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Miniaturized Intermediate-Frequency Filter for BeiDou Navigation Satellite System
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-13 DOI: 10.1002/mop.70106
Qian Kewei, Tian Miao

A new type of intermediate-frequency (IF) filter based on LTCC multilayer technology for BeiDou navigation satellite system is presented in this letter. By reasonably selecting the equivalent circuit value of each passive component, and separating the effective area of each inductance and capacitance to reduce the influence of parasitic coupling, an IF bandpass filter with a center frequency of only 46 MHz can be realized in a ceramic surface mount package. Besides, the locations of the transmission zeros can be tuned individually by changing the LC value of each resonant cell, thus a deep suppression level and wide stopband could be obtained simultaneously. The IF filter has a compact size of 10 mm × 6 mm × 2 mm, which is very suitable for the portable BeiDou B3 system.

本文介绍了一种基于 LTCC 多层技术的新型中频(IF)滤波器,用于北斗卫星导航系统。通过合理选择各无源器件的等效电路值,并分离各电感和电容的有效面积以减少寄生耦合的影响,可以在陶瓷表面贴装封装中实现中心频率仅为 46 MHz 的中频带通滤波器。此外,还可以通过改变每个谐振单元的 LC 值来单独调整传输零点的位置,从而同时获得较深的抑制电平和较宽的阻带。中频滤波器的尺寸为 10 毫米 × 6 毫米 × 2 毫米,非常适合便携式北斗 B3 系统。
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引用次数: 0
A New Dual-Band Filtering Power Divider Based on a Single Multimode Modified Triangle Patch Resonator
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-13 DOI: 10.1002/mop.70099
Yijun Li, Jinxuan Ni, Qiyue Gao, Xin Zhou, Zhengkang Liu, Na Li, Gang Zhang

This letter proposes a new design of a dual-band (DB) filtering power divider (FPD) on a single multimode-modified triangle patch resonator. The proposed design leverages the resonant characteristics of an equilateral triangle patch resonator to exploit the TM10, TM11, TM21, and TM30 resonant modes within a single multimode-modified triangle patch resonator, enabling the realization of an FPD with DB operation. To achieve two assumed second-order filtering passbands, a metal via and multiple perturbed slots are introduced, providing flexible control over the resonant mode frequencies. The first passband is formed by the TM10 and TM11 modes, while the second passband is formed by the TM21 and TM30 modes. To ensure in-band isolation for both passbands, two sets of isolation networks are developed. A prototype is designed, fabricated, and measured to validate the proposed method. The measured results demonstrate excellent agreement with the simulated ones.

这封信提出了在单个多模修正三角形贴片谐振器上设计双频(DB)滤波功率分配器(FPD)的新方案。该设计利用等边三角形贴片谐振器的谐振特性,在单个多模修正三角形贴片谐振器内利用 TM10、TM11、TM21 和 TM30 谐振模式,实现了具有 DB 工作模式的 FPD。为实现两个假定的二阶滤波通带,引入了一个金属通孔和多个扰动槽,对谐振模式频率进行灵活控制。第一个通带由 TM10 和 TM11 模式形成,第二个通带由 TM21 和 TM30 模式形成。为确保两个通带的带内隔离,开发了两套隔离网络。为了验证所提出的方法,我们设计、制造并测量了一个原型。测量结果与模拟结果非常吻合。
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引用次数: 0
Generation of Dark Pulses in Mode-Locked Erbium-Doped Fiber Ring Laser Operating in L-Band Region Using Sc2O3 Absorber
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-10 DOI: 10.1002/mop.70103
Mahmoud M. Ahmeed, B. A. Ahmad, Latifah Sarah Supian, Abdulkadir Mukhtar Diblawe, Sulaiman Wadi Harun

By incorporating scandium oxide (Sc2O3) powder into a PVA film, a Sc2O3 saturable absorber (SA) was successfully developed, boasting a modulation depth of 25%. When integrated into a ring erbium-doped fiber laser, the Sc2O3-SA facilitated the production of mode-locked dark pulses featuring multi-wavelength emission, leveraging its saturable absorbing ability along with the nonlinear properties inherent in the Sc2O3 thin film and the long erbium-doped fiber. Mode-locking operation was achieved within a pumping range of 209.3–239.8 mW, resulting in a peak pulse energy of 0.71 nJ. Operating at 1597.8 nm, the mode-locked laser demonstrated a repetition rate of 10.42 MHz and a pulse width of 23 ns. Domain-wall dark pulse operation was demonstrated in the L-band region, achieving a relative stability with a signal-to-noise ratio of 55.6 dB, utilizing a Sc2O3 thin film absorber and an 8-meter-long active fiber. These findings underscore the promising potential of Sc2O3 to be used in pulsed laser systems, particularly due to its exceptional nonlinear optical properties.

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引用次数: 0
Characterization and Compensation of Nonideal Effects of Modulation Functions in Time-Modulated Array for Direction-of-Arrival Extraction
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-10 DOI: 10.1002/mop.70079
Geon U Kim, Jeong Phill Kim

This article investigates nonidealities of the time modulation function that may affect the measurement accuracy when extracting the direction of arrival (DOA) using the time-modulated array. The types of nonidealities are identified and the fundamental and harmonic Fourier coefficients for each type are calculated theoretically. The measurement DOA error is calculated using these Fourier coefficients, and the allowable bounds of the nonideal parameters guaranteeing the confidence region of the error are proposed. Furthermore, a two-step measurement procedure is proposed to reduce these errors. For a systematic reduction of the measurement errors, a method for characterizing and compensating the nonidealities is investigated. To verify the validity of the proposed theory and measurement method, experiments are conducted to compare the results with and without calibration and compensation.

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引用次数: 0
Design of Tri-Band Doherty Power Amplifier Using Phase and Impedance Constrained Optimization
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-10 DOI: 10.1002/mop.70100
Wa Kong, Yunqin Chen, Jing Xia, Zhongpeng Ni, Shaohua Ni, Wence Zhang, Xiao-Wei Zhu

To realize the wideband and efficient operation of Doherty power amplifier (DPA) in multi-band mode, this paper proposes a tri-band DPA design method based on phase and impedance-constrained optimization. First, the phases required for impedance transformation networks across multi-band are determined based on the impedance required when the DPA operates at back-off power (BOP) and saturation. Then, the impedance judgment method using multiple impedance constraint circles was employed to determine the optimal load impedances. Finally, the phase and impedance constraints at multiple frequencies were used to optimize the carrier and peaking output matching networks. For verification, a tri-band DPA operating at 1.25−1.35, 1.9−2.1, and 2.75−2.85 GHz was designed and fabricated. Measured results show that, for the above three frequency bands, the drain efficiencies (DEs) at saturation reach 59.0%−61.7%, 59.5%−64.2%, and 52.4%−59.8% with corresponding output power exceeding 43 dBm. For 6 dB BOP, the DEs are 46.1%−54.2%, 50.4%−55.2%, and 44.8%−51.9%. Moreover, good linearity can be achieved after linearization for 20 MHz modulated signals.

{"title":"Design of Tri-Band Doherty Power Amplifier Using Phase and Impedance Constrained Optimization","authors":"Wa Kong,&nbsp;Yunqin Chen,&nbsp;Jing Xia,&nbsp;Zhongpeng Ni,&nbsp;Shaohua Ni,&nbsp;Wence Zhang,&nbsp;Xiao-Wei Zhu","doi":"10.1002/mop.70100","DOIUrl":"https://doi.org/10.1002/mop.70100","url":null,"abstract":"<div>\u0000 \u0000 <p>To realize the wideband and efficient operation of Doherty power amplifier (DPA) in multi-band mode, this paper proposes a tri-band DPA design method based on phase and impedance-constrained optimization. First, the phases required for impedance transformation networks across multi-band are determined based on the impedance required when the DPA operates at back-off power (BOP) and saturation. Then, the impedance judgment method using multiple impedance constraint circles was employed to determine the optimal load impedances. Finally, the phase and impedance constraints at multiple frequencies were used to optimize the carrier and peaking output matching networks. For verification, a tri-band DPA operating at 1.25−1.35, 1.9−2.1, and 2.75−2.85 GHz was designed and fabricated. Measured results show that, for the above three frequency bands, the drain efficiencies (DEs) at saturation reach 59.0%−61.7%, 59.5%−64.2%, and 52.4%−59.8% with corresponding output power exceeding 43 dBm. For 6 dB BOP, the DEs are 46.1%−54.2%, 50.4%−55.2%, and 44.8%−51.9%. Moreover, good linearity can be achieved after linearization for 20 MHz modulated signals.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Trace C2H2 Detection Based on Near-Infrared Dual-Comb Spectroscopy
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-10 DOI: 10.1002/mop.70073
Shuangquan Rong, Xiaocong Sun, Yuqi Yang, Yueting Zhou, Ting Gong, Mengpeng Hu, Qiang Wang, Xuanbing Qiu, Chuanliang Li

To achieve low-concentration measurement using near-infrared dual-comb spectroscopy (DCS), this study presents a trace C2H2 detection using near-infrared DCS. A multi-pass gas cell is employed to extend the optical path length, improving the sensor's sensitivity. Signal post-processing via interpolation method is applied to reduce noise and achieve a flatter dual-comb. The sensor's sensitivity and transient characteristics are evaluated by selecting absorption lines at 6526.53, 6529.17, and 6531.78 cm−1, with the experimental profile being well-fitted by a Voigt function. The stability of the system is confirmed with a C2H2 concentration of 200 ppm over a 2.5 h observation period, showing a stability better than 2.305 × 10−2. Allan variance analysis indicates an optimal integration time of 597 s, yielding a minimum detection limit of 6.15 × 10−4 for absorbance and 350 ppb for concentration. Additionally, the detection of nine absorption lines demonstrates the multi-peak measurement capability, with deviations ranging from 0.059% to 12.496%.

{"title":"A Trace C2H2 Detection Based on Near-Infrared Dual-Comb Spectroscopy","authors":"Shuangquan Rong,&nbsp;Xiaocong Sun,&nbsp;Yuqi Yang,&nbsp;Yueting Zhou,&nbsp;Ting Gong,&nbsp;Mengpeng Hu,&nbsp;Qiang Wang,&nbsp;Xuanbing Qiu,&nbsp;Chuanliang Li","doi":"10.1002/mop.70073","DOIUrl":"https://doi.org/10.1002/mop.70073","url":null,"abstract":"<div>\u0000 \u0000 <p>To achieve low-concentration measurement using near-infrared dual-comb spectroscopy (DCS), this study presents a trace C<sub>2</sub>H<sub>2</sub> detection using near-infrared DCS. A multi-pass gas cell is employed to extend the optical path length, improving the sensor's sensitivity. Signal post-processing via interpolation method is applied to reduce noise and achieve a flatter dual-comb. The sensor's sensitivity and transient characteristics are evaluated by selecting absorption lines at 6526.53, 6529.17, and 6531.78 cm<sup>−1</sup>, with the experimental profile being well-fitted by a Voigt function. The stability of the system is confirmed with a C<sub>2</sub>H<sub>2</sub> concentration of 200 ppm over a 2.5 h observation period, showing a stability better than 2.305 × 10<sup>−2</sup>. Allan variance analysis indicates an optimal integration time of 597 s, yielding a minimum detection limit of 6.15 × 10<sup>−4</sup> for absorbance and 350 ppb for concentration. Additionally, the detection of nine absorption lines demonstrates the multi-peak measurement capability, with deviations ranging from 0.059% to 12.496%.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Strain-Engineered Germanium Microbridge LED With Silicon Nitride Stressor
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-10 DOI: 10.1002/mop.70086
Bin Shu, Bingzhang Zhu, Xinyang Sun, Zhichao Yu, Huiyong Hu, Liming Wang, Tian Miao, Ningning Zhang

Germanium (Ge) has garnered significant attention in the field of silicon-based monolithic light sources as an attractive material. Silicon nitride is widely used in optoelectronic devices due to its excellent optical properties. By using silicon nitride as a stressor to introduce tensile strain into Ge, the band structure of Ge can be tuned, enhancing the radiative recombination of direct bandgap emission. A LED with silicon nitride as a stressor is proposed in this paper. Simulation results demonstrate that the device has been introduced to a 3% uniaxial tensile strain, resulting in peak electroluminescence at 1986 nm and a maximum electro-optical conversion efficiency of 1.94%, indicating excellent performance in the short infrared wavelength range. This work provides a method for achieving more efficient silicon-based group IV light sources.

{"title":"Strain-Engineered Germanium Microbridge LED With Silicon Nitride Stressor","authors":"Bin Shu,&nbsp;Bingzhang Zhu,&nbsp;Xinyang Sun,&nbsp;Zhichao Yu,&nbsp;Huiyong Hu,&nbsp;Liming Wang,&nbsp;Tian Miao,&nbsp;Ningning Zhang","doi":"10.1002/mop.70086","DOIUrl":"https://doi.org/10.1002/mop.70086","url":null,"abstract":"<div>\u0000 \u0000 <p>Germanium (Ge) has garnered significant attention in the field of silicon-based monolithic light sources as an attractive material. Silicon nitride is widely used in optoelectronic devices due to its excellent optical properties. By using silicon nitride as a stressor to introduce tensile strain into Ge, the band structure of Ge can be tuned, enhancing the radiative recombination of direct bandgap emission. A LED with silicon nitride as a stressor is proposed in this paper. Simulation results demonstrate that the device has been introduced to a 3% uniaxial tensile strain, resulting in peak electroluminescence at 1986 nm and a maximum electro-optical conversion efficiency of 1.94%, indicating excellent performance in the short infrared wavelength range. This work provides a method for achieving more efficient silicon-based group IV light sources.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Monitoring of the Curing Process for Lining Materials Based on Terahertz Time-Domain Reflective Spectroscopy
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-09 DOI: 10.1002/mop.70104
Siyi Han, Wenhui Yan, Yiran Ju, Qiang Zhang, Yuping Liu, Zhiyong Wei, Jing Xu, Yuejin Zhao, Cunlin Zhang, Zhenwei Zhang

As a bonding material for bonding the shell and propellant in the combustion chamber of solid rocket motor, the liner plays a protective role for the engine. Only when the liner is in a “semi-solidified state” can the charge quality be guaranteed, and it is easy to cause the phenomenon of unstable bonding interface if the charge is loaded too early or too late. Therefore, noncontact monitoring of the gradual solidification process of the material from liquid state can prevent the problems of unstable bonding interface and significantly improve the safety of solid rocket motors. In this paper, the reflective terahertz time-domain spectroscopy technology is used to monitor the curing process of lining materials, extract the refractive index spectra of samples with different curing degrees, establish the relationship between refractive index and curing reaction time, and compare it with the material loss factor obtained by rheometer to establish the correlation between refractive index and material loss factor. The experimental results show that the refractive index decreases gradually during the curing process, and the correlation coefficient between the refractive index and material loss factor is higher than 0.9. With the curing reaction, the refractive index can accurately reflect the curing process of polyurethane materials. This study provides an effective means for monitoring the curing process of lining materials.

{"title":"Monitoring of the Curing Process for Lining Materials Based on Terahertz Time-Domain Reflective Spectroscopy","authors":"Siyi Han,&nbsp;Wenhui Yan,&nbsp;Yiran Ju,&nbsp;Qiang Zhang,&nbsp;Yuping Liu,&nbsp;Zhiyong Wei,&nbsp;Jing Xu,&nbsp;Yuejin Zhao,&nbsp;Cunlin Zhang,&nbsp;Zhenwei Zhang","doi":"10.1002/mop.70104","DOIUrl":"https://doi.org/10.1002/mop.70104","url":null,"abstract":"<div>\u0000 \u0000 <p>As a bonding material for bonding the shell and propellant in the combustion chamber of solid rocket motor, the liner plays a protective role for the engine. Only when the liner is in a “semi-solidified state” can the charge quality be guaranteed, and it is easy to cause the phenomenon of unstable bonding interface if the charge is loaded too early or too late. Therefore, noncontact monitoring of the gradual solidification process of the material from liquid state can prevent the problems of unstable bonding interface and significantly improve the safety of solid rocket motors. In this paper, the reflective terahertz time-domain spectroscopy technology is used to monitor the curing process of lining materials, extract the refractive index spectra of samples with different curing degrees, establish the relationship between refractive index and curing reaction time, and compare it with the material loss factor obtained by rheometer to establish the correlation between refractive index and material loss factor. The experimental results show that the refractive index decreases gradually during the curing process, and the correlation coefficient between the refractive index and material loss factor is higher than 0.9. With the curing reaction, the refractive index can accurately reflect the curing process of polyurethane materials. This study provides an effective means for monitoring the curing process of lining materials.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Millimeter-Wave Ultra-Wideband Compact Wilkinson Power Divider Based on Auxiliary Resonance Network
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-09 DOI: 10.1002/mop.70101
Qijun Lu, Dawei Han, Hao Zhang, Tao Zhang, Zhangming Zhu

This letter presents a millimeter-wave ultra-wideband compact Wilkinson power divider (WPD) with an impedance compensation technique. For the first time, parallel LC resonance networks are introduced to compensate for the rapidly decreasing real part of the input impedance, resulting in additional matching and lossless frequency points. Besides, this design also leads to a reduction in area by more than 25% compared to traditional lumped-element WPDs. The proposed novel WPD is implemented using 65 nm CMOS technology with a compact core area of 0.022 mm2 (0.88 × 10−3 λ02) and achieves the measured insertion loss of 1.36‒1.56 dB from 62 to 104 GHz, reaching the 0.2 dB-amplitude fraction bandwidth of 70% (42 GHz). Furthermore, the corresponding input-output return loss and isolation are better than 10 and 17 dB, respectively.

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引用次数: 0
Electrically Tunable Substrate Integrated Waveguide Equalizer With Stable Insertion Loss in High Frequency
IF 1 4区 工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-01-09 DOI: 10.1002/mop.70084
Lifeng Chen, Fei Xing, Hao Peng, Na Xue, Ziyan Qi, Yu Liu, Serioja Ovidiu Tatu, Tao Yang

In this letter, a novel design for an electrically tunable substrate integrated waveguide (SIW) equalizer that maintains a stable insertion loss at high frequencies, is proposed. The SIW equalizer is composed of various parallel units consisting of microwave resistor (R) and varactor diode (C). Different resistance and capacitance values, forming a complex impedance, are achieved through PIN and varactor diodes under different DC biases, respectively. It results in greater losses in the low-frequency range compared to the high-frequency range, achieving an equalization effect. Moreover, because ideal capacitors do not contribute to signal loss, the loss in the high-frequency range remains minimal and stable under certain conditions. Experimental results indicate that the equalization range in the Ku-band is 0.30–9.75 dB with a DC voltage range of 0–4 V, and the insertion loss change in the high-frequency band is only 0.5 dB. For the equalizer operating in the Ka-band, within a DC voltage range of 6–14 V, the equalization range is 0.30–16.60 dB, with a change in insertion loss of only 0.12 dB at high frequencies. The return losses of equalizers are all better than −12.4 dB and −11.6 dB, respectively, in Ku- and Ka-band.

{"title":"Electrically Tunable Substrate Integrated Waveguide Equalizer With Stable Insertion Loss in High Frequency","authors":"Lifeng Chen,&nbsp;Fei Xing,&nbsp;Hao Peng,&nbsp;Na Xue,&nbsp;Ziyan Qi,&nbsp;Yu Liu,&nbsp;Serioja Ovidiu Tatu,&nbsp;Tao Yang","doi":"10.1002/mop.70084","DOIUrl":"https://doi.org/10.1002/mop.70084","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, a novel design for an electrically tunable substrate integrated waveguide (SIW) equalizer that maintains a stable insertion loss at high frequencies, is proposed. The SIW equalizer is composed of various parallel units consisting of microwave resistor (<i>R</i>) and varactor diode (<i>C</i>). Different resistance and capacitance values, forming a complex impedance, are achieved through PIN and varactor diodes under different DC biases, respectively. It results in greater losses in the low-frequency range compared to the high-frequency range, achieving an equalization effect. Moreover, because ideal capacitors do not contribute to signal loss, the loss in the high-frequency range remains minimal and stable under certain conditions. Experimental results indicate that the equalization range in the <i>Ku</i>-band is 0.30–9.75 dB with a DC voltage range of 0–4 V, and the insertion loss change in the high-frequency band is only 0.5 dB. For the equalizer operating in the Ka-band, within a DC voltage range of 6–14 V, the equalization range is 0.30–16.60 dB, with a change in insertion loss of only 0.12 dB at high frequencies. The return losses of equalizers are all better than −12.4 dB and −11.6 dB, respectively, in <i>Ku</i>- and <i>Ka</i>-band.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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Microwave and Optical Technology Letters
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