The Round-Ended Design and Measurement of All Symmetric Edge-Coupled Bandpass Filter

Yang, Baohua; Mehdi, Ghulam; Hu, Anyong; Xie, Yan; Yao, Xin; Zhang, Jin; Zheng, Cheng; Miao, Jungang

doi:10.2528/pierc13012609

Cited by 11 publications

(8 citation statements)

References 13 publications

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“…Measurements were carried out at a Vector Network Analyser Agilent N5225A. All measurement results are calibrated by TRL [8,16] method for de-embedding. For the tuning of the wave guide BPF, the stress of the two halves of the filter can be adjusted just as in Fig.…”

Section: Measurement Resultsmentioning

confidence: 99%

Design of H-Plane Inductance Diaphragm Waveguide Band-Pass Filter for Millimeter Imaging Frontend

Yang¹,

Li²,

Zhang³

et al. 2014

PIER C

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Abstract-This study presents an equivalent circuit and a design of an H-plane waveguide bandpass filter (BPF) with chamfer. Traditionally, only thin inductive diaphragm with no chamfers considered in the direct-coupled cavity theory, but this will lead to difficulties in the BPF manufacturing. During manufacturing process the chamfer cannot be avoided, and its equivalent circuit and effects on frequency shifting are investigated in this paper. A new design method is proposed in order to compensate the effect of chamfer in the half-wavelength resonator connection between the inductance diaphragm and the waveguide. A modified empirical formula and corresponding procedure are provided for designing such filters. The working center frequency and 3 dB bandwidths (BW) are simulated considering different chamfer radius. The simulated center frequencies are 18 GHz, 26 GHz, 34 GHz and 42 GHz, and BWs are 2.265%, 2.5%, 10%, 15% and 20%. Results show that the modified formula, which conforms better with the simulated results, is superior to the traditional formula. Two H-plane waveguide BPFs are manufactured with center frequency 26 GHz with 2.5% BW and 34 GHz with 2.265% BW. The results of the modified formula are in good agreement with measured ones.

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Section: Measurement Resultsmentioning

confidence: 99%

Design of H-Plane Inductance Diaphragm Waveguide Band-Pass Filter for Millimeter Imaging Frontend

Yang¹,

Li²,

Zhang³

et al. 2014

PIER C

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“…As shown in Fig. 4, the ultra-wideband antenna has a bandwidth of 36% (18)(19)(20)(21)(22)(23)(24)(25)(26), circular polarization, and a VSWR of 1.4, 1.8, and 1.6 at the radiometer typical operating frequencies, respectively. The performance of the antenna demonstrating the beamwidth of 10-14 • , gain of 19-25 dB, side lobe of less than 20 dB, and back lobe of less than 30 dB over the radiometer's frequency range.…”

Section: Antennamentioning

confidence: 99%

“…[23][24][25]. Each RF bandpass filter is shared by two adjacent RF bands to reduce the complexity of the RF front-end.…”

Section: Receivermentioning

confidence: 99%

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Development and Calibration of a K-Band Ground-Based Hyperspectral Microwave Radiometer for Water Vapor Measurements

Xie¹,

Chen²,

Liu³

et al. 2013

PIER

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Abstract-In this paper, a K-band ground-based hyperspectral microwave radiometer for atmospheric sounding is proposed, which improves the profile error and vertical resolution of moisture profiling under the high water vapor condition. The hyperspectral microwave radiometer (80 K-band spectral channels) can observe the rapidly changing weather with high sensitivity and accuracy of brightness temperature by using a stable high-speed receiver and an improved tipping calibration method. By combining several advantages of traditional microwave receiver, the MMIC receiver has good ultrawideband performance, high linearity, and short measuring time. Moreover, through correcting the calibration parameters of traditional tipping calibration, the proposed calibration method can increase calibration accuracy based on the radiative transfer equation in the atmosphere. Measurement results demonstrate that the radiometer achieves a sensitivity of 0.1 K for 2 s of integration time and an accuracy of better than 0.77 K. For the water vapor profile, the variational retrievals method is used to extract the redundant information under the microwave hyperspectral condition. Preliminary comparisons of measured water vapor profiles with traditional results show good improvement of the profile error and vertical resolution.

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“…It consists of a 48-element U-shape antenna array, and each receiver channel is composed of a mmW receiver [7][8][9] and an IF IQ demodulator. The DSP subsystem computes complex correlations between IF I/Q output pairs of all receivers simultaneously, with the results calibrated to form visibility samples, whose IFT generate the brightness temperature of the field of view (FOV).…”

Section: System-level Pn Impacts On Visibility Phase Errormentioning

confidence: 99%

Local Oscillator Uncorrelated Phase Noise Analysis for Millimeter-Wave Passive Imager Bhu-2d Frequency Synthesizer

Zhang¹,

Li²,

Zheng³

et al. 2013

PIER B

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Abstract-In this paper, a nontrivial local oscillator uncorrelated phase noise analysis is proposed for frequency synthesizer of a passive millimeter-wave Synthetic Aperture Interferometric Radiometer (SAIR) imager BHU-2D designed for concealed weapon detections on human bodies with high imaging rates. The frequency synthesizer provides local oscillator signals for both millimeter-wave front-ends and intermediate frequency I/Q demodulators for the receivers. The influence of local oscillator uncorrelated phase noise in different offset frequency ranges on the visibility phase errors have been systematically investigated, and the corresponding system-level visibility specifications are drawn. The integrated RMS phase error has been applied to set uncorrelated phase noise requirements in the most critical offset frequency range for visibility error control. The synthesizer design is given, and measurement results have proved that the visibility phase error requirement is achieved by the PN analysis method proposed with system-level visibility error tests performed. To conclude, the phase noise effects on SAIR visibility phase errors are investigated by theory, and are properly limited by the PN requirement analysis method to ensure that the system-level visibility phase error specification is satisfied.

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The Round-Ended Design and Measurement of All Symmetric Edge-Coupled Bandpass Filter

Cited by 11 publications

References 13 publications

Design of H-Plane Inductance Diaphragm Waveguide Band-Pass Filter for Millimeter Imaging Frontend

Design of H-Plane Inductance Diaphragm Waveguide Band-Pass Filter for Millimeter Imaging Frontend

Development and Calibration of a K-Band Ground-Based Hyperspectral Microwave Radiometer for Water Vapor Measurements

Local Oscillator Uncorrelated Phase Noise Analysis for Millimeter-Wave Passive Imager Bhu-2d Frequency Synthesizer

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