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COAXIAL CAVITIES
Box 22 Tel. +358 9 2790 120 http://www.aerial.fi
04401 Järvenpää Fax +358 9 2910 210 aerial@aerial.fi
Fin...
COAXIAL CAVITIES
Box 22 Tel. +358 9 2790 120 http://www.aerial.fi
04401 Järvenpää Fax +358 9 2910 210 aerial@aerial.fi
Fin...
COAXIAL CAVITIES
Box 22 Tel. +358 9 2790 120 http://www.aerial.fi
04401 Järvenpää Fax +358 9 2910 210 aerial@aerial.fi
Fin...
COAXIAL CAVITIES
Box 22 Tel. +358 9 2790 120 http://www.aerial.fi
04401 Järvenpää Fax +358 9 2910 210 aerial@aerial.fi
Fin...
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Filters and cavities - Suotimet

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Our Coaxial cavity filters

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Filters and cavities - Suotimet

  1. 1. COAXIAL CAVITIES Box 22 Tel. +358 9 2790 120 http://www.aerial.fi 04401 Järvenpää Fax +358 9 2910 210 aerial@aerial.fi Finland DESCRIPTION Aerial Oy supplies coaxial cavity resonators for filter applications. Different kinds of cavity circuit combinations can be constructed to reject interfering frequencies or to isolate receivers or transmitters when using a common antenna. Power rating, transmission and VSWR values depend on the selected cavity combination, filtered frequencies, interconnection cable and connector types which are all agreed with the customer. Tuning is factory-made at Aerial Oy premises unless agreed otherwise. COAXIAL CAVITIES MECHANICAL AND ELECTRICAL DATA Type CR110-75 CR110-95 CR200-95 CR110-120 CR110-150 CR110-450 Tuning range 68-88 MHz 88-108 MHz 88-108 MHz 118-144 MHz 146-174 MHz 380-470 MHz RF-connector N female N female 7/16 female N female N female N female Diameter ∅ 110 mm ∅ 110 mm ∅ 200 mm ∅ 110 mm ∅ 110 mm ∅ 110 mm FEATURES § Available as single cavity or multicoupler § Passive element à minimum maintenance, maximum power § Temperature drift compensated by using Invar steel as a conductor piston (tuning rod) material. § Constructed and tuned individually according to the customer’s order § Materials: Aluminium alloy and silver plated brass § Colour: Light grey § High power version CR200-95 available for FM § Installation between antenna and receiver(s) or transmitter(s).
  2. 2. COAXIAL CAVITIES Box 22 Tel. +358 9 2790 120 http://www.aerial.fi 04401 Järvenpää Fax +358 9 2910 210 aerial@aerial.fi Finland TRANSMISSION CURVE CR150-1, Single cavity -80 -70 -60 -50 -40 -30 -20 -10 0 -1 0 1 2 3 4 5 f [MHz] Transmission[dB] -0,5 dB -1 dB -2 dB -3 dB TRANSMISSION CURVE CR150-2, Two cavity combination -80 -70 -60 -50 -40 -30 -20 -10 0 -1 0 1 2 3 4 5 f [MHz] Transmission[dB] -1 dB -2 dB -4 dB -6 dB TRANSMISISON CURVE CR150-3, Three cavity combination -80 -70 -60 -50 -40 -30 -20 -10 0 -1 0 1 2 3 4 5 f [MHz] Transmission[dB] -1,5 dB -3 dB -6 dB BANDPASS FILTERS Shape and steepness of the transmission curve can be adjusted by selecting the most suitable out of four possible positions of the coupling loops which are situated in the front panel of the cavity (see the picture below). However using radical coupling affects also the bandpass attenuation so this feature has to be used deliberately. Adjustable loops are available for cavities with N- connectors only. Illustrating example curves of one, two and three cavity circuits with different loop settings are below.
  3. 3. COAXIAL CAVITIES Box 22 Tel. +358 9 2790 120 http://www.aerial.fi 04401 Järvenpää Fax +358 9 2910 210 aerial@aerial.fi Finland NOTCH FILTERS To reject interfering spot frequencies coaxial cavity circuits can be tuned as notch filters. Some examples of possible 146…174 MHz range patterns are below: TRANSMISSION CURVE CR150-1 Notch filter, single cavity -30 -25 -20 -15 -10 -5 0 -3 -2 -1 0 1 2 3 f [MHz] Transmission[dB] TRANSMISSION CURVE CR150-2 Notch filter, Two cavities -60 -50 -40 -30 -20 -10 0 -3 -2 -1 0 1 2 3 f [MHz] Transmission[dB] TRANSMISSION CURVE CR150-1 Notch filter, single cavity -25 -20 -15 -10 -5 0 -3 -2 -1 0 1 2 3 f [MHz] Transmission[dB] TRANSMISSION CURVE CR150-2 Notch filter, Two cavities -60 -50 -40 -30 -20 -10 0 -3 -2 -1 0 1 2 3 f [MHz] Transmission[dB] TRANSMISSION CURVE CR150-1 Notch filter, Single cavity -25 -20 -15 -10 -5 0 -3 -2 -1 0 1 2 3 f [MHz] Transmission[dB] TRANSMISION CURVE CR150-2 Notch filter, Two cavities -60 -50 -40 -30 -20 -10 0 -3 -2 -1 0 1 2 3 f [MHz] Transmission[dB]
  4. 4. COAXIAL CAVITIES Box 22 Tel. +358 9 2790 120 http://www.aerial.fi 04401 Järvenpää Fax +358 9 2910 210 aerial@aerial.fi Finland Antenna Input Input DUPLEXERS (MULTICOUPLERS) Duplexer circuits can be used to couple multiple receivers or transmitters to a common antenna. This following measured example graph is a FM duplexer which couples two local radio transmitter feed signals together for common feed cable and antenna system. The block diagram of the system is on the right. f1 = 105,2 MHz f2 = 107,7 MHz Bandpass attenuation 0,6 dB Isolation 45 dB System return loss can be matched better than 20 dB for a ±100 kHz frequency band. TRANSMISSION CURVE 2 x CR200-95-2 Duplexer -50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 104 105 106 107 108 109 f [MHz] Transmission[dB] ORDERING INFORMATION To order a correct filter type please contact our sales personnel and be prepared to inform us about the frequencies, bandwidths, Return loss values, power handling, bandpass and band reject attenuation or isolation which are required in your system. You can also leave the decision to our skilled engineers.

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