Session: WEP2A | Interactive Forum: |
Chair: | Daniela Staiculescu, Georgia Institute of Technology |
Co-Chair: | Ronglin Li, Georgia Institute of Technology |
| | WEP2A-01 | Notes on Bandpass Filters Whose Inter-Resonator Coupling Coefficients are Linear Functions of Frequency |
1074 | S. Amari1, M. Bekheit2, F. Seyfert3, 1Royal Military College, Kingston, Canada, 2Queen's University, Kingston, Canada, 3INRIA, Sophia Antipolis, France |
| The paper shows that coupled resonator filters in which the inter-resonator coupling coefficients vary linearly with the frequency can be transformed into equivalent networks in which the coupling coefficients do not depend on frequency. The frequency dependence of the coupling coefficients leads to the appearance of transmission zeros at finite frequencies that are not predicted by the shortest path rule. In particular, purely in-line topologies can produce transmission zeros at finite frequencies when the coupling coefficients depend on frequency. |
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WEP2A-02 | Miniaturized Ultra-Wideband Self-Complementary Antennas Using Shunted Spiral Inductors |
1146 | A. Saitou1, Y. Ohhashi1, K. Honjo2, K. Takahashi1, 1YKC Corporation, Musashi-Murayama, Japan, 2The University of Electro-Communications, Chofu, Japan |
| Miniaturized self-complementary wideband antennas using shunted spiral inductors are demonstrated. With Chu’s equivalent circuit, a shunt inductor is shown analytically to reduce the lower band-edge frequency. With practical shunt inductors consisting of lines and spiral inductors, line-length effect on bandwidth is clarified by simulation and measurement. With the optimized spiral inductors, miniaturized 50 Ohm impedance-matched self-complementary antennas were designed and fabricated on a low permittivity (e=4.6) and low cost FR-4 substrate. Measured return loss less than -8.7 dB between 3.9 GHz and 11.2 GHz was obtained with the antenna of which radius is 10mm. Measured radiation patterns were omni-directional between 3 GHz and 9 GHz. |
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WEP2A-03 | A Miniature Lumped Element LTCC Bandpass Filter with High Stopband Attenuation for GPS Applications |
1278 | G. M. Brzezina, L. Roy, Carleton University, Ottawa, Canada |
| We present a new fully embedded low-temperature co-fired ceramic (LTCC) bandpass filter with the highest reported stopband attenuation in its class. The filter occupies only 0.03 lambda x 0.05 lambda x 0.004 lambda of conventional low permittivity LTCC substrate. An advantage of this filter is that it is a true fourth-order design utilizing four multilayer L-C resonators. For the first time, measured results are shown for this novel topology and indicate an insertion loss of 6.7 dB and a return loss of 17.2 dB at the center frequency of 1.64 GHz. The stopband attenuation is greater than 50 dB at frequencies beyond +/- 300 MHz of the passband, making this filter suitable for GPS environments with harsh spectral interference. This is believed to be the highest performing filter, in terms of out of band attenuation, realized in LTCC. |
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WEP2A-04 | A New Ultra wideband Directional coupler Based on a Combination between CB-CPW and Microstrip Technologies |
1285 | M. Nedil, T. A. Denidni, Inrs-emt, Montreal, Canada |
| In this paper, a novel ultra wideband directional coupler employing conductor backed coplanar waveguide CB-CPW and microstrip multilayer slot coupling technique is presented and implemented. The coupler uses two different transmission lines CB-CPW and microstrip, printed on two stacked substrate layers and coupled through a rectangular slot etched on a common ground plane located between these lines. Firstly, an analysis technique was used to obtain the coupler even and odd mode characteristic impedances. Secondly, using this approach, a new design of the directional coupler was performed. Simulation and experimental results show a good performance in terms of bandwidth, which covers the entire ultra-wideband operation (3.1-10.6 GHz). |
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WEP2A-05 | Designs of Dual-Band Wilkinson Power Dividers with Flexible Frequency Ratios |
1286 | H. Zhang, H. Xin, University of Arizona, Tucson, United States |
| This paper presents new designs of Wilkinson power dividers for dual-band operations. Two types of dual-band quarter-wavelength (λ/4) transmission lines are proposed first, where both open- and short-ended stubs are applied. ABCD-matrix is then employed to derive the design equations of these dual-band lines. Based on these equations, it is found that the proposed structures feature a large frequency ratio range (from 2.16 to 4.9). By replacing the conventional λ/4-line with these dual-band lines, the desired dual-band Wilkinson power dividers can be realized. A power divider working at 1.8 / 5.8 GHz is designed using this method. Its measured performance verifies the design concepts. |
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WEP2A-06 | A novel planar dual-band branch line coupler using defect ground structure |
1289 | C. You, X. Zhu, State Key Lab of Millimeter Waves, Department of Radio Engineering, Southeast University , Nanjing, China |
| A novel planar coupler with Defect Ground Structure (DGS) is proposed for application to the dual-band operation. In the new design, two cross coupling branches are added to the conventional branch line coupler at the middle. They give more flexibility to design for dual-band application. Using the DGS, high impedance microstrip line is implemented easily and the electrical length of microstrip line increases. The two operation frequencies could be designed more closely using high impedance implemented by DGS. For verification purpose, a compact microstrip dual-band coupler applied for TD-SCDMA and WiMax operation was designed, fabricated and measured. Experimental results are in agreement with predicted values. |
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WEP2A-07 | Accurate and Efficient Design Approach of Substrate Integrated Waveguide Filter Using Numerical TRL Calibration Technique |
1301 | X. Chen, K. Wu, Ecole Polytechnique de Montreal, Montreal, Canada |
| A numerical TRL calibration technique is used to accurately extract the equivalent circuit parameters of post-wall iris and input/output coupling structure which are used for the design of directly-coupled substrate integrated waveguide (SIW) filter with the first/last SIW cavities directly excited by 50 Ω microstrip line. On the basis of this dimensional design process, the entire procedure of filter design can meet all of the design specifications without resort to any time-consuming tuning and optimization. A K-band 5th-degree SIW filter with relative bandwidth of 6% was designed and fabricated by low-cost PCB process on Rogers RT/duroid 5880. Measured results which agree well with simulated results validate the accurate dimensional synthesis procedure. |
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WEP2A-08 | A Ka-Band Multilayer LTCC 4-pole Bandpass Filter using Dual-mode Cavity resonators |
1341 | K. Ahn, I. Yom, Electronics and Telecommunications Research Institute, Daejeon, Republic of Korea |
| This paper proposes a Ka-band 4-pole bandpass filter that uses dual-mode substrate integrated cavity resonator in a multilayer low-temperature co-fired ceramic (LTCC) structure. Circular-shaped dual-mode cavity resonator comprises metallic via arrays in substrate layer, a coupling via in the cavity, and external input and output feeding slots. Size of cavity and feeding slots determine the resonant frequency and quality factor of the resonator. The position of coupling via can control the coupling amount between two degenerate modes in a single cavity structure. Two dual-mode cavities are vertically laminated for fourth-order filter. The cross-shaped slot used for coupling between the two laminated dual-mode cavity resonators can cause a coupling between non-adjacent resonators. Therefore the filter can have quasi-elliptic frequency response and high frequency selectivity. Example filter at Ka-band is designed and presented to demonstrate the validity of the new proposed structure. |
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WEP2A-09 | Small Form-factor Integrated Balun with Complex Impedance Matching |
1613 | K. Liu1, R. C. Frye2, R. Emigh1, 1STATS ChipPAC, Tempe, United States, 2RF Design Consulting, Piscataway, United States |
| Abstract — In most of wireless communication systems, especially the front end modules, there are baluns connecting active circuits (e.g., PA and LNA) . Commercially available baluns are made in some fixed impedance ratios (50:50 ohm, 50:100 ohm, etc.), which usually do not match the input or output impedance (usually in complex) of active devices. We have developed a magnetically coupled balun which has both balun and matching functions us-ing Silicon Integrated Passive Device (IPD) technology. The size of the balun is 1.2 x 1.0 x 0.4 mm^3, which is by far the smallest balun with complex impedance matching, to the best of our knowledge. Prototypes are made and measured. Good agreement has been achieved between designed and probed data. This small form-factor balun can be well used in SiP applications to reduce SMD components count and package sizes. |
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WEP2A-10 | A Planar Ultra-wideband Balanced Doubler |
1700 | Y. Kim, K. W. Kim, Y. Cho, Kyungpook National University, Daegu, Republic of Korea |
| A new low-cost design for a planar balanced doubler with ultra-wide bandwidth is presented. This doubler utilizes two types of ultra-wideband transitions: microstrip-to-CPW (coplanar waveguide) and microstrip-to-CPS (coplanar stripline) transitions. The transitions are designed to provide field and impedance matching between adjacent transmission lines. The fabricated doubler provides less than 10 dB conversion loss for output frequencies from 9 GHz to 26 GHz and less than 12 dB conversion loss from 7 GHz to 38 GHz. |
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WEP2A-11 | High Performance Bandstop Filter Design and Investigation Using Physical Model for WiMAX Measurement Equipment |
1736 | K. Ma1, R. M. Jayasuriya1, K. Chan2, 1ST Electronics (Satcom & Sensor System), Singapore, Singapore, 2MEDS-Technologies, Singapore, Singapore |
| Abstract — A novel compact planar bandstop filter with deep stopband rejection and ultra-wide passband bandwidth is introduced for worldwide interoperability microwave access (WiMAX) test equipment. The physical based equivalent circuited model is introduced and investigated. A 2.5GHz bandstop filter is designed and used for worldwide interoperability microwave access (WiMAX) test equipment. The designed fifth-order bandstop filter covers rejection band of 2.3GHz~2.85GHz with rejection more than 60dB and insertion loss less than 2dB. The center frequency of the second stopband appears as high as 5.8 times (15GHz) of that of the fundamental stopband. |
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