Coaxial Suspension Line High Pass Filter
Coaxial Suspension Line High Pass Filter allows high-frequency microwave signals while rejecting lower frequencies. Suitable for advanced RF communication systems, radar electronics and high-frequency signal processing.
High-Performance Suspension Line High Pass Filters for Jammer Suppression
AO Microwave’s high-precision coaxial suspension line high pass filters (Suspended Substrate Stripline - SSS) are engineered to block low-frequency signals and jammers while transmitting high-frequency RF signals up to 40 GHz with minimum loss. Built with a thin low-loss Rogers card suspended symmetrically inside a machined aluminum housing, these filters achieve high stopband rejection and low passband insertion loss. Our suspension line high pass filters deliver low insertion losses (typically < 0.6 dB in the passband), an input VSWR of < 1.30:1, and a wide passband extending across multi-octave bands.
By utilizing the air dielectric of the suspended structure, our SSS high pass filters minimize dielectric loss, allowing for extremely wide passbands with sharp transitions. They are critical for blocking low-frequency jammers in electronic warfare (EW) receivers, sub-harmonic suppression, and high-pass instrumentation front-ends.
| Part No | Frequency/GHz | VSWR (Max) | IL/dB (Max) | Stopband Rejection/dB (Min) | Size/mm |
|---|---|---|---|---|---|
| AO1G7G-CSHPF-SK | 1-7 | 1.5 | 1 | 45dB@DC-0.8GHz | 30x24.5x10 |
| AO1G11G-CSHPF-SK | 1-11 | 1.5 | 1 | 70dB@DC-0.7GHz | 30x24.5x10 |
| AO1G12G-CSHPF-SK | 1-12 | 2 | 0.8 | 55dB@DC-0.75GHz | 30x23x10 |
| AO2G10G-CSHPF-SK | 2-10 | 1.5 | 1 | 50dB@DC-1.6GHz | 32x20.5x10 |
| AO2G19G-CSHPF-SK | 2-19 | 2 | 1 | 55dB@DC-1.55GHz | 27x20x10 |
| AO2G14.5G-CSHPF-SK | 2-14.5 | 2 | 1.2 | 65dB@DC-1.6GHz | 38x35x10 |
| AO2.5G14G-CSHPF-SK | 2.5-14 | 2 | 1 | 60dB@DC-2.1GHz | 46x34x10 |
| AO2.8G10G-CSHPF-SK | 2.8-10 | 2 | 1 | 60dB@DC-2.1GHz | 34x33x10 |
| AO3G18G-CSHPF-SK | 3-18 | 1.7 | 1 | 60dB@DC-2.5GHz | 32x17.5x10 |
| AO3G24G-CSHPF-SK | 3-24 | 2 | 1 | 50dB@DC-2.35GHz | 24x16x10 |
| AO3.55G18G-CSHPF-SK | 3.55-18 | 2 | 1.5 | 60dB@DC-2.8GHz | 32x18x10 |
| AO3.8G15G-CSHPF-SK | 3.8-15 | 2 | 1 | 25dB@DC-3.4GHz | 32x28x10 |
| AO4G20G-CSHPF-SK | 4-20 | 2 | 1 | 50dB@DC-3.4GHz | 24x18x10 |
| AO4.3G18G-CSHPF-SK | 4.3-18 | 2 | 1.2 | 30dB@DC-3.8GHz | 24x18x18 |
| AO5G18G-CSHPF-SK | 5-18 | 2 | 1 | 50dB@DC-4.2GHz | 25x26x10 |
| AO5.5G18G-CSHPF-SK | 5.5-18 | 2 | 2 | 50dB@DC-3.5GHz | 26x29x10 |
| AO6G18G-CSHPF-SK | 6-18 | 2 | 1 | 50dB@DC-5.1GHz | 26x26x10 |
| AO6G18G-CSHPF-SK-A2 | 6-18 | 2 | 1.5 | 60dB@DC-5.1GHz | 26x26x10 |
| AO6G18G-CSHPF-SK-C2 | 6-18 | 2 | 2 | 55dB@DC-5.4GHz | 26x28x10 |
| AO7G18G-CSHPF-SK-C1 | 7-18 | 2 | 1 | 50dB@DC-6GHz | 26x24x10 |
| AO7G18G-CSHPF-SK-C2 | 7-18 | 2 | 1.5 | 30dB@DC-6.425GHz | 26x24x18 |
| AO7.5G18G-CSHPF-SK | 7.5-18 | 2 | 1.5 | 50dB@DC-6.9GHz | 25x30x10 |
| AO7.625G18G-CSHPF-SK | 7.625-18 | 2 | 1.2 | 30dB@DC-7.125GHz | 25x30x10 |
| AO8G18G-CSHPF-SK | 8-18 | 2 | 1 | 50dB@DC-6.5GHz | 21x26x10 |
| AO9G18G-CSHPF-SK | 9-18 | 2 | 1.5 | 50dB@DC-7.8GHz | 23x26x10 |
| AO10G18G-CSHPF-SK | 10-18 | 2 | 1 | 50dB@DC-5.85GHz | 20x16x10 |
| AO10G40G-CSHPF-2.92K | 10-40 | 2 | 1.5 | 60dB@DC-5GHz | 20x16x10 |
| AO12G18G-CSHPF-SK | 12-18 | 2 | 1 | 60dB@DC-10.5GHz | 27.5x26x10 |
| AO18G40G-CSHPF-2.92K | 18-40 | 2 | 2.7 | 25dB@DC-17GHz | 20x13x10 |
| AO26G50G-CSHPF-2.4K | 26-50 | 2 | 2.5 | 45dB@DC-23GHz | 20x15x12.7 |
| AO30G50G-CSHPF-2.4K | 30-50 | 2 | 2.5 | 35dB@DC-28GHz | 13.2x15x12.7 |
Series Capacitors & Inductive Stubs in SSS High Pass Filters
Suspension line high pass filters operate by utilizing series capacitors and shunt inductive stubs. High-frequency signals pass easily through the series capacitors, while low-frequency components are shunted to ground by the inductive stubs.
To achieve high out-of-band rejection and steep transition sharpness, these elements must be precisely managed. AO Microwave utilizes interdigital printed series capacitors on suspended substrates to minimize parasitic inductance, ensuring low passband insertion loss and steep roll-off characteristics.
Target Applications & Operational Advantages
By providing low insertion loss and high mechanical durability, our suspension line high pass filters enable reliable performance in active systems:
Wideband EW Receiver Protection
Function: Blocks strong low-frequency jammer signals (e.g., FM, cellular) from saturating wideband receiver front-ends.
Advantage: Sharp transition selectivity and low passband insertion loss (<0.6 dB) preserve receiver sensitivity.
Sub-Harmonic Suppression
Function: Blocks sub-harmonics at the input of multipliers and frequency converters.
Advantage: Exceptional stopband rejection suppresses sub-harmonic leakage, ensuring clean upconverted signals.
High-Pass Instrumentation Front-Ends
Function: Filters low-frequency noise in high-frequency test and measurement setups.
Advantage: Wide passband extending up to several times the cutoff frequency allows for wideband measurements.
Suspension Line High Pass Filter FAQs
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