Terms of Use

Acceptance of These Terms

By accessing, browsing, or using any part of the Site, including any calculator or simulator, you confirm that you have read, understood, and agree to these Terms. If you use the Site on behalf of a company, university, or other organisation, you agree to these Terms on its behalf and confirm that you have authority to do so.

Who May Use the Site

The Site is intended for individuals aged 16 and over. Younger students may use the educational content only with the involvement and supervision of a parent, guardian, or teacher, who accepts these Terms on their behalf.

Educational Purpose Only

All calculators, simulations, worked examples, articles, and guides on the Site are provided for general educational and informational purposes and for preliminary design exploration only.

• Nothing on the Site is professional engineering advice, a design review, a certification, or a guarantee of performance, safety, or regulatory compliance.
• Using the Site does not create any professional, consulting, or advisory relationship between you and NEXT ANTENNAS.
• Nothing on the Site replaces the judgement of a qualified, and where required licensed, engineer who is responsible for your design.

Accuracy and Verification of Results

Our tools are built on published theory and closed-form equations (for example Balanis, Pozar, and Hammerstad–Jensen) and on simplified numerical models such as 2D finite-element, method-of-moments, and FDTD solvers. Every model depends on assumptions and approximations, including idealised or datasheet material properties, finite mesh resolution, simplified feeds, ground planes and boundary conditions, and nominal dimensions.

Results may be inaccurate, incomplete, or out of date, may contain errors in the underlying equations or software, and may differ significantly from real hardware because of substrate variation, fabrication and etching tolerances, connectors, cables, enclosures, nearby objects, environmental conditions, and the measurement setup.

You must independently verify any result before relying on it for a design, a product, a purchase, a manufacturing order, a certification, a regulatory filing, or any decision affecting safety. At a minimum, we strongly recommend that you:

• Consult an expert — have the theory, assumptions, and results reviewed by a qualified RF, microwave, or antenna engineer.
• Confirm in reputable simulation software — re-simulate the design in an established full-wave electromagnetic solver such as Ansys HFSS, CST Studio Suite, Altair Feko, Keysight ADS / Momentum, Sonnet, or a comparable professional tool.
• Measure a prototype — for example with a calibrated vector network analyzer for S11, VSWR, and impedance, and in an antenna range or anechoic chamber for radiation pattern, gain, and efficiency.

RF Safety and Regulatory Compliance

You are solely responsible for:

• Licensing and spectrum rules — making sure any transmitter you build or operate is licensed or authorised where required, stays within permitted frequencies, power levels, and emission limits, and complies with the rules that apply to you (for example FCC Part 15 or Part 97 in the United States, or their equivalents elsewhere).
• Equipment certification — obtaining any testing, certification, or approval a product requires before it is marketed or sold.
• Physical safety — following safe practice when working with RF power, high voltage, test equipment, antennas, masts, towers, and rooftops, including staying well clear of power lines, using fall protection, and observing exposure limits for yourself and others.

RF energy, electricity, and work at height can cause serious injury or death. If you are unsure, stop and consult a qualified professional.

Your Responsibilities

When using the Site you agree to:

• check that the inputs, units, and assumptions you enter are correct and suitable for your application;
• use the Site lawfully and in accordance with these Terms; and
• keep copies of anything you need, since calculator inputs and results are processed in your browser and are not stored by us.

Prohibited Uses

You must not:

• use the Site for any unlawful purpose, or to design, build, or operate equipment intended to cause harmful interference, jam communications, or harm people;
• copy, scrape, crawl, mirror, or bulk-download the Site, its calculators, or its content by automated means, except for normal search-engine indexing;
• copy, reverse engineer, decompile, or republish our calculator or simulator code, or build a competing service from it;
• remove or alter any copyright, trademark, or attribution notice;
• present our content or results as your own, or as having been reviewed, endorsed, or certified by NEXT ANTENNAS;
• interfere with, overload, or attempt to gain unauthorised access to the Site, its servers, or its networks, or introduce malware; or
• use the Site to train or improve any machine-learning or AI model without our prior written permission.

Intellectual Property

The Site and its content, including text, graphics, diagrams, logos, calculator and simulator software, and their design and arrangement, are owned by NEXT ANTENNAS or its licensors and are protected by copyright, trademark, and other laws. The NEXT ANTENNAS name and logo are our trademarks.

We grant you a limited, personal, non-exclusive, non-transferable, revocable licence to use the Site for your own learning and for personal, academic, or internal professional work. You may:

• use the numerical results you generate in your own designs, reports, and coursework; and
• quote short excerpts of our content with clear attribution and a link to the source page.

Any other copying, reproduction, distribution, or commercial use requires our prior written permission. All rights not expressly granted are reserved.

Ansys HFSS, CST Studio Suite, Altair Feko, Keysight ADS, Sonnet, and other product names mentioned on the Site are trademarks of their respective owners. NEXT ANTENNAS is not affiliated with, sponsored by, or endorsed by these companies.

Feedback and Submissions

If you send us corrections, suggestions, or other feedback, you grant us a worldwide, royalty-free, perpetual, irrevocable licence to use, modify, and incorporate it into the Site without any obligation or payment to you. Please do not send confidential or proprietary information.

Third-Party Links, Services and Advertising

The Site may contain links to third-party websites, datasheets, and tools, and may display advertisements served by third-party networks. We do not control, endorse, or take responsibility for third-party content, products, services, or privacy practices. Your dealings with third parties, including advertisers, are solely between you and them. A mention of any product, material, or software on the Site is not an endorsement or a guarantee of its suitability.

Availability and Changes to the Site

The Site is provided free of charge. We may change, update, suspend, or discontinue any part of it, including any calculator, its equations, or its results, at any time and without notice. We do not guarantee that the Site will be available, uninterrupted, secure, or error-free, or that results will remain the same between versions. We are not liable for any unavailability or change.

Disclaimer of Warranties

The Site and all content, calculators, simulations, and results are provided "as is" and "as available", without warranty of any kind. To the fullest extent permitted by law, NEXT ANTENNAS disclaims all warranties, express, implied, or statutory, including any warranties of accuracy, completeness, reliability, merchantability, fitness for a particular purpose, title, and non-infringement, and any warranties arising from course of dealing or usage of trade. We do not warrant that any result is correct, that any design will perform as calculated, or that any design, installation, or device will be safe or compliant with any law, regulation, or standard.

Limitation of Liability

To the fullest extent permitted by law, in no event will NEXT ANTENNAS, its owners, contributors, or affiliates be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, or for any loss of profits, revenue, data, goodwill, or business opportunity, or for the cost of redesign, re-fabrication, re-testing, certification, recall, or substitute goods or services, arising out of or relating to the Site or your use of, or reliance on, any content, calculation, simulation, or result, whether based on contract, tort (including negligence), strict liability, or any other theory, even if we have been advised of the possibility of such damages.

To the fullest extent permitted by law, our total liability for all claims arising out of or relating to the Site or these Terms will not exceed fifty US dollars (US$50).

Some jurisdictions do not allow the exclusion or limitation of certain warranties or damages, so some of the above may not apply to you. Nothing in these Terms excludes or limits any liability that cannot be excluded or limited under applicable law, such as liability for fraud or, where applicable, for death or personal injury caused by negligence.

Indemnification

To the fullest extent permitted by law, you agree to defend, indemnify, and hold harmless NEXT ANTENNAS, its owners, contributors, and affiliates from and against any claims, liabilities, damages, losses, and expenses, including reasonable legal fees, arising out of or relating to: (a) your use of the Site; (b) any design, product, installation, or device you create, sell, or operate using content or results from the Site; (c) your violation of these Terms; or (d) your violation of any law or the rights of any third party.

Governing Law and Disputes

These Terms and any dispute arising out of or relating to them or to the Site are governed by the laws of the State of New York, United States, without regard to its conflict-of-law rules. You agree that any such dispute will be brought exclusively in the state or federal courts located in the State of New York, and you consent to the personal jurisdiction of those courts.

Before starting any formal proceeding, you agree to contact us at hello@nextantennas.com and try in good faith to resolve the dispute informally for at least 30 days. To the extent permitted by law, any claim must be brought within one (1) year after it arises, or it is permanently barred.

Privacy

Our Privacy Policy explains what information we collect and how we use it. All calculations and simulations run in your browser, and your inputs and results are not sent to our servers.

Changes to These Terms

We may update these Terms from time to time. When we do, we will revise the "Last updated" date at the top of this page. Changes take effect when posted. Your continued use of the Site after changes are posted means you accept the updated Terms, so please review this page periodically.

General Terms

• Entire agreement — these Terms and our Privacy Policy are the entire agreement between you and us about the Site.
• Severability — if any provision is found unenforceable, it will be enforced to the maximum extent permitted and the remaining provisions stay in full effect.
• No waiver — our failure to enforce any provision is not a waiver of our right to do so later.
• Assignment — you may not transfer your rights under these Terms. We may assign ours without restriction.
• Survival — Sections 4, 5, 8, 9, and 12 to 15 continue to apply after you stop using the Site.
• Headings — headings are for convenience only and do not affect interpretation.

Contact Us

If you have questions about these Terms, or want to report an error in a calculator or article, please contact us: