RF Antenna 3961D Equivalent & Substitute Parts

Part Overview

The PCTEL 3961D is a 1.575GHz GNSS/GPS ceramic patch RF antenna designed for navigation applications operating in the UHF frequency band (1GHz ~ 2GHz). The antenna features a 150mm cable with integrated LNA, MCX termination, and adhesive mounting. The product is classified as obsolete, necessitating identification of functionally equivalent substitute components for ongoing system support and new design implementations.

Substiute Parts

3961D

PCTEL, Inc.In Stock: 7603961D Datasheet

Current PartRFQ

3961D-HR

PCTEL, Inc.In Stock: 8363961D-HR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3961D is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency (Center/Band): 1.575GHz
• Frequency Range: 1.565GHz ~ 1.585GHz
• Antenna Type: Ceramic Patch
• Number of Bands: 1
• Applications: GNSS, GPS
• Mounting Type: Adhesive
• RF Family/Standard: Navigation

Compatible Variance Parameters:

• VSWR: Tolerance range allows values up to 2.0
• Gain: Both -2dBic and 3dBic configurations are acceptable
• Height (Max): Variance within 0.315" (8.00mm) envelope
• Termination: MCX or equivalent RF connector interface
• Cable Configuration: 150mm cable with LNA integration

The 3961D-HR qualifies as a direct substitute based on matching all mandatory parameters while operating within acceptable variance limits for VSWR and physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

3961D-HR as Primary Substitute:

The 3961D-HR is the direct equivalent for the obsolete 3961D. Both components operate at identical center frequency (1.575GHz) and frequency range (1.565GHz ~ 1.585GHz) with matching antenna type, gain specifications, and application scope. The 3961D-HR demonstrates superior compliance posture with RoHS certification and includes integrated filter functionality in addition to the LNA. The VSWR variance (2.0 versus 1.5) remains within acceptable engineering tolerances for GNSS/GPS navigation applications. Physical dimensions are compatible within the mounting envelope, with the 3961D-HR providing a more compact profile (7.70mm versus 8.00mm height).

Compliance Considerations:

Both components share identical ECCN (7A994) and HTSUS (8529.10.4040) classifications. The 3961D-HR's RoHS compliance status provides regulatory advantage for applications subject to environmental directives.

Inventory and Availability:

The 3961D-HR maintains adequate stock levels (769 pcs) for production requirements. Both components are classified as obsolete, indicating limited future availability.

Frequently Asked Questions (FAQ)

Q: Can the 3961D-HR directly replace the 3961D in existing designs?

A: Yes. The 3961D-HR operates at identical center frequency (1.575GHz) and frequency range (1.565GHz ~ 1.585GHz) with matching antenna type, gain, and mounting configuration. The VSWR variance (2.0 versus 1.5) and compact physical profile (7.70mm versus 8.00mm) are within acceptable engineering tolerances for GNSS/GPS applications.

Q: What is the significance of the VSWR difference between the two parts?

A: The 3961D operates at VSWR 1.5, while the 3961D-HR operates at VSWR 2.0. Both values are acceptable for navigation-band antenna applications. VSWR 2.0 represents a standard engineering tolerance threshold and does not compromise performance in GNSS/GPS receiver systems.

Q: Does the 3961D-HR include additional features compared to the 3961D?

A: The 3961D-HR includes integrated filter functionality in addition to the LNA present in both designs. The 150mm cable configuration is identical. The filter addition provides enhanced signal conditioning without modifying the core RF characteristics.

Q: Are there packaging differences between the two parts?

A: The 3961D is specified with standard packaging, while the 3961D-HR is supplied in bulk packaging. Both maintain identical electrical and mechanical specifications. Packaging selection depends on procurement and assembly requirements.

Q: What is the compliance status difference?

A: The 3961D-HR is explicitly RoHS compliant, while the 3961D compliance status is not specified. For applications subject to environmental directives or customer requirements, the 3961D-HR provides documented compliance assurance.

Q: Are the termination specifications identical?

A: The 3961D specifies MCX termination. The 3961D-HR termination is not specified in the provided data. Both components operate within the Navigation RF family standard and maintain functional compatibility for GNSS/GPS applications.

Q: What is the height difference impact on mounting?

A: The 3961D-HR height (7.70mm) is 0.012" (0.30mm) lower than the 3961D (8.00mm). This dimensional variance remains within typical adhesive mounting tolerances and does not affect mechanical or electrical performance in standard GNSS/GPS receiver installations.