Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7411769
Junhong Wang, Yunjie Geng, Chong Zhang, Xingying Huo
For a leaky waveguide with periodic slots cut in the wall, the guided wavelength can be expressed as: λg = λ0/√(εg). (1) Here, εg is an equivalent dielectric constant of the leaky waveguide, and is expressed by εg = εr - (λ0/λc')2, (2) where εr is the dielectric constant of the material filled in the waveguide, and it equals 1 when no dielectric is filled; λ0 is the wavelength in free space, and λc' is the cut off wavelength of the fundamental mode in the leaky waveguide. λc' is actually different from that in closed waveguide, but the difference is not significant. The propagation constant of the leaky waveguide is then expressed by β = k0 √(εg), (3) where k0 is the wave number in free space. As we know, periodic structures can excite a lot of spatial harmonics, and some of them can leak away from the structures. The radiation condition and the beam angle of the mth harmonic are -1 <; √ εg + m λ0 / P <; 1, (4) φm = cos-1 (√(εg) + mλ0 / P), (5) where P is the period of the slots cut in the waveguide wall. From the analysis we find that the radiation beam directions of the spatial harmonics of leaky waveguide are determined by both the equivalent dielectric constant εg and the period of the slots P, so either changing of εg or changing of P will lead to changing of radiation beam angle. Based on these theory and formulas, the transmission and radiation characteristics of spatial harmonics of the leaky waveguide are studied first, and the relationships between the radiation field and structure parameters are studied as well. It can be found that for a leaky waveguide, both the harmonics with negative order (m <; 0) and positive order (m ≥ 0) can generate leaky waves. This is different from that of the leaky coaxial cable, in which only the harmonics with negative order (m <; 0) can generate leaky wave. An approach based on numerical method for analyzing the propagation constant of leaky waveguide is also given, and the relationship between the propagation constant and waveguide parameters is analyzed. The radiation property of the spatial harmonics of periodic leaky wave structures is then used in the design of antennas with beam-formed radiation patterns, for low power consumption wireless communication application. The basic principle of the design is to superpose the radiations from the -1th order spatial harmonics of a number of leaky wave structures with different slot periods in a weighting way, and the weighting factors are determined by the desired radiation pattern. Since different periodic structures generate radiation beams in different directions, and different weighting factors lead to different radiation strengths, so by properly selecting the periodic structures and weighting factors, the desired
对于壁面有周期性狭缝的漏波导，其波导波长可表示为:λg = λ0/√(εg)。(1)式中，εg为漏波导的等效介电常数，表示为εg = εr - (λ0/λc′)2，(2)式中，εr为波导中填充材料的介电常数，当不填充介质时εr = 1;λ0为自由空间波长，λc′为漏波导中基模的截止波长。λc′实际上与闭合波导中的λc′不同，但差异不显著。漏波导的传播常数表示为β = k0√(εg)，(3)，其中k0为自由空间中的波数。正如我们所知，周期结构可以激发大量的空间谐波，其中一些可以从结构中泄漏出来。第m次谐波的辐射条件和波束角为-1 g + mλ0 / P m = cos-1(√(εg) + mλ0 / P)，(5)其中P为波导壁上切割槽的周期。分析发现，泄漏波导空间谐波的射束方向由等效介电常数εg和缝隙周期P共同决定，因此，改变εg或改变P都会导致射束角的变化。基于这些理论和公式，首先研究了泄漏波导空间谐波的传输和辐射特性，以及辐射场与结构参数之间的关系。可以发现，对于漏波导，负次谐波(m <;0)和正阶(m≥0)会产生漏波。这与漏同轴电缆不同，漏同轴电缆中只有负次谐波(m <;0)会产生漏波。给出了一种基于数值方法分析泄漏波导传播常数的方法，并分析了传播常数与波导参数的关系。周期性漏波结构的空间谐波的辐射特性随后被用于设计具有波束形成辐射方向图的天线，用于低功耗无线通信应用。该设计的基本原理是将多个不同槽期漏波结构的-1阶空间谐波的辐射以加权方式叠加，加权因子由期望的辐射方向图确定。由于不同的周期结构会产生不同方向的辐射光束，不同的权重因子导致不同的辐射强度，因此通过合理选择周期结构和权重因子，可以形成所需的辐射方向图。但在实际应用中，这些具有不同槽期的漏水结构应该被映射成一个可以制造的结构。将描述不同周期缝隙结构的函数以加权方式叠加在一起，最终得到实际漏波天线的组合缝隙结构函数。辐射场叠加中的权重因子与结构函数叠加中的权重因子是两组不同的权重函数，二者应相互映射，关键是要找到辐射场与结构参数之间的关系。同时找出结构函数叠加的权重因子，得到最终的天线结构。利用该方法，设计了两种基于矩形波导和SIW结构的新型波束形辐射天线。
{"title":"Radiation characteristic of the periodic leaky wave structure and its application to leaky wave antenna design","authors":"Junhong Wang, Yunjie Geng, Chong Zhang, Xingying Huo","doi":"10.1109/APMC.2015.7411769","DOIUrl":"https://doi.org/10.1109/APMC.2015.7411769","url":null,"abstract":"For a leaky waveguide with periodic slots cut in the wall, the guided wavelength can be expressed as: λ<sub>g</sub> = λ<sub>0</sub>/√(ε<sub>g</sub>). (1) Here, ε<sub>g</sub> is an equivalent dielectric constant of the leaky waveguide, and is expressed by ε<sub>g</sub> = ε<sub>r</sub> - (λ<sub>0</sub>/λ<sub>c</sub>')<sup>2</sup>, (2) where εr is the dielectric constant of the material filled in the waveguide, and it equals 1 when no dielectric is filled; λ<sub>0</sub> is the wavelength in free space, and λ<sub>c</sub>' is the cut off wavelength of the fundamental mode in the leaky waveguide. λ<sub>c</sub>' is actually different from that in closed waveguide, but the difference is not significant. The propagation constant of the leaky waveguide is then expressed by β = k0 √(ε<sub>g</sub>), (3) where k<sub>0</sub> is the wave number in free space. As we know, periodic structures can excite a lot of spatial harmonics, and some of them can leak away from the structures. The radiation condition and the beam angle of the mth harmonic are -1 <; √ ε<sub>g</sub> + m λ<sub>0</sub> / P <; 1, (4) φ<sub>m</sub> = cos<sup>-1</sup> (√(ε<sub>g</sub>) + mλ<sub>0</sub> / P), (5) where P is the period of the slots cut in the waveguide wall. From the analysis we find that the radiation beam directions of the spatial harmonics of leaky waveguide are determined by both the equivalent dielectric constant ε<sub>g</sub> and the period of the slots P, so either changing of ε<sub>g</sub> or changing of P will lead to changing of radiation beam angle. Based on these theory and formulas, the transmission and radiation characteristics of spatial harmonics of the leaky waveguide are studied first, and the relationships between the radiation field and structure parameters are studied as well. It can be found that for a leaky waveguide, both the harmonics with negative order (m <; 0) and positive order (m ≥ 0) can generate leaky waves. This is different from that of the leaky coaxial cable, in which only the harmonics with negative order (m <; 0) can generate leaky wave. An approach based on numerical method for analyzing the propagation constant of leaky waveguide is also given, and the relationship between the propagation constant and waveguide parameters is analyzed. The radiation property of the spatial harmonics of periodic leaky wave structures is then used in the design of antennas with beam-formed radiation patterns, for low power consumption wireless communication application. The basic principle of the design is to superpose the radiations from the -1th order spatial harmonics of a number of leaky wave structures with different slot periods in a weighting way, and the weighting factors are determined by the desired radiation pattern. Since different periodic structures generate radiation beams in different directions, and different weighting factors lead to different radiation strengths, so by properly selecting the periodic structures and weighting factors, the desired","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123515008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7413172
Yu Yu, Yang Liu, Wen‐Jun Lu, Hongbo Zhu
The channel impulse response (CIR) under indoor stair environment is modeled. In this model, the amplitude and phase of the CIRs are described as Weibull and uniform distributed random variables, respectively. The CIRs can be simulated using the proposed model. Then, Orthogonal Frequency Division Multiplexing (OFDM) communication system is implemented on the measured and simulated channels. Based on the proposed model and OFDM system implementation, a preliminary channel simulator is developed. The input and output constellations, as well as the corresponding bit error rate can be visually observed using this channel simulator.
{"title":"Propagation model and channel simulator under indoor stair environment for machine-to-machine applications","authors":"Yu Yu, Yang Liu, Wen‐Jun Lu, Hongbo Zhu","doi":"10.1109/APMC.2015.7413172","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413172","url":null,"abstract":"The channel impulse response (CIR) under indoor stair environment is modeled. In this model, the amplitude and phase of the CIRs are described as Weibull and uniform distributed random variables, respectively. The CIRs can be simulated using the proposed model. Then, Orthogonal Frequency Division Multiplexing (OFDM) communication system is implemented on the measured and simulated channels. Based on the proposed model and OFDM system implementation, a preliminary channel simulator is developed. The input and output constellations, as well as the corresponding bit error rate can be visually observed using this channel simulator.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123517204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7413144
Gang Zhang, Jianpeng Wang, Sheng Ge, Wen Wu
A new balanced dual-band bandpass filter (BPF) utilizing substrate integrated waveguide (SIW) technology is proposed in this paper. By wisely arranging TE102-mode SIW cavities on the symmetrical plane, the presented balanced BPF can realize selective differential-mode (DM) transmission and quite high common-mode (CM) suppression. In addition, by adopting the extracted-pole mechanisms simultaneously, two controllable finite transmission zeros can be achieved, ensuring flexible dual passbands. The desired DM response can be easily analyzed and obtained by the equivalent 2-port circuit model. A prototype balanced BPF operating at 9.40 and 9.98 GHz has been realized to validate the proposed concept and theory. It exhibits more than 55.1 dB of maximum CM rejection within the DM passbands. Both theoretical and simulated results are provided with good agreement.
{"title":"A new balanced dual-band SIW bandpass filter with high common-mode suppression","authors":"Gang Zhang, Jianpeng Wang, Sheng Ge, Wen Wu","doi":"10.1109/APMC.2015.7413144","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413144","url":null,"abstract":"A new balanced dual-band bandpass filter (BPF) utilizing substrate integrated waveguide (SIW) technology is proposed in this paper. By wisely arranging TE102-mode SIW cavities on the symmetrical plane, the presented balanced BPF can realize selective differential-mode (DM) transmission and quite high common-mode (CM) suppression. In addition, by adopting the extracted-pole mechanisms simultaneously, two controllable finite transmission zeros can be achieved, ensuring flexible dual passbands. The desired DM response can be easily analyzed and obtained by the equivalent 2-port circuit model. A prototype balanced BPF operating at 9.40 and 9.98 GHz has been realized to validate the proposed concept and theory. It exhibits more than 55.1 dB of maximum CM rejection within the DM passbands. Both theoretical and simulated results are provided with good agreement.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121967787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7413555
Janne-Wha Wu, C. Tu, Sheng-Wen Chen, Chang-chun Chen, Hsu-Feng Hsiao, D. Chang
A low power consumption and wide locking range triple-injection-locked frequency divider by two is demonstrated. It consists of triple-injection which combines two features of direct injection and tail injection to enhance locking range. The measured locking range is from 10.18 GHz to 15.49 GHz (41.37%) with an injection power of 0dBm. The measured maximum output power is -3.42dBm with a tuning voltage of 2V. The power consumption of the core circuit takes 2.71mW from a 1.2V power supply.
{"title":"Low power consumption and wide locking range triple-injection-locked frequency divider by two","authors":"Janne-Wha Wu, C. Tu, Sheng-Wen Chen, Chang-chun Chen, Hsu-Feng Hsiao, D. Chang","doi":"10.1109/APMC.2015.7413555","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413555","url":null,"abstract":"A low power consumption and wide locking range triple-injection-locked frequency divider by two is demonstrated. It consists of triple-injection which combines two features of direct injection and tail injection to enhance locking range. The measured locking range is from 10.18 GHz to 15.49 GHz (41.37%) with an injection power of 0dBm. The measured maximum output power is -3.42dBm with a tuning voltage of 2V. The power consumption of the core circuit takes 2.71mW from a 1.2V power supply.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122017484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7411678
Dongxu Chen, W. Che, Wanchen Yang
A novel artificial ground composed by several non-periodic rectangle artificial magnetic conductor (RAMC) structures is firstly proposed, and employed as the ground plane of a probe-fed patch antenna. Based on the design strategy of parasitic patches, the dimensions and arrangements of these RAMC cells in the artificial ground as well as the size of the ground plane are investigated and discussed. As results, two RAMC-based antennas with high efficiency are proposed, which respectively can achieve very high efficiency of over 90% and stable efficiency of over 80% within the operating frequency band. For demonstration, two proposed antennas are fabricated and measured. Good agreement can be observed between the simulated and measured results.
{"title":"High-efficiency microstrip patch antennas using non-periodic artificial magnetic conductor structure","authors":"Dongxu Chen, W. Che, Wanchen Yang","doi":"10.1109/APMC.2015.7411678","DOIUrl":"https://doi.org/10.1109/APMC.2015.7411678","url":null,"abstract":"A novel artificial ground composed by several non-periodic rectangle artificial magnetic conductor (RAMC) structures is firstly proposed, and employed as the ground plane of a probe-fed patch antenna. Based on the design strategy of parasitic patches, the dimensions and arrangements of these RAMC cells in the artificial ground as well as the size of the ground plane are investigated and discussed. As results, two RAMC-based antennas with high efficiency are proposed, which respectively can achieve very high efficiency of over 90% and stable efficiency of over 80% within the operating frequency band. For demonstration, two proposed antennas are fabricated and measured. Good agreement can be observed between the simulated and measured results.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117219177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7413122
Juanjuan Gao, Guizhen Lu
In this paper, an improved zeroth-order resonator based on composite right/left-handed transmission lines is presented. Using the proposed zeroth-order resonator a novel RF microwave oscillator is designed. Because of the using of proposed zeroth-order resonator the blocking interdigital capacitor in oscillator circuit is removed, which can simplify the design process and miniaturize the circuit size. Full-wave simulations for improved zeroth-order resonator implemented with the microstrip line technology agree well with the experiments. Finally, the transient and harmonic simulations of microwave oscillator using the improved zeroth oscillator are carried out.
{"title":"Improved zeroth-order resonator used in microwave oscillator","authors":"Juanjuan Gao, Guizhen Lu","doi":"10.1109/APMC.2015.7413122","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413122","url":null,"abstract":"In this paper, an improved zeroth-order resonator based on composite right/left-handed transmission lines is presented. Using the proposed zeroth-order resonator a novel RF microwave oscillator is designed. Because of the using of proposed zeroth-order resonator the blocking interdigital capacitor in oscillator circuit is removed, which can simplify the design process and miniaturize the circuit size. Full-wave simulations for improved zeroth-order resonator implemented with the microstrip line technology agree well with the experiments. Finally, the transient and harmonic simulations of microwave oscillator using the improved zeroth oscillator are carried out.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"374 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126173891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7413214
Wei-Ling Chang, C. Meng, Chung-Yo Lin, G. Huang
This paper demonstrates a 5.8 GHz low-power, low-flicker-noise I/Q zero-IF receiver in 0.18-um CMOS process. Passive resistive mixers and deep-n-well vertical-NPN (V-NPN) bipolar junction transistors (BJTs) as the transconductance stage of the IF amplifier are employed to improve the flicker noise problem. The passive mixer is in current mode operation and thus a step-down transformer is used at the LNA output to enhance the current gain. By carefully designing the 4:2 step-down transformer, the conversion gain of the whole zero-IF receiver performs up to 51 dB when LO power is 6 dBm, and the 3-dB bandwidth covers 5.7-6.1 GHz with the current consumption of 4.7 mA at 1.8 V supply. The flicker noise corner is 100 kHz and the noise floor is 6.5 dB. The I/Q amplitude mismatch and phase difference are below 0.05 dB and 2.5°, respectively.
{"title":"5.8 GHz 4.7 mA zero-IF passive mixer receiver using a step-down transformer for gain enhancement","authors":"Wei-Ling Chang, C. Meng, Chung-Yo Lin, G. Huang","doi":"10.1109/APMC.2015.7413214","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413214","url":null,"abstract":"This paper demonstrates a 5.8 GHz low-power, low-flicker-noise I/Q zero-IF receiver in 0.18-um CMOS process. Passive resistive mixers and deep-n-well vertical-NPN (V-NPN) bipolar junction transistors (BJTs) as the transconductance stage of the IF amplifier are employed to improve the flicker noise problem. The passive mixer is in current mode operation and thus a step-down transformer is used at the LNA output to enhance the current gain. By carefully designing the 4:2 step-down transformer, the conversion gain of the whole zero-IF receiver performs up to 51 dB when LO power is 6 dBm, and the 3-dB bandwidth covers 5.7-6.1 GHz with the current consumption of 4.7 mA at 1.8 V supply. The flicker noise corner is 100 kHz and the noise floor is 6.5 dB. The I/Q amplitude mismatch and phase difference are below 0.05 dB and 2.5°, respectively.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124673532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7413347
Dandan Li, F. Xu, Jiaojiao Xu
A novel transition from coplanar waveguide (CPW) to slotline is presented in this paper, which utilizes conduct vias and metal strips to connect two ground planes of CPW instead of air bridges. The metal strips which connect the two ground planes in the back of CPW are used to suppress the reflected slotline mode in order to reduce the return loss and enlarge the bandwidth. The CPW stub used as a phase shifter converts the CPW mode to slotline mode. Due to the absence of the air bridges in the component structure, the transition can be integrated on a multilayered microwave and millimeter-wave circuits. Compared to other transitions, the proposed transition has the advantages of higher compactness, simpler fabrication, lower radiation and lower cost. The simulation results and measurement data have verified the proposed transition.
{"title":"An improved coplanar waveguide to slotline transition for multi-layer circuit structures","authors":"Dandan Li, F. Xu, Jiaojiao Xu","doi":"10.1109/APMC.2015.7413347","DOIUrl":"https://doi.org/10.1109/APMC.2015.7413347","url":null,"abstract":"A novel transition from coplanar waveguide (CPW) to slotline is presented in this paper, which utilizes conduct vias and metal strips to connect two ground planes of CPW instead of air bridges. The metal strips which connect the two ground planes in the back of CPW are used to suppress the reflected slotline mode in order to reduce the return loss and enlarge the bandwidth. The CPW stub used as a phase shifter converts the CPW mode to slotline mode. Due to the absence of the air bridges in the component structure, the transition can be integrated on a multilayered microwave and millimeter-wave circuits. Compared to other transitions, the proposed transition has the advantages of higher compactness, simpler fabrication, lower radiation and lower cost. The simulation results and measurement data have verified the proposed transition.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124683697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7411627
F. Feng, Venu-Madhav-Reddy Gongal-Reddy, Shunlu Zhang, Qi-jun Zhang
Space mapping is a recognized method for speeding up electromagnetic (EM) optimization. This paper reviews the standard and advanced space mapping approaches to EM optimization. Recent advances in space mapping approaches are discussed in this paper such as parallel space mapping and cognition-driven formulation of space mapping. Microwave component examples are used to illustrate these advanced techniques.
{"title":"Recent advances in space mapping approach to EM optimization","authors":"F. Feng, Venu-Madhav-Reddy Gongal-Reddy, Shunlu Zhang, Qi-jun Zhang","doi":"10.1109/APMC.2015.7411627","DOIUrl":"https://doi.org/10.1109/APMC.2015.7411627","url":null,"abstract":"Space mapping is a recognized method for speeding up electromagnetic (EM) optimization. This paper reviews the standard and advanced space mapping approaches to EM optimization. Recent advances in space mapping approaches are discussed in this paper such as parallel space mapping and cognition-driven formulation of space mapping. Microwave component examples are used to illustrate these advanced techniques.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125066495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/APMC.2015.7411657
P. Choubey, W. Hong
This paper presents a novel technique to design a dual-band bandpass filter by exploiting the second order degenerated modes of the SIW-cavity. The second order filter has been designed by using the proposed technique, at Ka-band of microwave frequencies; the ratio of two bands center frequencies - frequency ratio (FR) - is 1.073. Rogers RT/Duroid 5880 - with substrate height of 0.508mm - has been used as the substrate material for design purpose. The measured return loss of the filter in both bands is better than -15 dB, moreover, the isolation between two bands is also better than 40 dB.
{"title":"Dual-band bandpass filter designed by exploiting the second-order degenerated modes of the SIW-cavity","authors":"P. Choubey, W. Hong","doi":"10.1109/APMC.2015.7411657","DOIUrl":"https://doi.org/10.1109/APMC.2015.7411657","url":null,"abstract":"This paper presents a novel technique to design a dual-band bandpass filter by exploiting the second order degenerated modes of the SIW-cavity. The second order filter has been designed by using the proposed technique, at Ka-band of microwave frequencies; the ratio of two bands center frequencies - frequency ratio (FR) - is 1.073. Rogers RT/Duroid 5880 - with substrate height of 0.508mm - has been used as the substrate material for design purpose. The measured return loss of the filter in both bands is better than -15 dB, moreover, the isolation between two bands is also better than 40 dB.","PeriodicalId":269888,"journal":{"name":"2015 Asia-Pacific Microwave Conference (APMC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129911222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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