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Topic: Bandpass filters

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	bandpass filters at Filtronetics, Inc.
		A bandpass filter transfers energy from the source to its load in a select band of frequencies between the lower cutoff frequency and the upper cutoff frequency.
		The LC or lumped element bandpass filter is comprised of inductors and capacitors.
		Narrowband crystal filters with low insertion loss are achievable for bandwidths from 0.005% to 2% of the center frequency.
	www.filtro.net /content/bandpass_filters.html (735 words)

	Bandpass Filter - Band Reject Filter - Bandpass Filter Design
		The BPF 2/3 is a 3-helical resonator bandpass filter with aperture-coupling between the resonators.
		The filters are delivered in two basic models: The BPBR-types have the reject range on the high side of the pass frequency and the BRBP-types have the reject range situated on the low side of the pass frequency.
		The filter has very small physical dimensions owing to the use of high-Q, temperature compensated helical resonators The housing is made of extruded aluminium, the chassis of passivated steel, and teflon insulation has been applied in the rigid coaxial cables and in the connectors.
	www.procom-dk.com /filter/c0201-bandpass-filter (967 words)

	Design Chebychev bandpass filters efficiently
		In this kind of filter, the walls of the cavity, the long cylinders, the buckets under the cylinders and the disk-shaped objects near the first and last cylinder are all made of metal.
		Filter theory provides the values for the lumped inductors and capacitors that are needed to obtain the desired filter characteristic.
		This procedure produces a filter with the dimensions of: length of the two outermost resonators: 113.44 mm; length of the five inner resonators: 114.684 mm; antenna distance: 1.928 mm; distances between resonators: 25.286 mm, 28.3 mm and 28.78 mm.
	rfdesign.com /mag/radio_design_chebychev_bandpass/index.html (2154 words)

	What is a Band Pass Filter?
		While there are separate terms for the opposite of a bandpass filter - the notch and band reject - there are no corresponding terms to differentiate between a high Q bandpass filter - covered by this item - and a low Q bandpass filter.
		This means that the two pole filter bandpass filter is effectively putting a single pole on the low frequency end and a single pole on the high frequency end of the passband.
		The group delay of a bandpass filter is greatest at the center frequency, and becomes longer as the Q of the filter increases.
	www-k.ext.ti.com /SRVS/Data/ti/KnowledgeBases/analog/document/faqs/bandpass.htm (808 words)

	Phase correction circuit employing bandpass filters - Patent 4409562
		The signal, having passed the bandpass filters 21 and 22, is divided by the divider 35 and 36 into the signals indicated as a.sub.1 and b.sub.1.
		In this circuit, 51 and 52 are bandpass filters; 53, 55 and 56 are 1/2 divider circuits; 54 is a frequency converter; and 57 and 58 are Exclusive-OR circuits.
		In this figure, 61 and 62 are bandpass filters; 63, 64, 67 and 68 are 1/2 dividers; 65 and 69 are phase detectors; and 66 and 60 are phase inverters (using Exclusive-OR circuits).
	www.freepatentsonline.com /4409562.html (3443 words)

	Band-pass filter -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-06)
		A band-pass filter is (usually) an electronic circuit that lets through (Click link for more info and facts about frequencies) frequencies between two other given frequencies.
		For example, an ideal bandpass filter would let through all signals above 30 (The unit of frequency; one Hertz has a periodic interval of one second) Hz but below 100 Hz.
		In practice, no bandpass filters are ideal and do not attenuate frequencies just outside the desired frequency range completely.
	www.absoluteastronomy.com /encyclopedia/b/ba/band-pass_filter.htm (387 words)

	Bandpass Filters (Site not responding. Last check: 2007-11-06)
		Below the main filter is an equivalent filter using transformers to match the filter to a 50 ohm load.
		A filter was built and the resonators tuned at the center frequency of 10.125 MHz.
		R term represents the input and output impedance of the filter and impedance matching is usually performed with transformers and/or resistors.
	www.qrp.pops.net /bandpass.htm (1184 words)

	Bandpass Filter General/Technical Info (Site not responding. Last check: 2007-11-06)
		Bandpass filters are one of the simplest and most economical ways to transmit a well-defined band of light, and to reject all other unwanted radiation.
		When a filter is used with non-collimated light such as convergent or divergent rays, the wavelength shift will appear somewhat less than that of collimated light at the same angle.
		All of our bandpass filters are stabilized to prevent drift of peak wavelength with age and are hermetically sealed for maximum humidity protection.
	www.andovercorp.com /Web_store/General_info/Technical.html (902 words)

	Digital Filters - Frequency Filters
		Bandpass filtering can be used to enhance edges (suppressing low frequencies) while reducing the noise at the same time (attenuating high frequencies).
		We obtain the filter function of a bandpass by multiplying the filter functions of a lowpass and of a highpass in the frequency domain, where the cut-off frequency of the lowpass is higher than that of the highpass.
		To perform the frequency filtering we transform both the image of the house and the mask into the Fourier domain where we multiply the two images with the effect that the frequencies occurring in the mask remain in the output while the others are set to zero.
	homepages.inf.ed.ac.uk /rbf/HIPR2/freqfilt.htm (2854 words)

	Optical filters from Barr Associates - Types of optical filters: absorption filters bandpass filters beamsplitters beam ... (Site not responding. Last check: 2007-11-06)
		Whether the requirement is for a UV bandpass filter, a narrowband filter in the visible spectrum with several angstroms bandwidth, or for a wideband filter in the infrared spectrum with several microns bandwidth, Barr has the engineering and manufacturing capability to meet the challenge.
		For example, filters with bandwidth of several angstroms can be provided in the visible spectral range and filters with bandwidth spanning several microns can be provided in the infrared.
		Filters are supplied as unmounted or in customer-specified or provided mounts and holders such as filter wheels.
	www.barrassociates.com /opticalfilters.php?type=bandpass (802 words)

	Electroluminescent Receiver - Receiver Range/SSB Modifications/Modifying NBPF/VFO Frequencies
		This widens the bandwidth of the filter for SSB reception.
		There are unlabeled holes in the bandpass filters for the addition of a capacitor for lowering the range of the filter, or for fine tuning.
		SPST switches for the bandpass filters and crystal filters are installed on the board, and are switching to ground.
	www.pan-tex.net /usr/r/receivers/elrvforangeswl.htm (1565 words)

	Andover Filter Glass
		Filter glass is unique in that it transmits a very broad band of light, and is generally characterized as either longpass or bandpass.
		Many of the bandpass filters are used to enhance the signal-to-noise ratio of illumination systems, whereas the longpass filters are used as order/wavelength sorting filters.
		Since these filters are highly absorbing, the effects of angle of incidence, and ambient temperature, are different from the all-dielectric type.
	www.andovercorp.com /Web_store/Filter_Glass/filter_glass.html (337 words)

	Dunestar Systems: Bandpass Filters FAQ (Site not responding. Last check: 2007-11-06)
		Without bandpass filtering, phase noise and overload hamper receiver performance, even if you are running only low power.
		The Model 300 and 600 use the same filter module and are identical for all practical purposes.
		A bandpass filter will help to bring IMD problems under control and usually eliminates the vast majority of the interference.
	www.dunestar.com /filtFAQ.htm (325 words)

	Frame1 (Site not responding. Last check: 2007-11-06)
		All filtering elements are thermally tuned by a calibrated precision oven and by varying the etalon temperature the observer is able to optimize contrast and engage in Doppler studies.
		Filters operate with optical systems as fast as f/20 but due to anticipated heat loads we do not recommend apertures larger than 80 mm.
		Currently the DayStar T-Scanner Filter system are running on a 4 to 6 month schedule; ATM Filter systems are running on a 4 to 6 month schedule; University Filter systems are running up to a 6 month or more delivery schedule depending on customer requirements.
	members.aol.com /jpegemini/jeffsastro.html (2201 words)

	Multiple Feedback Bandpass Filter
		The multiple feedback bandpass filter is a simple looking design, but it is difficult to calculate the values for a given set of parameters.
		The Q of a filter determines its bandwidth, and this is especially true of bandpass filters.
		A filter with a Q of 10 (which is too high to be useful in most audio applications), has a bandwidth that is 1/10th of the centre frequency.
	sound.westhost.com /project63.htm (1552 words)

	Arrangement of bandpass filters
		When we design the arrangement of filters so as to cancel the influence of the center-frequency distribution on the final result, the non-linear phase term is eliminated in Eq.(22).
		If we design each of the band-pass filters to have the same Q value, then the spectral phase given in Eq.(25) is common to all the filters.
		Furthermore, Eq.(23) indicates that the band-pass filters distribute uniformly over the logarithmic frequency: a bank of constant-Q filters is thus constructed.
	www.mlab.ice.uec.ac.jp /mit/Echo/node9.html (159 words)

	Filters RF \| Telephone (Site not responding. Last check: 2007-11-06)
		Use bandpass filters anywhere that critical single band performance is required, or where nearby transmitting stations cause interference to needed communications.
		Individual twin tuned circuit bandpass sections are mounted to the copper chassis with all connections soldered and joined with copper strap lines, switched with double pole individually scaled RF relays.
		Filter circuit is 11 sections overall, 75 ohms, and constructed in a fully shielded 1/8" thick aluminum chassis housing with 'F' connector female input and output for fast, convenient connection to line and receiver terminals.
	www.arraysolutions.com /Products/ice/filtersrf.html (1342 words)

	[No title]
		A bandpass filter passes a range of frequencies while rejecting frequencies outside the upper and lower limits of the passband.
		The quality factor represents the sharpness of the filter, or rate that the amplitude falls as the input frequency moves away from the center frequency during the first octave.
		For a single op-amp bandpass filter with both capacitors the same value, the Q factor must be greater than the square root of half the gain, so that a gain of 98 would require a Q factor of 7 or more.
	ourworld.compuserve.com /homepages/Bill_Bowden/opamp.htm (1349 words)

	Interference Bandpass Filters
		These interference filters are based on the Fabry-Perot effect.
		The typical structure of these filters is two stacks of highly reflective layers, which are separated by a multiple half wave thick spacer.
		This pattern forms a cavity and typically two or three cavities are superimposed to reduce the half width of the transmission spectrum.
	www.lambda.cc /PAGE159.htm (162 words)

	CATV PRODUCTS- Bandpass Filters
		These bandpass filters can be used to clean up the desired channel at the input of the processor or at the output before combining.
		Series 3278 UHF bandpass filters are available in two, three or four cavity models to provide three different configurations that are increasingly selective.
		This filter is used for isolating a desired FM channel in the presence of strong interference from undesired signals.
	www.microwavefilter.com /bandpass.htm (313 words)

	band pass filters
		LC Band pass filters are usually LC filters containing resonator combinations of inductance and capacitance which are designed mathematically to respond to design frequencies while rejecting all other out of band frequencies.
		Because LC bandpass filters have inherent limitations these statements should not be taken too literally.
		LC Band pass filters are derived from tables named after the mathematicians who did the original calculations.
	www.electronics-tutorials.com /filters/band-pass-filters.htm (1561 words)

	LC Filters
		Also whilst a LC bandpass filter is particularly helpful in reducing image interference it is not the panacea for all ills.
		Bandwiths of LC bandpass filters are more a function of the loaded Q of the circuit which in turn is determined by the terminating resistances.
		I have endeavoued to provide sufficient hyperlinks to filter basics, low pass, high pass and bandpass filters so you can jump out if necessary and then come back to me. I have done some layout revision because it was pretty scatty - thanks to all those who continue to email constructive comments and suggestions.
	my.integritynet.com.au /purdic/lcfilters.htm (675 words)

	active bandpass filters
		Active band pass filters (sometimes spelt bandpass) are simply filters constructed by using operational amplifiers as active devices configured to simulate inductors or what are known as "gyrators".
		Active band pass filters are used largely at audio frequencies where otherwise the size of the inductor would become prohibitive.
		Active band pass filters are simply filters constructed by using operational amplifiers as active devices configured to simulate inductors or what are known as "gyrators".
	www.electronics-tutorials.com /filters/active-bandpass-filters.htm (1251 words)

	Holographic Laser Bandpass Filters
		Our Holographic Laser Bandpass Filters are fabricated by recording interference patterns formed between two mutually coherent laser beams, unlike conventional interference filters, which are made by vacuum evaporation techniques.
		These filters represent a major technical breakthrough in the optical filtering of unwanted plasma lines or fluorescence from laser sources.
		By using the unexpanded laser beam and combining high laser throughput with narrow spectral bandwidth, the Holographic Bandpass Filter provides the user with a previously unattainable level of performance.
	www.kosi.com /filters/lbpf.html (293 words)

	Bandpass Filters
		Filters pass one specific TV channel, reject adjacent channels, and all out-of -band frequencies.
		Bandpass filter network consists of adjacent channel lowpass and highpass joined together to form a wide bandpass.
		Custom wide bandpass, is designed to pass specified frequency band with excellent selectivity.
	www.tinlee.com /BandPass_Matv_Catv.htm (743 words)

	A generalized treatment for the mathematical relationships that exist between Q and bandwidth expressed in octaves for ...
		A bandpass filter is characterized by three major parameters - center frequency, amplitude response (gain) and bandwidth.
		Once the filter has been designed, then Q is easily calculated by measuring the -3 dB frequency points, taking the difference and dividing that into the center frequency, and lastly, the bandwidth in octaves is then calculated.
		For reference purposes, Figure 1 shows a bandpass filter with its associated parameters labeled for clarity and is used for derivation purposes.
	www.svconline.com /mag/avinstall_generalized_treatment_mathematical (863 words)

	Designing Bandpass Filters
		A bandpass filter can be thought of as a cascade of a high pass and low pass filter:
		The frequency region between f1 and f2 is termed the filter bandpass, i.e.
		At these frequencies, the output voltage is 0.707 times the output voltage in the bandpass region; the significance of this value is that the filter output will only supply one-half of the power it is capable of supplying to a load in the bandpass frequency range.
	www.seas.upenn.edu /ese/rca/courses/ee206/miniproject2/bandpass.html (400 words)

	WX0B BPF
		These filters and filter switching systems are based on the article in the May and June1998 QST article by Ed Wetherhold, W3NQN.
		We know these filters achieve a level of selectivity and a level of low in-band insertion loss that will be the benchmark for all other filters to be measured by.
		To make the filters more flexible for an SO2R type of operation it is necessary for the operator to be able to listen on two bands at the same time, and be able to switch bands quickly.
	www.arraysolutions.com /Products/wx0bbpf6.htm (1492 words)

	complex bandpass filters (Site not responding. Last check: 2007-11-06)
		Bandpass filters are derived from tables named after the mathematicians who did the original calculations.
		The following filter calculations may be depicted in other publications in another format but you will essentially arrive at the same answer.
		In our case we are going to design and construct a front end filter for a receiver which operates between 7.0 and 7.2 Mhz.
	my.integritynet.com.au /purdic/complx_bpf.html (1163 words)

	[CQ-Contest] Bandpass filters for M/S or M/M environment
		Mihail, Some of the best filters I have seen so far for M/S or M/2 are the Dunestar 600's.
		If you are planning on going for M/M, you won't want switchable bandpass filters on each station, luckily Dunestar has you covered there as well, with their model 300's.
		These are single band filters, and are very hard to notch out.
	lists.contesting.com /pipermail/cq-contest/2004-June/057135.html (470 words)

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