Electronically Tunable Microwave Bandpass Filters

Hunter, Jane; Rhodes,

doi:10.1109/tmtt.1982.1131260

Cited by 270 publications

(124 citation statements)

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“…Varactor diode has been one of the most promising technologies that have been widely used in the realization of a wide variety of electronically tunable filters. In the early work of varactor tuned filter developments, the center frequency was tuned by loading the varactor diodes at the ends of resonating stubs [4]. It was noticed that, the bandstop characteristic of the filter was largely dependent upon the coupling gap between the feeding transmission line and the parallel stubs.…”

Section: Varactor Diodesmentioning

confidence: 99%

“…It was noticed that, the bandstop characteristic of the filter was largely dependent upon the coupling gap between the feeding transmission line and the parallel stubs. Since the coupling gaps of the parallel stubs are highly frequency dependent, it was suggested in [4], to tune the capacitance of the gaps in accordance with the tuning capacitances in order to preserve the bandstop characteristics. In [5], a varactor tuned ring resonator filter using microstrip technology was presented.…”

Section: Varactor Diodesmentioning

confidence: 99%

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Developing One-Dimensional Electronically Tunable Microwave and Millimeter-Wave Components and Devices Towards Two-Dimensional Electromagnetically Reconfigurable Platform

Adhikari

Wu²

2013

PIER

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Abstract-An overview of state-of-the-art frequency tunable technologies in the realization of tunable radio frequency (RF) and microwave tunable circuits is presented with focus on filter designs. Those enabling techniques and materials include semiconductors, microelectro-mechanical systems (MEMS), ferroelectric and ferromagnetic materials. Various performance indicators of one-dimensional tunable filters are addressed in terms of tunability, losses, signal integrity and other aspects. Fundamental limitations of the classical one-dimensional tuning method are discussed, which makes use of only one type of tunable elements such as either electric or magnetic tuning/controlling of circuit parameters. Requirements of simultaneous electric and magnetic two-dimensional tuning techniques are highlighted for achieving an unprecedented and advantageous wider modal tuning. It is believed that this emerging scheme will lead its way in the realization of future highly efficient and tunable RF and microwave components and devices.

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Section: Varactor Diodesmentioning

confidence: 99%

Section: Varactor Diodesmentioning

confidence: 99%

Developing One-Dimensional Electronically Tunable Microwave and Millimeter-Wave Components and Devices Towards Two-Dimensional Electromagnetically Reconfigurable Platform

Adhikari

Wu²

2013

PIER

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“…In the general field of tunable filters, several approaches have been introduced previously, such as solid-state varactors, variable capacitors/inductors by means of microelectro-mechanical systems (MEMS) techniques (Hunter and Rhodes 1982). Typical drawbacks of CMOS varactors include high losses, unacceptable signal-to-noise (SNR) ratio, and rendered linearity.…”

Section: Introductionmentioning

confidence: 99%

Micromachined W-band polymeric tunable iris filter

Sammoura

Lin

2011

Microsyst Technol

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A tunable filter working in the W-band spectrum has been successfully demonstrated using a combined plastic molding and electroplating process. The prototype filter architecture has two deformable membranes of 1.6 mm in diameter on top of a WR-10 waveguide based, two-cavity, polymeric iris filter. The membranes can be actively adjusted to deform and alter the cavity geometry concurrently for frequency tuning applications. The tunable filter was simulated using High Frequency Structure Simulator and theoretically analyzed using the perturbation method. Experimentally, a prototype band-pass filter has bandwidth of 4.05 GHz centered at 94.79 GHz and a minimum insertion loss of 2.37 dB with return loss better than 15 dB. As a tunable filter, a total of 2.59 GHz center frequency change has been recorded when the membranes deflected from 50 lm into, to 150 lm out of the waveguide. These results imply that the demonstrated tunable filter could be potentially applicable for waveguide-based mm-wave systems.

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“…Most of them can be classified in three categories; YIG filters [1], varactor diode filters [2]- [4], and RF-MEMS filters [5]- [8]. The YIG filters have mutioctave tuning ranges and a Q up to 10,000, however, their power consumption, tuning speed, size, and weight limit their use in highly integrated communication systems.…”

Section: Introductionmentioning

confidence: 99%

Low-Loss 4-6 GHz Tunable Filter with 3-Bit High-Q Orthogonal RF-MEMS Capacitance Network

Sarabandi¹,

Park²,

El-Tanani³

et al. 2008

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Standard Form 298 (Rev. 8/98) REPORT DOCUMENTATION PAGEPrescribed by ANSI Std. Z39.18 Form Approved OMB No. 0704-0188The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to the Department of Defense, Executive Services and Communications Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. Abstract-A low loss 4-6 GHz 3-bit tunable filter was designed and fabricated on a quartz substrate. A high-Q 3-bit orthogonal RF-MEMS capacitance network is presented and its significance on the filter Q is discussed. Detailed design equations for the capacitively-loaded coupled open-loop λ/2 resonators and realization of capacitive external coupling with source-load impedance loading are discussed. The measured filter shows an unloaded-Q of 85-170, an insertion loss of 1.5-2.8 dB (including connector loss), and the measured 1-dB bandwidth is 4.35 ± 0.35% over the 4-6 GHz tuning range. The measured IIP3 and 1-dB power compression point at 5.91 GHz are > 40 dBm and 27.5 dBm, respectively. The unloaded Q and insertion loss can be improved to 125-210 and 1.8-1.1 dB with the use of a thicker bottom electrode. To our knowledge, this is the highest Q tunable planar filter to-date at this frequency range. PLEASE DO NOT RETURN YOUR PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S)12

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Electronically Tunable Microwave Bandpass Filters

Cited by 270 publications

References 0 publications

Developing One-Dimensional Electronically Tunable Microwave and Millimeter-Wave Components and Devices Towards Two-Dimensional Electromagnetically Reconfigurable Platform

Developing One-Dimensional Electronically Tunable Microwave and Millimeter-Wave Components and Devices Towards Two-Dimensional Electromagnetically Reconfigurable Platform

Micromachined W-band polymeric tunable iris filter

Low-Loss 4-6 GHz Tunable Filter with 3-Bit High-Q Orthogonal RF-MEMS Capacitance Network

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