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ITEM IDENTIFICATION & OVERVIEW

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• Item Type: Microwave Cavity / Stripline RF Bandpass Filter

• Manufacturer: Microphase Corporation (Greenwich, Connecticut, USA)

• CAGE / FSCM Code: 01341 (Microphase Corp.)

• Federal Supply Class (FSC): 5915 (Filters and Networks)

• National Stock Number (NSN):

- Subassembly Level: Built under military/defense contract specification;

typically classified under FSC 5915 (e.g., 5915-XX-XXX-XXXX).

- Standard military cross-reference shows this part was manufactured as a

custom/dedicated receiver subsystem module for a prime contractor radar/EW

assembly rather than an off-the-shelf general supply stock number.

• Primary Part / Drawing Number: 65D13703-001 (or 6SD13703 / 001)

• Label Designation: "FILTER, BAND PASS"

• Function Label (Embossed Tape): "S BAND WIDE IF FILTER"

• Port Designations: J1 (RF In/Out), J2 (RF Out/In)

• Inspection/Test Stamp: FTV (Factory Acceptance / Test Verification)

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TECHNICAL SPECIFICATIONS

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• Operating Frequency Range: S-Band (Nominal range: 2.0 GHz to 4.0 GHz)

• Passband Profile: Wide Intermediate Frequency (IF) Bandpass

• Architecture / Construction:

- Heavy-duty milled aluminum chassis / cavity housing with RF perimeter shielding

- Multi-pole interdigital or combline cavity resonator design

- Mechanical tuning / adjustment screws positioned along resonant cavity paths

• Impedance: 50 Ohms (Standard RF/Microwave)

• Connectors: 2x 50Ω SMA Female (Gold-plated, 2-hole flange mount)

• Directivity / Symmetry: Passive reciprocal 2-port network (bilateral J1/J2)

• Power Handling: Typical small-signal IF / receiver level (<1W to 5W CW max)

• Out-of-Band Rejection: High-order attenuation steepness designed to sharply

suppress local oscillator (LO) leakage, image responses, and out-of-band harmonics.

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ORIGINAL MILITARY & INDUSTRIAL USES

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1. Superheterodyne Radar Receivers:

- Installed in the Intermediate Frequency (IF) processing chain of military

S-band radar systems to define receiver channel bandwidth and reject mixer

spurs.

2. Electronic Warfare (EW) / ESM Systems:

- Used in wideband surveillance and signal intercept receivers to isolate

wideband blocks of downconverted RF spectrum before analog-to-digital

conversion or channelization.

3. Satellite Communications (SATCOM) Ground/Airborne Terminals:

- Pre-selection or post-mixer filtering in uplink/downlink microwave converters

operating within standard S-band frequencies.

4. Microwave Telemetry & Missile Tracking Systems:

- Filtering tracking telemetry signals in range instrumentation equipment.

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THEORETICAL, HOBBYIST & LABORATORY RE-USE

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1. Software Defined Radio (SDR) Front-End Preselection:

- Placed inline before high-end SDR receivers (HackRF, BladeRF, USRP, RTL-SDR

with downconverters) to eliminate out-of-band overload and desensitization

from high-power cell towers (LTE/5G) or broadcast transmitters.

2. Amateur Radio (Ham Microwave Operations):

- Adaptable for 13 cm amateur radio band operations (2.3 GHz – 2.4 GHz) or

amateur satellite reception (e.g., QO-100 downlink IF conversion chains).

3. 2.4 GHz Wi-Fi / ISM Band Out-of-Band Filtering:

- High-attenuation cavity filtering for 2.4 GHz experimental telemetry, high-gain

directional links, or drone video feeds operating in RF-congested environments.

4. RF Lab Test Bench & Signal Generator Filtering:

- Harmonic suppression on microwave frequency sweepers, synthesizers, and

comb generators to clean up spurious signals during RF bench testing.

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Brand	Microphase
MPN	65D13703-001
Country of Origin	United States

Microphase 65D13703-001 S-Band Wide IF Bandpass Cavity Filter SMA Microwave RF

Specifications