2015 Asia-Pacific Microwave Conference (APMC)最新文献

{"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_g = λ₀/√(ε_g). (1) Here, ε_g is an equivalent dielectric constant of the leaky waveguide, and is expressed by ε_g = ε_r - (λ₀/λ_c')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 λ_c' is the cut off wavelength of the fundamental mode in the leaky waveguide. λ_c' 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_g), (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 <; √ ε_g + m λ₀ / P <; 1, (4) φ_m = cos^-1 (√(ε_g) + 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 ε_g and the period of the slots P, so either changing of ε_g 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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}