Modeling and simulation of novel ultra-narrowband miniature microstrip filters for mobile and wireless critical applications

Hejazi, Z.M.; Omar, A.A.

doi:10.1002/mop.20715

Cited by 9 publications

(12 citation statements)

References 4 publications

(3 reference statements)

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“…The frequency band allotted for GPS receiver system is 1.559 GHz-1.610 GHz [1]. According to the need of narrowband BPFs in terms of better performance or size miniaturization various designs have been proposed [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The stepped impedance parallel coupled resonators are used for suppression of harmonics in BPF [2].…”

Section: Introductionmentioning

confidence: 99%

Design of Radial Microstrip Band Pass Filter With Wide Stop-Band Characteristics for GPS Application

Singh¹,

Tiwary²,

Gupta³

2015

PIER C

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Abstract-In this paper, a novel compact band pass filter (BPF) is proposed for Global Positioning System (GPS) receivers. The proposed BPF configuration is composed of a low pass filter (LPF) section formed by the coupled line transformer connected with a radial stub and two short circuited stubs embedded within the 50 Ω microstrip line connecting the input/output (I/O) port of LPF. The lumped equivalent model of proposed BPF is also presented and analyzed. Simulation as well as experimental results shows very good in-band (pass-band) and out-of-band (≈ 7f c (centre frequency)) characteristics. The 3 dB fractional bandwidth (FBW) is 3.2% of f c , thus satisfying the GPS receiver requirement and the minimum insertion loss (IL) in pass-band is 1.28 dB.

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Section: Introductionmentioning

confidence: 99%

Design of Radial Microstrip Band Pass Filter With Wide Stop-Band Characteristics for GPS Application

Singh¹,

Tiwary²,

Gupta³

2015

PIER C

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“…standard 2-pole filter where the separation between the resonators is believed to be dominant for controlling the coupling coefficients. The separation in the example filter reported in [28], is varied and the split frequencies can be seen in the computed transmission frequency responses illustrated in Fig. 7.…”

Section: Validation Of the Modelmentioning

confidence: 99%

“…The extracted coupling coefficients (using (6) and (9)) of the example filter [28] versus the separation normalized to conductor width. where M 12 = M 21 when the current in both segments has the same frequency.…”

Section: Geometry For Minimizing the Coupling Coefficientmentioning

confidence: 99%

“…This capacitance alone can be easily adjusted or optimized by the network (circuit model) simulation tool until the split resonances form a flat passband with the specified ripple. If the losses are to be taken into account, which is the case in critical applications [28,29], the coupling coefficient model was modified for better accuracy as outlined in the next section.…”

Section: Modeling and Synthesis Of The Filter Circuitsmentioning

confidence: 99%

“…In previous works [28,29], filters with F BW s of 0.08%, 0.05% and 0.02% at wireless frequency, have been initially reported using a new approach in microstrip geometries. Detailed investigation of such type of filters with experimental verification was still needed.…”

Section: Introductionmentioning

confidence: 99%

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Em Full-Wave Analysis and Testing of Novel Quasi-Elliptic Microstrip Filters for Ultra Narrowband Filter Design

Hejazi¹,

Scardelletti²,

Keuls³

et al. 2008

PIER

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Abstract-A new class of microstrip filter structures are designed, optimized, simulated and measured for ultra-narrowband performance essential to the wireless industry applications. More accurate model of the coupling coefficient is outlined and tested for narrowband filter design. Two sample filters are fabricated and measured to verify the simulations and prove the concept. The idea behind the new designs is based on minimizing the parasitic couplings within the resonators and the inter-resonator coupling of adjacent resonators. A reduction of the overall coupling coefficient is achieved even with less resonator separation which is a major issue for compactness of such filters. The best new designs showed a simulated fractional bandwidth (F BW ) of 0.05% and 0.02% with separations of S = 0.63 mm and S = 0.45 mm, respectively. The measured filters tend to have even narrower F BW than the simulated, though its insertion loss deteriorates, possibly due to mismatch at the interface with external circuitry and poor shielding effect of the test platform. The investigated 2-pole filters are accommodated on a compact area of a nearly 0.6 cm 2 . An improvement of tens of times of order in narrowband performance is achieved compared to reported similar configuration filters and materials. A sharp selectivity and quasi-elliptic response are also demonstrated with good agreement in both simulations and measurements. In all filters, however, the study shows that the narrower the F BW , the larger the insertion loss (IL) and the worse the return loss (RL). This is confirmed by measurements.

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A new model to calculate the coupling coefficient for more accurate filter design and further development of narrowband-filter performance

Hejazi¹,

Jiang²

2005

Microw. Opt. Technol. Lett.

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between the ground lines of 156 m demonstrated similar improvement. The results from the 60-m-wide microstrip lines suggest that maintaining a constant line width so that the probe pad structure is indistinguishable from the transmission line, if possible, is best. This allows direct probing of the transmission line without introducing error during the removal of probe-pad parasitics or correction for microstrip-width variations.In either situation, it is then possible to implement the calibration-comparison method by inserting an impedance transformer to map the reference impedance of the measurement into the reference impedance Z 0 of the multiple, redundant line standards and the following the procedure given in [7][8][9]. Investigations continue to determine if following this approach results in a more accurate characteristic impedance determination.The author thanks Dr. Mark Gouker from MIT Lincoln Laboratory for fabricating the transmission-line structures and providing all of the scattering-parameter measurements. More recent works show the importance of achieving ever narrower bandwidths (up to 0.11%) and higher out-of-band rejection required in the wireless communications industry [13][14][15], and even in radio astronomy [16]. An HTS microstrip filter with lumped-element realization has been reported to achieve FBW of 0.014% at a midband frequency of 700 MHz [15]. A previous recent work [17], showed a possible FBW of up to 0.05% achieved at wireless frequencies using a new version of folded spiralmicrostrip geometry, where the current directions in all adjacent sections of a resonator are forced to be opposite to each other so as to minimize parasitic internal couplings and hence reduce the overall coupling coefficient. However, the design of planar ultranarrowband filters with FBW of less than 0.1% generally still face the following constraints: a very weak coupling with a reasonably smaller separation between resonators in order to maintain a small circuit size. The other challenge is to identify and control the required electric and magnetic nonadjacent cross-couplings in or- der to achieve a highly selective elliptic function response with transmission zeros near the passband. Also, it was found that the standard model used for extracting the coupling coefficient between two resonators or two degenerate modes (in dual-mode filters) can not be accurate when the quality factor Q is not too high. Thus, a more accurate model for the coupling coefficient is required to take the circuit losses into account when designing narrowband filters.In this paper, a method for accurate calculation of the coupling coefficient between two degenerate modes (in dual-mode filters) or two resonators in standard filters is presented and compared with the standard model using two example filters with different configurations and coupling types: one is fabricated and tested using a conventional conductor, the other is designed and simulated using a fictitious HTS. The idea for improving the narrowband performance to achiev...

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Modeling and simulation of novel ultra-narrowband miniature microstrip filters for mobile and wireless critical applications

Cited by 9 publications

References 4 publications

Design of Radial Microstrip Band Pass Filter With Wide Stop-Band Characteristics for GPS Application

Design of Radial Microstrip Band Pass Filter With Wide Stop-Band Characteristics for GPS Application

Em Full-Wave Analysis and Testing of Novel Quasi-Elliptic Microstrip Filters for Ultra Narrowband Filter Design

A new model to calculate the coupling coefficient for more accurate filter design and further development of narrowband-filter performance

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