Isolators

Overview

Isolator used in the mobile-phone network basestation, is placed in the latter half the PA(Power Amplifier) to lower the influence to the PA from the external environment changes and take a role to let the high quality signal transmit in a stable condition. The specification required to the isolators is, (1)lower insertion loss, (2)higher isolation (reverse direction loss), (3)lower intermodulation distortion.As the increase of the frequency bands and the downsizing of the basestation, smaller and high-performance isolators are being required.

In order to meet the demand of the market, we have developed new ferrite-garnet material with Low saturation magnetization and Low ferromagnetic resonance half value, and optimized an RF(radio frequency) circuit with the combination of Low IMD, a magnetic circuit for the High magnetic field and the Capacitor with high Q (Low loss) materials.
With the new material and RF circuit design enabled us to develop the high-performance isolator (ESI-5CM series) to support all the 4G-LTE frequency bands with 5x5mm package.
We have full range of isolator line-ups with 4x4mm, 5x5mm and 7x7mm package.

We propose a method to use materials tailored to your company.

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Figure 1: 5mm square isolator

Figure 2: RF brock diagram of mobile-phone network basestation

In order to meet the demand of the market, we have developed new ferrite-garnet material with Low saturation magnetization and Low ferromagnetic resonance half value, and optimized an RF(radio frequency) circuit with the combination of Low IMD, a magnetic circuit for the High magnetic field and the Capacitor with high Q (Low loss) materials.
With the new material and RF circuit design enabled us to develop the high-performance isolator (ESI-5CM series) to support all the 4G-LTE frequency bands with 5x5mm package.
We have full range of isolator line-ups with 4x4mm, 5x5mm and 7x7mm package.

Fig.4 : Configuration of isolator
Table 1 : Specification of ESI-5CM series
Figure 3: Typical performance of ESI-5CM for LTE Band41