Bandwidth Enhancement and Frequency Scanning Array Antenna Using Novel UWB Filter Integration Technique for OFDM UWB Radar Applications in Wireless Vital Signs Monitoring

Rahman, MuhibUr; Naghshvarianjahromi, Mahdi; Mirjavadi, Seyed Sajad

doi:10.3390/s18093155

Cited by 41 publications

(30 citation statements)

References 23 publications

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“…passband is controlled by the physical dimensions of the parameters given in the denominator of Equation (23).…”

Section: Calculating Resonant Frequenciesmentioning

confidence: 99%

“…The middle frequency can be tuned with the help of impedance ratios and length ratios of the loaded open stubs. Also, a wideband bandpass filter is designed in [23,24] having the capability to operate from 3.1 to 10.6 GHz frequency range. Maximum transmission zeros are achieved in [25] by analyzing the loaded and unloaded Q-factor in triple bandpass filter.…”

Section: Introductionmentioning

confidence: 99%

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A Very Compact Quintuple Band Bandpass Filter Using Multimode Stub Loaded Resonator

Sami¹,

Rahman²

2019

PIER C

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This paper presents a very compact quintuple band bandpass filter utilizing multimode stub loaded resonator. A single symmetric resonator is loaded with a short ended stub at the middle along with four pairs of open-ended stubs. The open-ended stubs are folded towards each other in order to make the design more compact and improve the selectivity of the bandpass filter. Because of symmetry, the circuit is analyzed with the help of even-odd mode analysis. The proposed bandpass filter operates

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“…passband is controlled by the physical dimensions of the parameters given in the denominator of Equation (23).…”

Section: Calculating Resonant Frequenciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Very Compact Quintuple Band Bandpass Filter Using Multimode Stub Loaded Resonator

Sami¹,

Rahman²

2019

PIER C

Self Cite

View full text Add to dashboard Cite

show abstract

“…Using drones for wireless communication and aerial base stations are other exemplary topics of research [6][7][8][9]. Although there has been a lot of previous research on the integration of wireless sensors, radars, or IoT devices with UAV, including drones, most of the work has focused on the connectivity of UAV using the currently existing antenna structures [10,11]. Since the uniqueness of UAV applications is emphasized by the physical location of communication devices, the conventional antenna structures or previously reported reconfigurable antenna structures [12][13][14][15][16][17][18][19][20][21][22] cannot be effectively used.…”

Section: Introductionmentioning

confidence: 99%

Tilted-Beam Switched Array Antenna for UAV Mounted Radar Applications with 360° Coverage

et al. 2019

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A highly efficient antenna array for unmanned aerial vehicle (UAV) mounted radar applications with a tilted-beam characteristic and a 360° beam coverage is proposed in this paper. The proposed array antenna is configured by four planar super J-pole antennas with 2-dimensional ground reflectors. Each super J-pole antenna element provides a high directivity where the peak gain is tilted about 45° facing toward the ground from the bottom of a UAV body. Thus, the air-to-ground communication difficulty due to the altitude difference between the UAV and ground targets can be effectively solved. Further, the four super J-pole elements with a switched operation can cover the whole 360° areas around the UAV while high antenna gain is maintained. To verify the performance, the proposed structure was implemented at 5.9 GHz with an overall volume of 0.88 × 0.88 × 0.83 λo3. The measured 10-dB impedance bandwidths for all four antenna elements were better than 27.2% and the isolation among the four antenna ports was also always better than 13 dB. The measured peak gain was better than 7.4 dBi and tilted at 45° in the elevation angle. Lastly, the measured half power beam widths in elevation and azimuth planes were more than 60° and 87°, respectively.

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“…Multi-mode stub loaded quarter wave resonators were utilized to realize tri-band filters for wireless applications [13]. The author in [14] offers a very compact wide band bandpass filter using quasi-elliptic resonator in combination with DGS. The presented filter is advantageous in terms of insertion loss, 3-dB fractional bandwidth, and with two transmission zeros.…”

Section: Introductionmentioning

confidence: 99%

Design of compact tri and quad band band-pass filters using stub loaded resonators for wireless applications

2019

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A compact tri and quad band band-pass filters (BPFs) utilizing stub loaded resonators is presented for wireless applications. The proposed resonator has been designed and analyzed using even-odd mode analysis due to its symmetrical geometry. Open-ended stubs are loaded at an appropriate position in the dual-mode resonator to achieve tri and quad passbands. To reduce the circuit size and create transmission zeros at our desired frequencies, a symmetrical meandered shape resonator is loaded with open-ended identical stubs which are bent towards each other. The proposed BPFs are tune to operate at GSM (900 MHz), LTE (2300 MHz), WiMAX (3.5 GHz), and WLAN (5.4 GHz) bands. Significant improvements are observed in terms of circuit size, 3-dB fractional bandwidth, insertion loss, and transmission zeros. To check the validity of the proposed tri and quad BPFs, these are simulated, fabricated and measured. The simulated and measured results are compared and strong agreement is observed. The proposed filters can be prospective candidates for wireless communication applications.Keywords Stub loaded resonators (SLR) · Band-pass filters (BPFs) · Triple BPF · Quad BPF · Even and odd mode analysis · WLAN (wireless local area network) · WiMAX (worldwide interoperability for microwave acces) · LTE (long term evolution)

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Bandwidth Enhancement and Frequency Scanning Array Antenna Using Novel UWB Filter Integration Technique for OFDM UWB Radar Applications in Wireless Vital Signs Monitoring

Cited by 41 publications

References 23 publications

A Very Compact Quintuple Band Bandpass Filter Using Multimode Stub Loaded Resonator

A Very Compact Quintuple Band Bandpass Filter Using Multimode Stub Loaded Resonator

Tilted-Beam Switched Array Antenna for UAV Mounted Radar Applications with 360° Coverage

Design of compact tri and quad band band-pass filters using stub loaded resonators for wireless applications

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