◽  
Pass Filter ◽  
Signal Line ◽  
Low Pass ◽  
Band Pass ◽  
High Pass

In the past decade, the emergence of man-made structures with unusual electromagnetic properties not seen in nature—commonly known as “metamaterials”—has generated much interest in designing filters, antennas, lenses, and other devices based on negative values of permittivity (ε) and permeability (μ). Manipulating negative values of these electromagnetic parameters has found applications in communication technology and cloaking research by taking advantage of interesting phenomena such as a negative index of refraction and the reverse Doppler Effect. RF and microwave filters with different frequency responses (low-pass, high-pass, band-pass, and band-stop) can be realized by varying microstrip signal line shapes at a frequency of interest due to the fact that the metamaterial frequency response is dependent on the physical dimensions of the structures. For example, the center frequency of a filter can be determined by adjusting the physical dimensions of metamaterial building blocks called split-ring resonators (SRR) or their duals, complementary split-ring resonators (CSRR). To further metamaterial applications, however, non-planar surfaces and effects of curvature on frequency response must also be considered. In this work, an RF metamaterial filter is presented to demonstrate an improvement in the band-pass frequency response from a previous design at Auburn University by enhancing the upper band behavior of the filter. This is achieved by modifying the metamaterial design on the microstrip device to incorporate new additions to the signal line to combine both high-pass and low-pass metamaterial design concepts, resulting in a band-pass response. The filter is designed using a liquid crystal polymer (LCP) slab as a substrate due in part to its dielectric properties, but also to investigate the filter's performance on a flexible structure. An exploration into the roles of different signal line and CSRR dimensions in filter design is given, and a microstrip filter designed using ANSYS HFSS is shown along with simulation results to verify band-pass filter response. LCP was selected due to its excellent RF properties, its resistance to moisture absorption, and its ability to be micromachined.

Highly compact UWB bandpass filter based on composite right/left-handed transmission line and meander fractal like ring slot in ground

2016 ◽  
Vol 9 (5) ◽  
pp. 1037-1044
Author(s):  
Babu Lal Shahu ◽  
Srikanta Pal ◽  
Neela Chattoraj ◽  
Dileep Kumar Upadhyay
Keyword(s):  
Transmission Line ◽  
Insertion Loss ◽  
Return Loss ◽  
Bandpass Filter ◽  
Ground Plane ◽  
Equivalent Circuit Model ◽  
Ultra Wideband ◽  
Left Handed ◽  
Conductor Strip ◽  
Better Than

An ultra-wideband (UWB) highly compact bandpass filter with extremely high passband bandwidth is presented. The proposed structure is made using three-staged stepped-impedance lines and a composite right/left-handed transmission line (CRLH-TL) synthesized with meander fractal like ring slot in the ground and series capacitive gap in conductor strip. The capacitive gap in conductor strip and meander fractal like ring slot in the ground plane play major role for controlling the lower and higher cut-off frequencies. The equivalent circuit model of proposed filter is demonstrated and lumped parameters are extracted. A prototype is fabricated to experimentally validate the performance of proposed filter. The proposed UWB filter has extremely wide −10 dB return loss passband bandwidth from 3.14 to 18.26 GHz with relative bandwidth of 142% and insertion loss better than 0.5 dB. Also it achieves a wide upper-stopband from 19.7 to 24.4 GHz with insertion loss better than 13.0 dB, return loss <1.5 dB and sharpened rejection skirts outside the passband at both lower and upper frequency ends. Good agreement is found between simulated and measured results with measured group delay variation in the passband <0.65 ns.

scholarly journals Extended Composite Right/Left-Handed Transmission Line and Dual-Band Reactance Transformation

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Yuming Zhang ◽  
Barry Spielman
Keyword(s):  
Transmission Line ◽  
Bandpass Filter ◽  
Dispersion Analysis ◽  
Dual Band ◽  
Prototype Filter ◽  
Left Handed ◽  
Low Pass ◽  
Physical Insight ◽  
Dual Pass ◽  
Insight Into

An extended composite right/left-handed transmission line is introduced, and its dual-band bandpass filter characteristics are explored. Novel reactance transformations, derived from this transmission line, are formulated to transform a low-pass prototype filter into a dual-band bandpass filter with arbitrary dual pass bands, well-defined in-band attenuation ripples, and high out-of-band rejection. The physical insight into such a dual-band bandpass filter is provided with a dispersion analysis. The transformations are verified by simulated results for dual-band bandpass filters.

scholarly journals A Suspended Stripline Frequency Tripler Using a Left-Handed Nonlinear Transmission Line

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
In Bok Kim ◽  
Hongjoon Kim ◽  
Hyun Chul Choi ◽  
Kang Wook Kim
Keyword(s):  
Transmission Line ◽  
Insertion Loss ◽  
Nonlinear Transmission Line ◽  
Pass Filter ◽  
Third Harmonic ◽  
Nonlinear Transmission ◽  
Left Handed ◽  
Varactor Diodes ◽  
Harmonic Conversion ◽  
High Pass

A suspended stripline frequency tripler using a left-handed nonlinear transmission line (LH NLTL) is presented. The proposed tripler using the LH NLTL is composed of a series of varactor diodes, shunt inductances, and a high-pass filter implemented with suspended stripline (SSL). An ultrawideband microstrip-to-suspended stripline transition is also utilized. The fabricated LH NLTL provides the minimum insertion loss of 1.7 dB and the maximum insertion loss of 4.7 dB for a wide frequency band from 2.6 to 18 GHz. As a tripler, the measured minimum third harmonic conversion loss is 15.3 dB at an input frequency of 2.4 GHz and typically 17 dB from 2 to 3.1 GHz.

scholarly journals A Compact Bandpass Filter Using A T-Shaped Loaded Open-ended Stub Resonator

2018 ◽  
Vol 10 (3) ◽  
pp. 867 ◽  
Author(s):  
Ali Nyangwarimam Obadiah ◽  
Mohamad Rijal Hamid ◽  
Mohamad Kamal Abd Rahim ◽  
Noor Asniza Murad
Keyword(s):  
Computer Simulation ◽  
Transmission Line ◽  
Insertion Loss ◽  
Bandpass Filter ◽  
Simulation Technology ◽  
Transmission Zero ◽  
Feed Line ◽  
Low Insertion Loss

This paper proposes a compact bandpass filter using a loaded open-ended T-shaped stub. The open-ended T-shaped stub is loaded with vertical resonators placed across. The key advantage of using vertical resonators in the design is the simplicity and low insertion loss it provides. The structure used is an open-ended stub attached on one end to the transmission line (λ/2) to form a T-shaped resonator (λ/4) having vertical resonators placed across. The vertical resonator position alters the position at which the transmission zero occurs. A pair of the T-shaped resonator is placed on parallel sides of the feed line. The proposed filter is designed with the aid of Computer Simulation Technology Microwave Studio Software. The proposed concept is verified by designing filters with four different vertical resonator positions. The filter possesses a good rejection and low insertion loss of &lt; 2dB with Chebyshev response. This filter is suited for modern-day communication applications since it shows good rejection of out of band signals.

ON THE GENERALIZATION OF SECOND-ORDER FILTERS TO THE FRACTIONAL-ORDER DOMAIN

2009 ◽  
Vol 18 (02) ◽  
pp. 361-386 ◽  
Author(s):  
A. G. RADWAN ◽  
A. S. ELWAKIL ◽  
A. M. SOLIMAN
Keyword(s):  
Fractional Order ◽  
Filter Design ◽  
Second Order ◽  
Pass Band ◽  
Capacitive Probe ◽  
Low Pass ◽  
Band Pass ◽  
First Time ◽  
High Pass ◽  
Order Domain

This work is aimed at generalizing the design of continuous-time second-order filters to the non-integer-order (fractional-order) domain. In particular, we consider here the case where a filter is constructed using two fractional-order capacitors both of the same order α. A fractional-order capacitor is one whose impedance is Zc = 1/C(jω)α, C is the capacitance and α (0 < α ≤ 1) is its order. We generalize the design equations for low-pass, high-pass, band-pass, all-pass and notch filters with stability constraints considered. Several practical active filter design examples are then illustrated supported with numerical and PSpice simulations. Further, we show for the first time experimental results using the fractional capacitive probe described in Ref. 1.

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