Session: TH4D | Tunable and Active Filters |
Chair: | Youji Kotsuka , Metamaterial Research Institute Tokai University |
Co-Chair: | Pierre Blondy, XLIM - CNRS - Université de Limoges |
Abstract: | Advances in tunable and active filters are being driven by the demands for software defined systems. This session presents a fascinating view of these activities with the papers on wide variety of topics. These includes ultra wide band frequency tuning, switchable / reconfigurable, millimeter wave, active, and super-regenerative ultra-wideband filters. |
| | TH4D-01 | Multi-Scale Tunable Filter Covering a Frequency Range of 6.5:1 |
1761 | M. Koochakzadeh1, A. Abbaspour-Tamijani2, 1Arizona State University, Tempe, United States, 2Arizona State University, Tempe, United States |
| A multi-scale filter topology is proposed in the form of a switched comb-line structure loaded by varactors. This topology is capable of implementing a tunable frequency response with consistent performance over very large tuning ranges. Two prototype filters of orders two and four have been fabricated in a coplanar geometry. The filters are tunable in a 6.5:1 frequency range. |
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TH4D-02 | Manifold-Coupled Switched Filter Bank Implementing Filters with Embedded Switches |
1715 | P. D. Laforge1, R. R. Mansour1, M. Yu2, 1University of Waterloo, Waterloo, Canada, 2Com Dev, Cambridge, Canada |
| A switched filter bank with 2^N states for an N channel system is designed, fabricated, and tested. The design implements input and output manifold-coupled multiplexers with tunable filters. The bandwidth associated with a channel filter can be added or removed by actuating switches placed within the filter itself. This type of tuning allows for the switching of channel filters without affecting the other filters connected to the manifold. The concept is demonstrated using coplanar waveguide filters and diplexers. |
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TH4D-03 | Miniaturized Reconfigurable Filter Using PIN diode For UWB Applications |
1640 | M. Karim, G. Yong Xin, C. Zhi Ning, M. Ong, Institute for Infocomm Research, Singapore, Singapore |
| This paper reports a new compact design of UWB reconfigurable filter which switches from bandstop to bandpass filter using pin-diode. First, a unit cell is developed which consist of two bended open stubs of quarter-wavelength and a connecting stub of half-wavelength. Two unit cells are cascaded by inductive stub to form a bandstop filter. Avago’s RF pin diode is used to switch the filter from bandstop to bandpass filter at the same resonant frequency. The equivalent circuit model and its parameters are extracted. The measurement results for bandstop filter shows a rejection bandwidth is 5.2 GHz and the insertion loss in the passband is 0.6 dB. For the bandpass filter, the insertion loss is 2.1 dB and 3-dB bandwidth is from 3.6 GHz to 10.5 GHz. The area of novel unit cell filter is (g/4)2 at the centre frequency of the bandstop, while the area of the filter realized using the non bending stubs and connecting lines is 2(g/4)2 for the same bandstop characteristics |
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TH4D-04 | Tunable RF Bandpass Filter with Variable Resonator Couppling |
1592 | J. C. Estes, Rockwell Collins, Scottsdale, United States |
| A new tunable filter technique is presented in which the coupling between adjacent resonators of the filter dcrease as the tuning frequency is increased thereby maintaining almost constant bandwidth across the tuning range. Varactor diodes can be used for continuous tuning or switched capacitors can be used for discrete tuning. Electromagnetic (EM) simulations using low temperature co-fired ceramic technology (LTCC) type resonators have shown that a 50 percent tuning range is achievable with bandwidth variations of +/- 5 percent using this technique. A three pole Chebyshev filter with varactor tuning was bread boarded exhibiting a 23 percent tuning range from 453 to 561 MHz, a 3 dB bandwidth of 109 to 119 MHz and a passband insertion loss of less than 0.7 dB. |
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TH4D-05 | Novel Tunable Hexaferrite Bandpass Filter Based on Rectangular Waveguide Coupled Shielded Coplanar Transmission Lines |
1254 | M. Sterns, D. Schneiderbanger, R. Rehner, S. Martius, L. Schmidt, University of Erlangen-Nuremberg, Erlangen, Germany |
| In this paper a novel tunable high isolation bandpass filter is presented. The filter consists of two shielded coplanar transmission lines coupled by a rectangular waveguide. Hexagonal ferrite spheres are used to cover a tuning frequency range from 50 to 80GHz. Measurement results up to 69GHz are shown. The measured insertion loss of the filter lies between 7.1 and 9.3dB. An off-resonance isolation better than 60dB is achieved what is extraordinarily high for a two spheres filter. The typical 3dB-bandwidth is about 250MHz. As planar transmission lines are used, the filter can be integrated into a coplanar or microstrip environment easily what is advantageous for the construction of highly integrated modules. The operating frequency range can be expanded up to 80GHz by replacing the 1.85mm-connectors by 1mm-connectors or using other suitable waveguide transitions, thus covering considerably more bandwidth than rectangular waveguide based coupling structures. |
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TH4D-06 | A 3.7-mW Zero-dB Fully Integrated Active Bandpass Filter at Ka-band in 0.18-μm CMOS |
1495 | M. Chiang, H. Wu, C. C. Tzuang, Graduate Institute of Communication Engineering, Taipei, Taiwan |
| A 3.7-mW 0-dB fully integrated two-order active bandpass filter at Ka-band using the standard 0.18-um 1P6M CMOS technology is presented for the first time. The filter is used the active resonator, which is composed of the synthetic quasi-TEM transmission line (TL) and a differential nMOS cross-coupled pair that provides Q-enhancement. The on-wafer measurements show the prototype has a bandwidth of 18.8%, with a -4.6 dBm 1-dB compression point (P1dB) at 34.2 GHz, consuming the power of 3.7 mW. The on-chip noise figure (NF) is 7.0 dB in the passband. The effective size of the prototype is 275.0 um × 420.0 um (without contact pads), showing the potential on system integration for monolithic microwave integrated circuit (MMIC) applications. |
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TH4D-07 | Low Power Complementary-Colpitts Self-Quenched Super-regenerative Ultra-Wideband (UWB) Bandpass Filter in CMOS Technology |
1499 | M. Anis, R. Tielert, N. Wehn, University of Technology, Kaiserslautern, Kaiserslautern, Germany |
| This paper presents the complementary colpitts self-quenched super-regenerative ultra-wideband (UWB) bandpass filter for low power, low cost and medium data rate wireless communication systems. The high gain, large bandwidth and low power consumption are the attractive properties of self-quenched super-regenerative filters for UWB systems. The bandwidth of 1.5GHz across the central frequency of 7.5GHz is measured for complementary colpitts self-quenched super-regenerative filter. The test structure has been implemented on 0.18µm CMOS technology. The data rate of 10Mb/s is achieved for detecting -95dBm signals with power consumption of 1mW at 1.5V |
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