Compact Bandstop Filters with Extended Upper Passbands

Alkanhal, Majeed A. S.

doi:10.1155/2008/356049

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…In particular, for odd n, according to (5), the impedance of central step is Z 0 . It has also been shown that minimum characteristic impedance occurred at 2nd step for n ¼ 5, 6, 7, and 8, 3rd step for n ¼ 9, 10, 11, and 12, etc.…”

Section: I U N I T C E L Lmentioning

confidence: 99%

“…It also means that such design is complementary to other designs referenced in this paper. Namely, designs from references [2, 7, and 9] enable narrow stop bandwidths, up to 10%, while designs from references, [3][4][5][6] and [8] enable stop bandwidths up to 40%. Table 3.…”

Section: I I D E S I G N O F B S Fmentioning

confidence: 99%

“…The method most frequently used to extend the upper passbands of BSFs is to shift the higher-order resonances higher in frequency utilizing parallel coupled line, stepped-impedance or lumped element-loaded resonators [2][3][4][5][6][7][8]. Using these techniques upper passbands extended up to 6 f 0 are reported for narrow band and moderate band BSFs.…”

Section: Introductionmentioning

confidence: 99%

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Band-stop filter with suppression of requested number of spurious stopbands

Nešić

Kolundžija

2016

Int. J. Microw. Wireless Technol.

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Band-stop filter with suppression of requested number of spurious stopbands dusan a. nesic 1 and branko m. kolundzija 2 Design method for band-stop filters (BSFs) that suppress a requested number of spurious bandstops and reduce ripples in the passbands below 1 dB is proposed. BSF is designed in a form of a cascade of cells, each consisting of steps of equal electrical length, where the number of steps is used to control the number of suppressed spurious bandstops. Analytical formulas are developed that enable initial design of BSF for a given central frequency, depth, and bandwidth of the stopband. Varying the minimum characteristic impedances of initial cells, through an optimization using circuit simulation, the ripples in passbands are reduced below 1 dB. Using the proposed theory, three filters in microstrip technology, with suppression of 3, 5, and 7 spurious stopbands respectively, were designed, fabricated, and measured. Good agreement between simulated and measured results has been observed. The proposed design can be recommended for filters having broad stop bandwidths, between 40 and 100%.

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Section: I U N I T C E L Lmentioning

confidence: 99%

Section: I I D E S I G N O F B S Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Band-stop filter with suppression of requested number of spurious stopbands

Nešić

Kolundžija

2016

Int. J. Microw. Wireless Technol.

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“…To increase the number of PUF structures that can exist on a PCB, a compact solution is needed. A number of structures have been proposed that show the decrease in size that PCB resonators have undergone over the years [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

NotchPUF: Printed Circuit Board PUF Based on Microstrip Notch Filter

Martin

Plusquellic

2020

Cryptography

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Physical Unclonable Functions (PUFs) are primitives that are designed to leverage naturally occurring variations to produce a random bitstring. Current PUF designs are typically implemented in silicon or utilize variations found in commercial off-the-shelf (COTS) parts. Because of this, existing designs are insufficient for the authentication of Printed Circuit Boards (PCBs). In this paper, we propose a novel PUF design that leverages board variations in a manufactured PCB to generate unique and stable IDs for each PCB. In particular, a single copper trace is used as a source of randomness for bitstring generation. The trace connects three notch filter structures in series, each of which is designed to reject specific but separate frequencies. The bitstrings generated using data measured from a set of PCBs are analyzed using statistical tests to illustrate that high levels of uniqueness and randomness are achievable.

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“…Note that the above-mentioned band-stop filters [11][12][13][14][15][16][17][18][19][20] cannot overcome the disadvantage of the repeating stop band at odd multiples of the center frequency of fundamental stop band. In order to remove the limitation of the second harmonic response in the conventional bandstop filters, two-section stepped-impedance stubs [21,22] and crosscoupled stepped-impedance resonators [23] are proposed in the design of band-stop filters with extended upper passbands.…”

Section: Introductionmentioning

confidence: 99%

A Coupled-Line Band-Stop Filter With Three-Section Transmission-Line Stubs and Wide Upper Pass-Band Performance

Wu¹,

Liu²

2011

PIER

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Abstract-A novel band-stop filter with wide upper pass-band performance is proposed and discussed in this paper. This bandstop filter includes two three-section transmission-line stubs and a parallel coupled-line section. Because three-section transmission-line stubs and coupled-line section are used, this filter not only features good band-stop filtering property, but also has wide upper pass band. In order to verify this new filter circuit structure and its corresponding design theory, three groups of numerical examples are demonstrated. Finally, two practical band-stop filters using common microstrip technology are designed, simulated and measured. The simulated and measured results indicate that both the coupled-line section with weak coupling and two three-section stubs can improve the upper pass-band performance. Furthermore, the measured results of the second fabricated microstrip band-stop filter (Filter B) show that the 20-dB insertion-loss band-stop bandwidth at 0.46 GHz is 90 MHz and the 1.2-dB transmission coefficient upper pass band is from 0.66 GHz to 2.52 GHz. Thus, the highest pass-band frequency is extended to larger than five times of the operating center frequency of stop band.

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Compact Bandstop Filters with Extended Upper Passbands

Cited by 7 publications

References 11 publications

Band-stop filter with suppression of requested number of spurious stopbands

Band-stop filter with suppression of requested number of spurious stopbands

NotchPUF: Printed Circuit Board PUF Based on Microstrip Notch Filter

A Coupled-Line Band-Stop Filter With Three-Section Transmission-Line Stubs and Wide Upper Pass-Band Performance

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