Delhi High Court Upholds Canadian Firm’s Split-Sector Antenna Patent, Holds Rosenberger Liable for Infringement
Introduction
The Delhi High Court decreed a patent infringement suit in favour of the Canadian company Communication Components Antenna Inc., upholding the validity of its split-sector antenna patent and holding multiple entities within the Rosenberger Group liable for infringement. The Court rejected the defendants’ revocation challenge and criticised their reliance on scattered prior art references as an impermissible hindsight exercise.
Factual Background
Communication Components Antenna Inc. is the proprietor of a patent covering split-sector antenna technology using asymmetrical beams designed to maintain required coverage areas with improved efficiency. The company alleged that Rosenberger Hochfrequenztechnik GmbH & Co. KG, Prose Technologies India Private Limited, Rosenberger Asia Pacific Electronic Co. Ltd., and Prose Technologies (Suzhou) Co. Ltd. were manufacturing and dealing in antenna products that reproduced the patented beam patterns and technical architecture.
The plaintiff relied on the defendants’ own product literature and publicly available technical documents to demonstrate that the rival antennas embodied the patented split-sector asymmetrical beam configuration.
Procedural Background
The plaintiff instituted a suit before the Delhi High Court seeking permanent injunction, damages, and other consequential reliefs for patent infringement. The defendants contested the suit by filing a revocation challenge, alleging lack of novelty, absence of inventive step, insufficiency of disclosure, and ambiguity in technical terms used in the specification.
Justice Prathiba M. Singh delivered judgment on March 30, 2026, deciding both infringement and validity issues.
Issues
1. Whether the plaintiff’s split-sector antenna patent was valid and enforceable under the Patents Act.
2. Whether the defendants’ antenna products infringed the patented asymmetrical beam technology.
3. Whether the prior art references cited by the defendants established lack of novelty or inventive step.
Contentions of Parties
The plaintiff contended that the defendants’ antennas reproduced the patented asymmetrical beam patterns and relied on beam comparison studies as well as the defendants’ own technical brochures. It was further argued that the defendants had withdrawn certain technical material from the public domain during the proceedings, which indicated an attempt to obstruct proof of infringement.
The defendants challenged the patent on grounds of invalidity, contending that the invention lacked novelty and inventive step in view of multiple prior art references. They also argued that the patent specification did not sufficiently disclose the invention and that expressions such as “critical coverage area” were vague.
Reasoning and Analysis
The High Court firmly rejected the revocation challenge. It held that the defendants’ attempt to combine multiple prior art documents around the patented invention amounted to what the Court described as the “DARTBOARD MODEL” an impermissible hindsight reconstruction where scattered prior art references are thrown at the patented invention after knowing its solution. The Court observed that such hindsight-driven attacks impose unnecessary litigation burdens and ought to be discouraged.
On validity, the Court found that the defendants had failed to establish any sustainable ground for revocation. The claimed invention was held to possess novelty and inventive merit, while the specification was found sufficiently clear for a person skilled in the art. Technical expressions such as “critical coverage area” were held to be well understood in the relevant field.
On infringement, the Court accepted the plaintiff’s comparison of the defendants’ beam patterns and product literature. It also drew an adverse inference from the defendants’ conduct in withdrawing technical documents previously available in the public domain, describing such conduct as “suspect.” The Court held that the plaintiff had successfully demonstrated that the rival products embodied the essential patented features.
Decision
The Delhi High Court upheld the plaintiff’s patent as valid and enforceable, rejected the defendants’ revocation challenge, and decreed the suit for infringement. The Rosenberger Group entities were held liable for patent infringement and directed to pay damages, including damages assessed on the basis of licensing benchmarks.
In this case the plaintiff was represented by Senior Advocate Gaurav Pachnanda with Advocates Sidhant Goel, Mohit Goel, Deepankar Mishra, Aditya Goel & Avni Goel.