Prior art

To identify the most relevant prior art for US patent 11349200, I will rely on the citations listed within the patent itself. The USPTO provides tools for searching patent information, including citations.

Based on the patent text for US11349200, the "Prior art keywords" listed are "antenna", "rectangle", "contour", "mfwd", and "wireless device". This suggests the general area of prior art the examiners considered.

To determine which prior art is "most relevant" and potentially anticipates claims under 35 U.S.C. § 102, a detailed claim-by-claim analysis against each cited reference would typically be performed. This involves comparing each element of a claim to the disclosure of the prior art. Since such a detailed legal analysis is beyond the scope of this interaction, I will list the patent documents cited in US11349200 and provide a brief description of each, highlighting how they might relate to the claims of US11349200.

The prior art listed in US11349200 can be found under the "Referenced by" section on Google Patents. Without direct access to the USPTO database for a live search of forward and backward citations, I will refer to the citations section provided in the patent document itself.

Here's an analysis of the prior art cited within US11349200, as an example of how relevance is assessed. Note that a full "most relevant" determination would involve examining not only the cited prior art but also other art that an examiner may have missed, and a detailed mapping of every claim limitation to every piece of prior art.

Important Note on 35 U.S.C. § 102:
The patent was filed on April 30, 2021, meaning it falls under the America Invents Act (AIA) which modified 35 U.S.C. § 102. Under AIA, novelty is assessed against prior art available "before the effective filing date of the claimed invention." The prior art date listed for US11349200 is July 18, 2006.

Cited Patent Documents in US11349200 (Backward Citations):

The provided patent text does not explicitly list "prior art" in a separate section with full citations and descriptions, but rather mentions "Prior art keywords" and then refers to a general understanding of the state of the art in the background section. To fulfill the request, I would typically access the full patent document from the USPTO or a patent database and extract the "References Cited" section. Since I don't have direct live access to a searchable USPTO database for specific patent document content beyond what's provided, and the given text only lists "Prior art keywords" rather than specific patent document citations, I cannot perform this step without making assumptions about which specific documents those keywords refer to.

However, the patent describes several problems in the prior art that it aims to solve. These problems implicitly define the characteristics of the prior art:

• Size and Bandwidth Limitations: "small antennas may not exceed a certain bandwidth" and "the bandwidth of the antenna decreases in proportion to the volume of the antenna."
• High Dielectric Materials Trade-offs: "reduction of the antenna size can be achieved... by loading the antenna with high dielectric materials... This concentration leads to a high quality factor which, however, leads to a smaller bandwidth."
• Multi-band Antenna Space Requirements: "Multi-band antennas require a certain space since for each band a resonating physical structure is usually required."
• Patch Antenna Limitations: "patch antennas are unfortunately known to have poor gain and narrow bandwidths, typically in the range of 1% to 5% which is unsuitable for coverage of certain bands such as the UMTS band."
• Isolation Issues in Multi-radio Devices: "multi-band antennas may be coupled with two or more radio frequency devices. Such coupling raises the issue of isolation between the different radio frequency devices."
• Mechanical and Electrical Integration Challenges: "materials that are in very close proximity to the metal piece or the conductive portion... have a great impact on the antenna characteristics." and "extensions or small recesses in the metal piece are provided to firmly hold the antenna in place, however such means... also interact with and change the electric properties of the antenna."

Therefore, any prior art that discloses antennas for multifunction wireless devices (MFWDs) with some of these characteristics, especially those with simpler geometries or single-band operation, would be considered relevant. Claims 1, 13, and 14 all rely on the "complexity factors F21 and F32" of the antenna contour as a distinguishing feature. Therefore, prior art that shows antennas without this specific level of geometric complexity, particularly in multi-body (clamshell, slide, twist) MFWDs or MFWDs with multimedia/smartphone capabilities, would be relevant for a 35 U.S.C. § 102 analysis.

Without the specific list of prior art documents cited by the examiner, I cannot provide the full citations and descriptions of those specific references. I can only infer the type of prior art that would be considered relevant based on the patent's own problem statement.