Dielectric Filters


Introductor (DF-A)

Dielectric Filters - DF-A Series
RF Filters For Telecoms Basestation Applications (DF-A)
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Token Offers Dielectric RF Filters for Telecoms. Token has extended the capabilities of its filter product line with the introduction of a new range of dielectric microwave filters to the available frequency range up to 5.8GHz. Token designs and manufactures custom electronic filters for defence, telecommunications and similar application increasing the range of products available to customers.

Two block-type dielectric RF filters for telecoms basestation applications have been added to Token's DF range. The filters have been designed for cellular basestation applications that use a digital pre-distortion amplifier (DPD), as they feature a wide pass band and flat ripple performance, which are required for DPD PA design.

Applications also include RF and microwave communications such as GSM, 3G, GPS, satellite and TV transmission, wireless security systems, radar, CT1, CT2, 900MHz, 1.8GHz, 2.4GHz, 5.8GHz Cordless Phone, wireless earphone, wireless microphone, aerospace and military.

The (DF-A) filter's small size (8.8 x 7.3 x 3.6 mm) means they require more less mounting space compared to Token's previous generation of filters for this application. The filters' highly sophisticated multi-pole design ensures high attenuation and good selectivity. Both the two members of the DF series have a ripple of 1.0 dB max.

In addition, Token enhances custom design capabilities for specialist applications. Our customers will benefit from the additional frequency ranges now available and from the excellent quality and lower costs achievable

Custom parts are available on request. Token will also produce devices outside these specifications to meet specific customer requirements, please contact our sales for more information.

Features :

  1. Suitable for surface mount and reflow soldering.
  2. Excellent mechanical structure and temperature stability.
  3. Good selectivity, low insertion loss for using high Q-value resonators.

Dimensions (Unit: mm) (DF-A)

(DF-A) Dimensions
(DF-A) Dimensions

Typical Specifications (DF-A)

Part No. Center
Band Width
(dB) max.
Ripple in
Band Width
(dB) max.
(dB) min. (MHz)
DF457S30A 457 fo±15 3.0 1.0 2.0 17 at fo+50;   30 at fo-50
DF522S10A 522 fo±5 3.0 0.5 1.6 23 at fo+40;   40 at fo-40
DF683S30A 683 fo±15 2.5 1.0 2.0 20 at fo+64;   30 at fo-64
DF740S30A 740 fo±15 2.0 0.5 1.8 14 at fo+64;   20 at fo-64
DF864S10A 864 fo±5 2.5 0.5 1.5 15 at fo+24;   17 at fo-24
DF915S25A 915 fo±12.5 2.0 1.0 2.0 20 at fo+100;   35 at fo-100
DF903S6A 903 fo±3 3.5 0.5 1.5 32 at fo+24
DF927S6A 927 fo±3 3.5 0.5 1.5 32 at fo-24
DF1890S80A 1890 fo±40 1.5 1.0 2.0 15 at fo+200;   35 at fo-200
DF2403S20A 2403 fo±10 3.0 0.5 1.5 35 at fo+75
DF2475S20A 2475 fo±10 3.0 0.5 1.5 35 at fo-75

Typical Characteristic (DF-A)

Dielectric Filters (DF-A) Type Typical Characteristic I
(DF-A) Type I Typical Characteristic
(Center 915.000MHz Span 400.000MHz)
Dielectric Filters (DF-A) Type Typical Characteristic II
(DF-A) Type II Typical Characteristic
(Center 904.000MHz Span 300.000MHz)
Dielectric Filters (DF-A) Type Typical Characteristic III
(DF-A) Type III Typical Characteristic
(Center 927.000MHz Span 200.000MHz)

Order Codes (DF-A)

DF 864 S 10 A
Part Number
Center Frequency
Connect Type
S SMD type
A 7.3 × 3.6 mm
B 6.0 × 3.0 mm
C 4.5 × 2.0 mm
D 3.6 × 1.8 mm