New Theory and Design for Hairpin-Line Filters

Gysel, U.H.

doi:10.1109/tmtt.1974.1128273

Cited by 62 publications

(34 citation statements)

References 5 publications

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“…However, further miniaturization becomes more difficult for this filter. Planar filters using highpermittivity ceramic substrate provide good miniaturization ability [2][3][4][5][6]. Therefore, there has been much research conducted on planar filters and their components.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Microstrip Compact Bandpass Filter Using High Permittivity Substrate

Hsu

Ho²,

Hsu³

2009

PIER Letters

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Abstract-A four-pole elliptic function compact bandpass filter is designed by using interdigital hairpin resonator and step-impedance hairpin resonator.The miniaturized band-pass filter is also implemented using high permittivity dielectric substrate. The fullwave simulator IE3D is used to design the compact hairpin resonator, and to calculate the coupling coefficient of the basic coupling strictures. The responses of the fabricated filters using Al 2 O 3 (ε r = 9.7, Q × f = 350000 GHz) and 0.6Sm(Co 1/2 Ti 1/2 )O 3 -0.4CaTiO 3 (ε r = 37, Q × f = 43000 GHz) dielectric substrates are designed at a center frequency of 2 GHz. The size of the compact hairpin filter using 0.6Sm(Co 1/2 Ti 1/2 )O 3 -0.4CaTiO 3 ceramic substrate, as compared to that of a compact hairpin filter using Al 2 O 3 ceramic substrate, is reduced in size by 45%. The compact size and good agreement have been obtained between simulations and implementation results.

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Section: Introductionmentioning

confidence: 99%

Hybrid Microstrip Compact Bandpass Filter Using High Permittivity Substrate

Hsu

Ho²,

Hsu³

2009

PIER Letters

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“…The length of parallel coupled filter is too long and it further increases with the order of filter. To solve this problem, hairpin-line filter using folded λ/2 resonator structures were developed [8,9]. The traditional design of the hairpin topology has the advantage of compact structure, but it has the limitation of wider bandwidth and poor skirt rate due to unavoidable coupling [10].…”

Section: Introductionmentioning

confidence: 99%

Novel Microstrip Hairpinline Narrowband Bandpass Filter Using via Ground Holes

Hasan¹,

Nadeem²

2008

PIER

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Abstract-In this paper, we present a novel improved hairpinline microstrip narrowband bandpass filter with via ground holes. The new filter design methodology is derived from conventional hairpinline filter design. This design methodology incorporates use of λ/8 resonators, thereby reducing the size of the filter by 35% as compared to the conventional design. An analysis is presented to show the effects of tap point height and microstrip width on fundamental parameters of filter and subsequent relationships are developed. Through use of via ground holes and a wider microstrip line for resonators, 3 dB Fractional Bandwidth (FBW) less than 2%, Insertion Loss (IL) less than 1.6 dB and Return Loss (RL) better than 40 dB is achieved with midband center frequency 1 GHz. Spurious response suppression is achieved till 3f 0 . Robustness of this design approach is demonstrated by designing filters on two more substrates having ε r 2.17 and 9.2. As low as 0.48% FBW was achieved by using different substrates. The design approach is successfully tested for center frequency upto 2 GHz beyond which folding the resonator becomes practically difficult. Finally, a bandpass filter is designed with this design methodology and fabricated using FR4 substrate. S-parameter measurements show a good agreement with the simulated results. 394Hasan and Nadeem

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“…Nevertheless, lump or MIM capacitors and via holes or special arrangement for grounding are usually required for designing this type of filters. The tapped couplings to the input and output ports have extra advantages [1,2] in generating two extra independent transmission zeros. In [3], this skill has been fully utilized to design a slotted resonators filter with upper stop-band being extended to eight times the pass-band frequency.…”

Section: Introductionmentioning

confidence: 99%

“…However, further miniaturization becomes more difficult for this filter. Planar filter using high-permittivity ceramic substrate, such as parallel-coupled filter [5], interdigital filter [6], combline filters [1], and hairpin filters [2], provide good miniaturization ability.…”

Section: Introductionmentioning

confidence: 99%